Recent research at Brewlab and the University of Sunderland has retrieved live brewing yeasts from 120 year old bottles of beer to provide detailed information of the microbiology of lost Victorian and Edwardian stock ales.

Three bottles were retrieved by divers of Global Underwater Explorers from the shipwrecked vessel Wallachia which sank after a collision in the Clyde estuary in 1895. The ship carried a mixed cargo including whisky and beer from the McEwan’s brewery in Glasgow. The Wallachia is a difficult dive with limited light and obstacles. It has claimed one diver’s life in the past so the recovery team were particularly cautious in this expedition.

Two additional bottles were from the Bass brewery in Burton upon Trent and contained a 1902 10% ABV barley wine brewed for a visit by King Edward VII. Both beers represent examples of the stock ales commonly reputed as the best of British brewing due to their complex yeast character, high alcohol levels and long maturation.

The study, published in the Journal of the Institute of Brewing, analysed microbial DNA in the bottles by next generation sequencing identifying the yeasts and bacteria initially present. These included standard Saccharomyces yeasts but also yeasts associated with natural fermentations such as Brettanomyces and, unexpectedly, Debaryomyces a species rarely associated with brewing. This confirms that traditional beers were fermented with a mix of yeast species. Lactic acid bacteria were also identified and would contribute to the complexity of the beer.

Analysis of the beer provided information on the alcohol strength, bitterness, pH, colour and residual sugars so allowing recipes to be developed. The isolated yeasts are currently under investigation in test brews to produce recreations of the beers.

Brewlab director, Keith Thomas, says “This is a long running project in collaboration with Global Underwater Explorers who visited the Wallachia wreck three times to retrieve bottles. Our analyses provide a unique insight into the microbiology of Victorian and Edwardian brewing which is often felt to be a golden era of beers. We were very fortunate to isolate living yeast which we are studying in more detail.”

Dr Lewis Bingle from Sunderland University says that “The use of advanced molecular biology is increasingly helping us to investigate artifacts. This is a good example of where the past can provide insight to future brewing. We look forward to tasting the recreation compared to today’s beers.”

Andrew Pilley of Global Underwater Explorers says “The level of analysis and findings presented by the team at Brewlab has been fascinating. I am really pleased that our recovery of these bottles has facilitated this project and I look forward to any future developments with the research.”

Contacts:

Keith Thomas. Brewlab Ltd. E mail keith.thomas@brewlab.co.uk

Andrew Pilley. Global Underwater Explorers. E mail arpilley@hotmail.co.uk

Links.

Journal of the Institute of Brewing. https://onlinelibrary.wiley.com/doi/full/10.1002/jib.641

Wallachia. https://www.scottishshipwrecks.com/wallachia/

King’s Ale. http://www.mpeterson.co.uk/kings.htm

Brewlab. https://www.brewlab.co.uk

Global Underwater Explorers. https://www.gue.com/

Journal of the Institute of Brewing. https://onlinelibrary.wiley.com/doi/full/10.1002/jib.641

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