Science of Brewing Archives - Brookston Beer Bulletin

Historic Beer Birthday: Emil Christian Hansen

May 8, 2022 By Jay Brooks Leave a Comment

Today is the birthday of Emil Christian Hansen (May 8, 1842-August 27, 1909). Hansen was a “Danish botanist who revolutionized beer-making through development of new ways to culture yeast. Born poor in Ribe, Denmark, he financed his education by writing novels. Though he never reached an M.Sc., in 1876, he received a gold medal for an essay on fungi, entitled “De danske Gjødningssvampe.” In 1879, he became superintendent of the Carlsberg breweries. In 1883, he successfully developed a cultivated yeast that revolutionized beer-making around the world, because Hansen by refusing to patent his method made it freely available to other brewers. He also proved there are different species of yeast. Hansen separated two species: Saccharomyces cerevisiae, an over-yeast (floating on the surface of the fermenting beer) and Saccharomyces carlsbergensis, an under-yeast (laying on the bottom of the liquid).

Here’s his entry from Encyclopedia Britannica:

Danish botanist who revolutionized the brewing industry by his discovery of a new method of cultivating pure strains of yeast.

Hansen, who began his working life as a journeyman house painter, received a Ph.D. in 1877 from the University of Copenhagen. Two years later he was appointed head of the physiology department at the Carlsberg Laboratory in Copenhagen, where he remained until his death. His research was concerned mainly with yeasts that convert carbohydrates to alcohol, and in 1888 he published an article that described his method for obtaining pure cultures of yeast. The yeast grown from these single strains was widely adopted in the bottom-fermentation brewing industries. Further investigations led him to the discovery of a number of species of yeast. He defined the characters of the different species and devised a system of classification. After further study he devised additional methods for the culture and isolation of certain species.

Emil Hansen as a young man.

This is how Carlsberg describes Hansen’s breakthrough in 1883:

The Carlsberg Laboratory made its first major scientific breakthrough when Dr. Emil Chr. Hansen developed a method for propagating pure yeast.

Fluctuations in the beer quality were not unknown at the time, but had until then been solved by thorough cleaning of all installations after suspension of production. If a brew failed, there was no use in pasteurising it; it had to be destroyed.

In 1883, the Old Carlsberg beer got infected with the beer disease and all efforts were made to find a solution to the problem.

Dr. Emil Chr. Hansen who joined the Carlsberg Laboratory in 1878 was examining the beer, and he found that it contained wild yeast. Through his studies and analyses, he discovered that only a few types of yeast (the pure yeast) are suitable for brewing, and he developed a technique to separate the pure yeast from the wild yeast cells. The problem had been solved, and the new Carlsberg yeast – Saccharomyces Carlsbergensis – was applied in the brewing process.

The propagating method revolutionised the brewing industry. Rather than to patent the process, Carlsberg published it with a detailed explanation so that anyone could build propagation equipment and use the method. Samples of the yeast – Saccharomyces Carlsbergensis – were sent to breweries around the world by request and young brewers came to Carlsberg to learn the skills.

This is the entry from Wikipedia on the history of Saccharomyces Carlsbergensis:

So-called bottom fermenting strains of brewing yeast were described as early as the 14th century in Nuremberg and have remained an indispensable part of both Franconian and Bavarian brewing culture in southern Germany through modern times. During the explosion of scientific mycological studies in the 19th century, the yeast responsible for producing these so-called “bottom fermentations” was finally given a taxonomical classification, Saccharomyces pastorianus, by the German Max Reess in 1870.

In 1883 the Dane Emil Hansen published the findings of his research at the Carlsberg brewery in Copenhagen and described the isolation of a favourable pure yeast culture that he labeled “Unterhefe Nr. I” (bottom-fermenting yeast no. 1), a culture that he identified as identical to the sample originally donated to Carlsberg in 1845 by the Spaten Brewery of Munich. This yeast soon went into industrial production in Copenhagen in 1884 as Carlberg yeast no. 1.

In 1904 Hansen published an important body of work where he reclassified the separate yeasts he worked with in terms of species, rather than as races or strains of the same species as he had previously done. Here Hansen classified a separate species of yeast isolated from the Carlsberg brewery as S. pastorianus, a name derived from and attributed to Reess 1870. This strain was admitted to the Centraalbureau voor Schimmelcultures (CBS) in 1935 as strain CBS 1538, Saccharomyces pastorianus Reess ex Hansen 1904. In a further publication in 1908, Hansen reclassified the original “Unterhefe Nr. I” as the new species Saccharomyces carlsbergensis and another yeast “Unterhefe Nr. II” as the new species Saccharomyces monacensis. The taxonomy was attributed to Hansen 1908 and the yeasts entered into the Centraalbureau voor Schimmelcultures in 1947 as CBS 1513 and CBS 1503 respectively.

Since the early 1900s, bottom-fermenting strains of brewery yeast have been typically classified as S. carlbergensis in scientific literature, and the earlier valid name assigned to a bottom-fermenting yeast by Reess in 1870 was rejected without merit. This situation was rectified using DNA-DNA reallocation techniques in 1985 when Vaughan-Martini & Kurtzman returned the species name to S. pastorianus under the type strain CBS 1538 and relegated the two former species assigned by Hansen in 1908, S. carlsbergensis CBS 1513 and S. monacensis CBS 1503, to the status of synonyms. These experiments also clearly revealed the hybrid nature of the lager brewing yeast species for the first time, even though one of the parental species was incorrectly classified in retrospect. Nonetheless, over the last decades of the 20th century, debate continued in scientific literature regarding the correct taxon, with authors using both names interchangeably to describe lager yeast.

Although most accounts mention that he wrote novels to put himself through school, one has a slightly different take, though I’m not sure how true it is. “Emil earned his bread and butter as a painter but he yearned for another life and left Ribe so he could study. He graduated from High School relatively late – he was 29 years old.”

Emil Christian Hansen, taken in 1908, a year before his death.

Historic Beer Birthday: William Cullen

April 15, 2022 By Jay Brooks Leave a Comment

Today is the birthday of William Cullen (April 15, 1710-February 5, 1790). He “was a Scottish physician, chemist and agriculturalist, and one of the most important professors at the Edinburgh Medical School, during its hay-day as the leading center of medical education in the English-speaking world.

Cullen was also a central figure in the Scottish Enlightenment. He was David Hume’s physician and friend, and on intimate terms with Adam Smith, Lord Kames (with whom he discussed theoretical and practical aspects of husbandry), Joseph Black, John Millar, and Adam Ferguson, among others.

He was President of the Royal College of Physicians and Surgeons of Glasgow (1746–47), President of the Royal College of Physicians of Edinburgh (1773–1775) and First Physician to the King in Scotland (1773–1790). He was also, incidentally, one of the prime movers in obtaining a royal charter for the Philosophical Society of Edinburgh, resulting in the formation of the Royal Society of Edinburgh in 1783.”

Cullen extended the subject of chemistry beyond medicine by connecting it to many “arts” including agriculture, bleaching, brewing, mining, and the manufacture of vinegar and alkalies. In brewing, it was the very important need for cooling using artificial refrigeration where William Cullen at the University of Glasgow in 1748 made his impact, making advances crucial to the development of refrigeration for the brewing industry when he began studying the cooling effects of liquids evaporating in a vacuum, the process by which we cool foods today. He even demonstrated artificial refrigeration for the first time in 1748.

In the Brussels Journal, in a multi-part history of beer, Cullen’s contributions are acknowledged and explained:

The principle of vacuum refrigerators is based on the fact that water in a sealed container can be made to boil if the pressure is reduced (the “boiling point” of 100 degrees Celsius refers to the situation when the external pressure equals one atmosphere; water can be made to boil at lower temperatures on a mountain top). The heat necessary for evaporation is taken from the water itself. Reducing the pressure further lowers the temperature until freezing-point is reached and ice is formed. The Scottish scholar and chemist William Cullen (1710-1790) gave one of the first documented public demonstrations of artificial refrigeration, and the United States inventor Oliver Evans (1755-1819) designed, but did not build, a refrigeration machine which ran on vapor in 1805. I. Hornsey writes in his history of beer and brewing:

“The earliest machine of this type was constructed in 1755, by Dr William Cullen, who produced the vacuum necessary purely by means of a pump. Then, in 1810, Sir John Leslie combined a vessel containing a strong sulphuric acid solution along with the air pump, the acid acting as an absorbent for water vapour in the air. This principle was taken up and elaborated upon by E.C. Carré, who in 1860 invented a machine that used ammonia as the volatile liquid instead of water….The first compression machine was manufactured by John Hague in 1834, from designs by the inventor, Jacob Perkins, who took out the original patents, and recommended that ether was used as the volatile agent. Although Hague’s machine can be regarded as the archetype for all ‘modern’ refrigerators, it never really got past the development stage, and it was left to the Australian, James Harrison, of Geelong, Victoria, to finalise the practicalities and produce a working version, which he did in 1856. By 1859, Harrison’s equipment was being manufactured commercially in New South Wales, and the first of them (which used ether as the refrigerating agent) came to Britain in 1861.”

Although the first inventor of a practical refrigerator was Oliver Evans in 1805, Cullen invented the process in 1748 which allowed the technology to be further developed. After his public demonstration of the refrigeration effects of evaporative cooling, he described the phenomenon in “Of the Cold Produced by Evaporating Fluids and of Some Other Means of Producing Cold” (Essays and Observations, Physical and Literary, vol. 2 [1756]).

Historic Beer Birthday: Joseph Priestley

March 13, 2022 By Jay Brooks Leave a Comment

Today is the birthday of English scientist Joseph Priestley (March 13, 1733-February 6, 1804). While he was also a “clergyman, natural philosopher, chemist, educator, and Liberal political theorist,” he’s perhaps best known for discovering oxygen (even though a few others lay claim to that honor). According to Wikipedia, “his early scientific interest was electricity, but he is remembered for his later work in chemistry, especially gases. He investigated the ‘fixed air’ (carbon dioxide) found in a layer above the liquid in beer brewery fermentation vats. Although known by different names at the time, he also discovered sulphur dioxide, ammonia, nitrogen oxides, carbon monoxide and silicon fluoride. Priestley is remembered for his invention of a way of making soda-water (1772), the pneumatic trough, and recognising that green plants in light released oxygen. His political opinions and support of the French Revolution, were unpopular. After his home and laboratory were set afire (1791), he sailed for America, arriving at New York on 4 Jun 1794

In the biography of Priestley at the American Chemistry Society has a sidebar about his work with fermentation:

Bubbling Beverages

In 1767, Priestley was offered a ministry in Leeds, Englane, located near a brewery. This abundant and convenient source of “fixed air” — what we now know as carbon dioxide — from fermentation sparked his lifetime investigation into the chemistry of gases. He found a way to produce artificially what occurred naturally in beer and champagne: water containing the effervescence of carbon dioxide. The method earned the Royal Society’s coveted Copley Prize and was the precursor of the modern soft-drink industry.

Even Michael Jackson, in 1994, wrote about Priestley connection to the brewing industry.

“It has been suggested that the Yorkshire square system was developed with the help of Joseph Priestley who, in 1722, delivered a paper to the Royal Society on the absorption of gases in liquids. In addition to being a scientist, and later a political dissident, he was for a time the minister of a Unitarian church in Leeds. During that period he lived next to a brewery on a site that is now Tetley’s.”

In the New World Encyclopedia, during his time in Leeds, it explains his work on carbonation.

Priestley’s house was next to a brewery, and he became fascinated with the layer of dense gas that hung over the giant vats of fermenting beer. His first experiments showed that the gas would extinguish lighted wood chips. He then noticed that the gas appeared to be heavier than normal air, as it remained in the vats and did not mix with the air in the room. The distinctive gas, which Priestley called “fixed air,” had already been discovered and named “mephitic air” by Joseph Black. It was, in fact, carbon dioxide. Priestley discovered a method of impregnating water with the carbon dioxide by placing a bowl of water above a vat of fermenting beer. The carbon dioxide soon became dissolved in the water to produce soda water, and Priestley found that the impregnated water developed a pleasant acidic taste. In 1773, he published an article on the carbonation of water (soda water), which won him the Royal Society’s Copley Medal and brought much attention to his scientific work.

He began to offer the treated water to friends as a refreshing drink. In 1772, Priestley published a paper entitled Impregnating Water with Fixed Air, in which he described a process of dripping sulfuric acid (or oil of vitriol as Priestley knew it) onto chalk to produce carbon dioxide and forcing the gas to dissolve by agitating a bowl of water in contact with the gas.

And here’s More About Priestley from the Birmingham Jewellry Quarter, whatever that is:

But his most important work was to be in the field of gases, which he called ‘airs’ (he would later chide James Keir for giving himself airs (oh dear!) by adopting the term ‘gases’ in his Dictionary of Chemistry, saying ‘I cannot help smiling at his new phraseology’). Living, as he did at the time, next to a brewery, he noticed that the gas given off from the fermenting vats drifted to the ground, implying that it was heavier than air. Moreover, he discovered that it extinguished lighted wood chips. He had discovered carbon dioxide, which he called ‘fixed air’. Devising a method of making the gas at home without brewing beer, he discovered that it produced a pleasant tangy taste when dissolved in water. By this invention of carbonated water, he had become the father of fizzy drinks!

But perhaps my favorite retelling comes from the riveting History of Industrial Gases:

The relevant findings were published in 1772, in Impregnating Water with Fixed Air

20. By this process may fixed air be given to wine, beer, and almost any liquor whatever: and when beer is become flat or dead, it will be revived by this means; but the delicate agreeable flavour, or acidulous taste communicated by the fixed air, and which is manifest in water, will hardly be perceived in wine, or other liquors which have much taste of their own.

Priestley’s apparatus for experimenting with ‘airs.’

Historic Beer Birthday: Gottlieb Sigismund Kirchhof

February 19, 2022 By Jay Brooks Leave a Comment

Today is the birthday of Gottlieb Sigismund Kirchhof (February 19, 1764-February 14, 1833). He was born in Teterow, Mecklenburg-Schwerin, but spent most of his life in St. Petersburg, Russia, and considered himself to be Russian. Trained as a pharmacist and a chemist, and “in 1812 he became the first person to convert starch into a sugar, by heating it with sulfuric acid. This sugar was eventually named glucose. He also worked out a method of refining vegetable oil, and established a factory that prepared two tons of refined oil a day. Since the sulfonic acid was not consumed, it was an early example of a catalyst.” In other research, “he provided the groundwork for scientific study of the brewing and fermentation processes.”

Here’s a biography from Encyclopedia.com.

Kirchhof’s father, Johann Christof Kirchhof, owned a pharmacy until 1783 and at the same time was a postmaster. His mother, the former Magdalena Windelbandt, was the daughter of a tin smelter.

In his youth Kirchhof helped his father run the pharmacy; after the latter’s death in 1785 he worked in various pharmacies in the duchy of Mecklenburg-Schwerin, qualifying as a journeyman apothecary. In 1792 he moved to Russia and worked in the same capacity at the St. Petersburg Chief Prescriptional Pharmacy. From 1805 he was a pharmacist and became a member of the Fizikat Medical Council, a scientific and administrative group that supervised the checking of the quality of medicaments and certain imported goods. Kirchhof began his chemical studies under Tobias Lowitz, the manager of the pharmacy, and A. A. Musin-Pushkin. A few of his works were undertaken jointly with A. N. Scherer, and all of his scientific activity was carried out in Russia. In 1805 he was elected a corresponding member, in 1809 an adjunct, and in 1812 an academician adjunct of the St. Petersburg Academy of Sciences. In 1801 Kirchhof was elected a member of the Mecklenburg Natural Science Society, in 1806 a member of the Russian Independent Economical Society, in 1812 a member of the Boston Academy of Sciences, in 1815 a member of the vienna Economical Society, and in 1816 a member of the Padua Academy of Sciences.

Kirchhof’s first major discovery was the decomposition of barite with water, which Lowitz reported in “Vermischte chemische Bemerkungen” (Chemische Annalen [1797], 179-181), explicitly mentioning the discoverer. Klaproth had discovered this reaction much earlier. In 1797 Kirchhof reported two important results: the bleaching of shellac, which had an appreciable significance for the production of sealing wax, and a wet process that made it possible to begin industrial production of cinnabar. Cinnabar was produced of such high quality that it supplanted imported cinnabar, and some was exported. In 1805 Kirchhof developed a method for refining “heavy earth” (barite) by allowing caustic potash to react with barium salts. In 1807 he entered a competition organized by the Independent Economical Society to develop a method for refining vegetable oil. In collaboration with Alexander Crichton he worked out the sulfuric acid method of refining oil and received a prize of 1,000 rubles. The two men founded an oil purifying plant in St. Petersburg on Aptekarskiy Island, the largest factory at that time, with an output of about 4,400 pounds of oil per day. In many respects (for example, in the method of adding acid and the clarification of oil by glue) Kirchhof’s method is closer to modern methods than that of Thénard (1801).

In 1809 Kirchhof resigned from the Chief Prescriptional Pharmacy but continued to carry out the assignments of the Fizikat Medical Council in his laboratory there; he also conducted investigations in his home laboratory. During this period he began prolonged research to find a method for producing gum from starch in order to supplant the imported products; he then began investigating the optimal conditions for obtaining sugar from starch.

Kirchhof studied the action of mineral and organic acids (sulfuric, hydrochloric, nitric, oxalic and so on) on starch and found that these acids inhibit the jelling of starch and promote the formation of sugar from starch. He also studied the effect of acids on the starches of potatoes, wheat, rye, and corn as well as the effect of acid concentration and temperature on the rate of hydrolysis. At the same time he was searching for new raw materials for producing sugar by the hydrolysis of starch. In 1811 Kirchhof presented to the St. Petersburg Academy of Sciences the samples of sugar and sugare syrup obtained by hydrolysis of starch in dilute acid solutions. He advanced a technological method for producing sugar that was based on his investigations published in 1812. Best results were obtained by adding 1.5 pounds of sulfuric acid in 400 parts of water to 100 pounds of starch. The duration of reaction was between twenty-four and twenty-five hours at 90-100° C. The bulk of the acid did not enter into the reaction with starch, because after completion of the reaction, Kirchhof neutralized it with a specific amount of chalk. This was the first controlled catalytic reaction.

In 1814 Kirchhof submitted to the Academy of Sciences his report “Über die Zucker bildung beim Malzen des Gestreides und beim Bebrühen seines Mehl mit kochendem Wasser,” which was published the following year in Schweigger’s Journal für Chemie und Physik. This report describes the biocatalytic (amylase) action, discovered by Kirchhof, of gluten and of malt in saccharifying starch in the presence of these agents. He showed that gluten induces saccharification of starch even at 40-60° C. in eight to ten hours. During the first hour or two the starch paste was converted into liquid, which after filtration became as transparent as water. Mashed dry barley malt saccharified the starch at 30° R. in one hour. Similarly, Kirchhof studied the starch contained in the malt, separating starch from gluten by digesting it with a 3 percent aqueous solution of caustic potash. The starch treated in this manner could not be converted into sugar. Thus he proved that malt gluten is the starting point for the formation of sugar, while starch is the source of sugar.

The catalytic enzyme hydrolysis of starch discovered by Kirchhof laid the foundation for the scientific study of brewing and distilling and resulted in the creation of the theory of the formation of alcohol.

In his last years of scientific activity Kirchhof developed a method of producing unglazed pottery by treating it with drying oils; a method to refine chervets (a substitute for cochineal) from oily substances; and a method for rendering wood, linen, paper, and other substances nonflammable. For refining chervets he suggested the regeneration of turpentine by mixing it with water and then distilling the mixture.

Kirchhof also conducted research assigned by the Academy of Sciences, including analysis of gun-powders, William Congreve’s rocket fuel, mineral samples, and mineral and organic substances.

And here’s a more thorough explanation of what he discovered, and how it applied to brewing beer, from Science Clarified:

A Brief History of Catalysis

Long before chemists recognized the existence of catalysts, ordinary people had been using the process of catalysis for a number of purposes: making soap, for instance, or fermenting wine to create vinegar, or leavening bread. Early in the nineteenth century, chemists began to take note of this phenomenon.

In 1812, Russian chemist Gottlieb Kirchhof was studying the conversion of starches to sugar in the presence of strong acids when he noticed something interesting. When a suspension of starch in water was boiled, Kirchhof observed, no change occurred in the starch. However, when he added a few drops of concentrated acid before boiling the suspension (that is, particles of starch suspended in water), he obtained a very different result. This time, the starch broke down to form glucose, a simple sugar, while the acid—which clearly had facilitated the reaction—underwent no change.

Around the same time, English chemist Sir Humphry Davy (1778-1829) noticed that in certain organic reactions, platinum acted to speed along the reaction without undergoing any change. Later on, Davy’s star pupil, the great British physicist and chemist Michael Faraday (1791-1867), demonstrated the ability of platinum to recombine hydrogen and oxygen that had been separated by the electrolysis of water. The catalytic properties of platinum later found application in catalytic converters, as we shall see.

AN IMPROVED DEFINITION

In 1835, Swedish chemist Jons Berzelius (1779-1848) provided a name to the process Kirchhof and Davy had observed from very different perspectives: catalysis, derived from the Greek words kata (“down”) and lyein (“loosen.”) As Berzelius defined it, catalysis involved an activity quite different from that of an ordinary chemical reaction. Catalysis induced decomposition in substances, resulting in the formation of new compounds—but without the catalyst itself actually entering the compound.

Berzelius’s definition assumed that a catalyst manages to do what it does without changing at all. This was perfectly adequate for describing heterogeneous catalysis, in which the catalyst and the reactants are in different phases of matter. In the platinum-catalyzed reactions that Davy and Faraday observed, for instance, the platinum is a solid, while the reaction itself takes place in a gaseous or liquid state. However, homogeneous catalysis, in which catalyst and reactants are in the same state, required a different explanation, which English chemist Alexander William Williamson (1824-1904) provided in an 1852 study.

In discussing the reaction observed by Kirchhof, of liquid sulfuric acid with starch in an aqueous solution, Williamson was able to show that the catalyst does break down in the course of the reaction. As the reaction takes place, it forms an intermediate compound, but this too is broken down before the reaction ends. The catalyst thus emerges in the same form it had at the beginning of the reaction.

Enzymes: Helpful Catalysts in the Body

In 1833, French physiologist Anselme Payen (1795-1871) isolated a material from malt that accelerated the conversion of starch to sugar, as for instance in the brewing of beer. Payen gave the name “diastase” to this substance, and in 1857, the renowned French chemist Louis Pasteur (1822-1895) suggested that lactic acid fermentation is caused by a living organism.

In fact, the catalysts studied by Pasteur are not themselves separate organisms, as German biochemist Eduard Buchner (1860-1917) showed in 1897. Buchner isolated the catalysts that bring about the fermentation of alcohol from living yeast cells—what Payen had called “diastase,” and Pasteur “ferments.” Buchner demonstrated that these are actually chemical substances, not organisms. By that time, German physiologist Willy Kahne had suggested the name “enzyme” for these catalysts in living systems.

Enzymes are made up of amino acids, which in turn are constructed from organic compounds called proteins. About 20 amino acids make up the building blocks of the many thousands of known enzymes. The beauty of an enzyme is that it speeds up complex, life-sustaining reactions in the human body—reactions that would be too slow at ordinary body temperatures. Rather than force the body to undergo harmful increases in temperature, the enzyme facilitates the reaction by opening up a different reaction pathway that allows a lower activation energy.

One example of an enzyme is cytochrome, which aids the respiratory system by catalyzing the combination of oxygen with hydrogen within the cells. Other enzymes facilitate the conversion of food to energy, and make possible a variety of other necessary biological functions.

Because numerous interactions are required in their work of catalysis, enzymes are very large, and may have atomic mass figures as high as 1 million amu. However, it should be noted that reactions are catalyzed at very specific locations—called active sites—on an enzyme. The reactant molecule fits neatly into the active site on the enzyme, much like a key fitting in a lock; hence the name of this theory, the “lock-and-model.”

Historic Beer Birthday: Morton Coutts

February 7, 2022 By Jay Brooks Leave a Comment

Today is the birthday of Morton W. Coutts (February 7, 1904-June 25, 2004) who was a “New Zealand inventor who revolutionized the science of brewing beer,” and “is best known for the continuous fermentation method.”

Here’s a basic biography from the DB Breweries website:

Morton Coutts (1904-2004) was the inheritor of a rich brewing tradition dating back to the 19th century. Like his father, W. Joseph Coutts and grandfather, Joseph Friedrich Kühtze, Morton Coutts was more an innovator and scientific brewer than a businessman. He was foundation head brewer of Dominion Breweries Ltd under (Sir) Henry Kelliher and became a director of the company after his father’s death in 1946. He and Kelliher formed a formidable team-Coutts, the boffin-like heir to a rich brewing heritage, obsessed with quality control and production innovation, and Kelliher, a confident, entrepreneurial businessman, able to hold his own with politicians and competitors.

Morton Coutts’ most important contribution was the development in the 1950s of the system of continuous fermentation, patented in 1956, to give greater beer consistency and product control. The continuous fermentation process was so named because it allows a continuous flow of ingredients in the brewing, eliminating variables to produce the ideal beer continuously. The system achieved this by scrapping open vats-the weak link in the old system-and replacing them with enclosed sealed tanks. Continuous fermentation allows the brew to flow from tank to tank, fermenting under pressure, and never coming into contact with the atmosphere, even when bottled. Coutts’ research showed that his process could produce consistent, more palatable beer with a longer shelf life than under batch brewing. A London newspaper described it as a “brewer’s dream and yours too”. Coutts patented the process, and subsequently the patent rights were sold worldwide as other brewers recognised the inherent benefits of continuous processes. Although many attempted to implement the technology, most failed due to their inability to apply the rigorous hygiene techniques developed and applied by Coutts. Eventually, in 1983, Coutts’ contribution to the industry was honoured in New Zealand.

And DB Breweries also has a timeline with key events in the brewery’s history, including dates from Coutts’ life.

The Waitemata Brewery in 1933, after it became part of DB Breweries.

As for his most influential invention, continuous fermentation, here are some resources, one from New Zealand’s Science Trust Roadshow with Morton Coutts — Continuous Fermentation System. And after I visited New Zealand, I wrote a sidebar on it for an article I did for All About Beer, and also later when a German university announced something very similar a few years ago in Everything Old Is New Again: Non-Stop Fermentation.

MortonCouttsNZBeerinnovatorchangedglobalprocesses

Coutts later in life.Also, here’s the story of him creating DB Export The Untold Story, featuring this fun video.

Historic Beer Birthday: Louis Camille Maillard

February 4, 2022 By Jay Brooks Leave a Comment

Today is the birthday of French physician and chemist Louis Camille Maillard (February 4, 1878-May 12, 1936) who was the Doogie Howser of his era, joining the faculty of the University of Nancy when he was only sixteen. He rose to prominence thanks to his work on kidney disorders and later taught medicine at the prestigious University of Paris.

But his biggest contribution, especially to brewing, was an accidental discovery he made in 1912, which today we call the Maillard Reaction, or Browning Reaction.

Here’s the basic description, from Wikipedia:

The Maillard Reaction a chemical reaction between amino acids and reducing sugars that gives browned food its desirable flavor. Seared steaks, pan-fried dumplings, biscuits (widely known in North America as cookies), breads, toasted marshmallows, and many other foods undergo this reaction. It is named after French chemist Louis-Camille Maillard, who first described it in 1912 while attempting to reproduce biological protein synthesis.

The reaction is a form of non-enzymatic browning which typically proceeds rapidly from around 140 to 165 °C (284 to 329 °F). At higher temperatures, caramelization and subsequently pyrolysis become more pronounced.

The reactive carbonyl group of the sugar reacts with the nucleophilic amino group of the amino acid, and forms a complex mixture of poorly characterized molecules responsible for a range of odors and flavors. This process is accelerated in an alkaline environment (e.g., lye applied to darken pretzels), as the amino groups (RNH3+) are deprotonated and, hence, have an increased nucleophilicity. The type of the amino acid determines the resulting flavor. This reaction is the basis of the flavoring industry. At high temperatures, a potential carcinogen called acrylamide can be formed.

In the process, hundreds of different flavor compounds are created. These compounds, in turn, break down to form yet more new flavor compounds, and so on. Each type of food has a very distinctive set of flavor compounds that are formed during the Maillard reaction. It is these same compounds that flavor scientists have used over the years to make reaction flavors.

It was, and is, for food science and understanding how heat and cooking create flavors. If you want to dive deeper, the Warwick Medical School has an article on the Historical Development of the reaction, and NPR’s Food for Thought on the centenary of Malliard’s discovery posted 100 Years Ago, Maillard Taught Us Why Our Food Tastes Better Cooked.

But it was also very important to brewing, too, especially when it comes to malting and roasting malt to get different flavors and colors in the beer. For example, here’s UC Davis professor Charlie Bamforth writing about the Malliard Reaction in his book Grape vs. Grain.

Not surprisingly, John Mallett, in his recent book Malt: A Practical Guide from Field to Brewhouse, mentions Malliard’s contributions to brewing science.

The chemistry website Compound Interest has a good explanation with their post, Food Chemistry – The Maillard Reaction.

And finally, Popular Science’s BeerSci series discusses the Maillard Reaction in How Beer Gets Its Color.

Historic Beer Birthday: James Watt

January 19, 2022 By Jay Brooks Leave a Comment

Today is the birthday of James Watt, not the BrewDog co-founder, but the “Scottish inventor, mechanical engineer, and chemist who improved on Thomas Newcomen’s 1712 Newcomen steam engine with his Watt steam engine in 1781, which was fundamental to the changes brought by the Industrial Revolution in both his native Great Britain and the rest of the world.

While working as an instrument maker at the University of Glasgow, Watt became interested in the technology of steam engines. He realised that contemporary engine designs wasted a great deal of energy by repeatedly cooling and reheating the cylinder. Watt introduced a design enhancement, the separate condenser, which avoided this waste of energy and radically improved the power, efficiency, and cost-effectiveness of steam engines. Eventually he adapted his engine to produce rotary motion, greatly broadening its use beyond pumping water.

Watt attempted to commercialise his invention, but experienced great financial difficulties until he entered a partnership with Matthew Boulton in 1775. The new firm of Boulton and Watt was eventually highly successful and Watt became a wealthy man. In his retirement, Watt continued to develop new inventions though none was as significant as his steam engine work. He died in 1819 aged 83.

He developed the concept of horsepower, and the SI unit of power, the watt, was named after him.”

A portrait of James Watt, by Carl Frederik von Breda, completed in 1792.

Of course, from our perspective his most important contribution was to the industrial revolution, and specifically the improvement of brewery efficiency. While Watt did not invent the steam engine, his improvements made it practical, especially in breweries.

The Watt Steam Engine

The Watt steam engine (alternatively known as the Boulton and Watt steam engine) was the first type of steam engine to make use of a separate condenser. It was a vacuum or “atmospheric” engine using steam at a pressure just above atmospheric to create a partial vacuum beneath the piston. The difference between atmospheric pressure above the piston and the partial vacuum below drove the piston down the cylinder. James Watt avoided the use of high pressure steam because of safety concerns. Watt’s design became synonymous with steam engines, due in no small part to his business partner, Matthew Boulton.

The Watt steam engine, developed sporadically from 1763 to 1775, was an improvement on the design of the Newcomen engine and was a key point in the Industrial Revolution.

Watt’s two most important improvements were the separate condenser and rotary motion. The separate condenser, located external to the cylinder, condensed steam without cooling the piston and cylinder walls as did the internal spray in Newcomen’s engine. Watt’s engine’s efficiency was more than double that of the Newcomen engine. Rotary motion was more suitable for industrial power than the oscillating beam of Newcomen’s engine.

Watt’s most famous steam engine was the one installed at the Whitbread Brewery in 1785, which was known as the Whitbread Engine. Today it’s located in the Powerhouse Museum in Sydney, Australia.

The Whitbread Engine

The Whitbread Engine preserved in the Powerhouse Museum in Sydney, Australia, built in 1785, is one of the first rotative steam engines ever built, and is the oldest surviving. A rotative engine is a type of beam engine where the reciprocating motion of the beam is converted to rotary motion, producing a continuous power source suitable for driving machinery.

This engine was designed by the mechanical engineer James Watt, manufactured for the firm Boulton and Watt and originally installed in the Whitbread brewery in London, England. On decommissioning in 1887 it was sent to Australia’s Powerhouse Museum (then known as the Technological, Industrial and Sanitary Museum) and has since been restored to full working order.

Installation of the Watt Steam Engine at Whitbread.

History of the Whitbread Engine

The engine was ordered by Samuel Whitbread in 1784 to replace a horse wheel at the Chiswell Street premises of his London brewery. It was installed in 1785, the second steam engine to be installed in a brewery, and enabled Whitbread to become the largest brewer in Britain. The horse wheel was retained for many years, serving as a backup in case the steam engine broke down. The drive gear of the engine, still evident today, was connected to a series of wooden line shafts which drove machinery within the brewery. Connected machinery included rollers to crush malt; an Archimedes’ screw, that lifted the crushed malt into a hopper; a hoist, for lifting items into the building; a three-piston pump, for pumping beer; and a stirrer within a vat. There was also a reciprocating pump connected to the engine’s beam, used to pump water from a well to a tank on the roof of the brewery.

In a marketing coup for both the brewer and the engine’s manufacturer, King George III and Queen Charlotte visited the brewery on 24 May 1787. The engine remained in service for 102 years, until 1887.

The engine made its way to the Powerhouse Museum (then known as the Technological, Industrial and Sanitary Museum) through Archibald Liversidge, an English-born chemist, scientist and academic at the University of Sydney, who was a trustee of the museum. Liversidge was in London in 1887, at the time of the engine’s decommissioning, and when he heard that the engine was to be scrapped he asked whether it could be donated to the museum. Whitbread & Co agreed on condition that the engine be set up and used for educational purposes.

Subsequently, the engine was dismantled and shipped to Sydney on the sailing ship Patriarch. For shipping purposes, the large flywheel was divided into two halves. While the flywheel’s rim could be unbolted, the hub with attached spokes had to be drilled through and rejoined after shipping. A shortage of funds meant the engine was kept in storage for several years. Eventually the engine was erected in its own engine house, behind the main building at the museum’s old Harris Street premises. During the 1920s or 1930s, an electric motor was added so that people could see the engine in motion. During the 1980s the Technology Restoration Society was formed in order to raise funds for the engine’s restoration. Restoration took place at the Museum’s Castle Hill site. During the restoration, some parts – including the piston – were replaced to preserve the original parts. The engine, restored to steaming condition, was installed in the new Powerhouse Museum in 1988. Today the engine is sometimes operated as part of the Museum’s Steam Revolution exhibition, steam being provided by the Museum’s central boiler.

Technical specifications

The engine has a 0.64 metres (25 in) diameter piston with a 1.8 metres (6 ft) long stroke, driven by a mean effective pressure of 70 kilopascals (10 psi). Its top speed is 20 revolutions per minute (rpm) of the flywheel. In the engine’s youth, it had a maximum power output of approximately 26 kilowatts (35 hp).[It underwent a series of alterations in 1795, converting it from single-acting to double-acting; it was alleged at the time that this conversion improved its power to 52 kilowatts (70 hp), but the Powerhouse Museum claims this is false. A centrifugal governor, which moderates the level of steam provided if the engine begins to overload was added some years after this, and beam and main driving rod, both originally of wood, were replaced in sand-cast iron.

Apart from its age, the engine is notable in that it embodies the four innovations which made Boulton & Watt’s engines a significant driver of the Industrial Revolution. The first is a separate condenser, which increases the efficiency of the engine by allowing the main cylinder to remain hot at all times. The second is the parallel motion, which converts the up-and-down motion of the piston into the arcing motion of the beam, whilst maintaining a rigid connection. The rigid connection allowed the engine to be double-acting, meaning the piston could push as well as pull the beam. Third is the centrifugal governor, used to automatically regulate the speed of the engine. Finally the sun and planet gear convert the reciprocating motion of the beam into a rotating motion, which can be used to drive rotating machinery.

There’s also another Boulton & Watt engine at the National Museum of Scotland. It “was built in 1786 to pump water for the Barclay & Perkins Brewery in Southwark, London. Made double-acting in 1796, it was then capable of grinding barley and pumping water. At that time, no one else could supply a steam engine that performed both these actions at once. With some minor modifications, it remained in service at the brewery until 1884.”

And this is more from the National Museum of Scotland:

James Watt (1736-1819) was a prolific inventor, surveyor, instrument maker and engineer. His engines dramatically increased the power that could be generated through steam.

By entering into partnership with the Birmingham magnate Matthew Boulton in 1774, James Watt was able to channel the vast resource of Boulton’s Soho Foundry. Their partnership was so successful that the Boulton & Watt firm supplied engines and expertise to countries as far a field as Russia and Greece.

After pumping water and grinding barley for almost eighty-seven years, the engine came out of service in 1883.

You can see a diagram of the engine in action here:

Watt’s Steam Engine

Inside the Engine

Lighting the Fire

Running the Engine

If you want to read more in-depth about Watt’s development of the steam engine, Chapter III of “The Development of the Modern Steam-Engine: James Watt and His Contemporaries” is online, and there’s also various links at Watt’s page at the Scottish Engineering Hall of Fame.

Historic Beer Birthday: Michael Joseph Owens

January 1, 2022 By Jay Brooks Leave a Comment

Today is the birthday of Michael Joseph Owens (January 1, 1859–December 27, 1923). He “was an inventor of machines that could automate the production of glass bottles.”

If you’ve ever opened a beer bottle, you’ve probably held something he had a hand in developing, because he made beer bottles cheap and affordable for breweries, and his company has continued to improve upon his designs. Based on his patents, in 1903 he founded the Owens Bottle Company, which in 1929 merged with the Illinois Glass Company in 1929 to become Owens-Illinois, Inc. Today, O-I is an international company with 80 plants in 23 countries, joint ventures in China, Italy, Malaysia, Mexico, the United States and Vietnam, with 27,000 employees worldwide and 2,100-plus worldwide patents.

Michael J. Owens in front of one of his bottling machines from a film shot in 1910.

Here’s a short biography of Owens:

Michael Joseph Owens was an inventor of machines that could automate the production of glass bottles.

Michael J. Owens was born on January 1, 1859, in Mason County, West Virginia. As a teenager, he went to work for a glass manufacturer in Newark, Ohio.

During the late 1800s, Toledo, Ohio was the site of large supplies of natural gas and high silica-content sandstone — two items necessary for glass manufacturing. Numerous companies either formed in or relocated to Toledo, including the New England Glass Company, which relocated to Toledo in 1888. This same year, the company’s owner, Edward Drummond Libbey, hired Owens.

Within a short time, Owens had become a plant manager for Libbey in Findlay, Ohio. At this point in time, glass manufacturers in the United States had to blow glass to produce the bottles. This was a slow and tedious process. Owens sought to invent a machine that could manufacture glass bottles, rather than having to rely on skilled laborers, greatly speeding up the manufacturing process. On August 2, 1904, Owens patented a machine that could automatically manufacture glass bottles. This machine could produce four bottles per second. Owens’s invention revolutionized the glass industry. His machine also caused tremendous growth in the soft drink and beer industries, as these firms now had a less expensive way of packaging their products.

In 1903, after Owens had invented his bottle machine but before he had patented the invention, Owens formed the Owens Bottle Machine Company in Toledo. Libbey helped finance Owens’s company. This firm initially manufactured Owens’s bottle machine. By 1919, the firm had begun to manufacture bottles, and the company changed its name to the Owens Bottle Company. The company grew quickly, acquiring the Illinois Glass Company in 1929. The Owens Bottle Company became known as the Owens-Illinois Glass Company this same year. In 1965, the company changed its name one final time. It became and remains known as Owens-Illinois, Inc.

Owens retired in 1919. He did not live to see his company grow into such an important manufacturer of glass. He died on December 27, 1923, in Toledo, Ohio. Over the course of his life, Owens secured forty-five patents.

Here’s his biography from his Wikipedia page:

He was born in Mason County, West Virginia on January 1, 1859. He left school at the age of 10 to start a glassware apprenticeship at J. H. Hobbs, Brockunier and Company in Wheeling, West Virginia.

In 1888 he moved to Toledo, Ohio and worked for the Toledo Glass Factory owned by Edward Drummond Libbey. He was later promoted to foreman and then to supervisor. He formed the Owens Bottle Machine Company in 1903. His machines could produce glass bottles at a rate of 240 per minute, and reduce labor costs by 80%.

Owens and Libbey entered into a partnership and the company was renamed the Owens Bottle Company in 1919. In 1929 the company merged with the Illinois Glass Company to become the Owens-Illinois Glass Company.

To read more about Owens’ contributions, check out Michael Owens’ Glass Bottles Changed The World, by Scott S. Smith, Owens the Innovator at the University of Toledo, Today in Science, and the West Virginia Encyclopedia has a history of the Owens-Illinois Glass Company.

Beer Birthday: Michael Lewis

December 29, 2021 By Jay Brooks 4 Comments

Today is 84th birthday of Dr. Michael Lewis, who ran the brewing sciences department at U.C. Davis beginning in 1962, and became the Professor Emeritus in 1995, when Charlie Bamforth succeeded him, although Dr. Lewis remains active in teaching and in brewing. He was my instructor, along with Charlie, when I took the brewing short course at Davis over a decade. He’s taught countless working brewers over the years and has greatly influenced the industry as a whole. Join me in wishing Dr. Lewis a very happy birthday.

Michael receiving an award for a lifetime of achievement at the 2008 CBC in San Diego.

Michael with Ruhstaller founder J.D. Paino at Sudwerk (photo from the Davis Enterprise).

Michael (at far left) with the gang at Sudwerk Privatbrauerei in Davis (photo from the Davis Enterprise).