Thursday 20 June 2019

Israeli scientists brew beer with revived ancient yeasts

The scientists are touting the brews made from ‘resurrected’ yeasts as an important step in experimental archaeology.

Craft brewer from Biratenu, the Jerusalem Beer Centre, Shmuel Naky, right, pours beer during a press conference in Jerusalem (Sebastian Scheiner/AP)
Craft brewer from Biratenu, the Jerusalem Beer Centre, Shmuel Naky, right, pours beer during a press conference in Jerusalem (Sebastian Scheiner/AP)

By Ilan Ben Zion, Associated Press

Israeli researchers have raised a glass to celebrate a long-brewing project of making beer and mead using yeasts extracted from ancient clay vessels – some more than 5,000 years old.

Archaeologists and microbiologists from the Israel Antiquities Authority and four Israeli universities teamed up to study yeast colonies found in microscopic pores in pottery fragments.

The shards were found at Egyptian, Philistine and Judean archaeological sites in Israel spanning from 3,000 BC to the 4th century BC.

The scientists are touting the brews made from “resurrected” yeasts as an important step in experimental archaeology, a field that seeks to reconstruct the past in order to better understand the flavour of the ancient world.

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Professor Aren Maeir, from Bar Ilan University, holds an ancient jar and a glass of beer (Sebastian Scheiner/AP)

“What we discovered was that yeast can actually survive for a very, very long time without food,” said Hebrew University microbiologist Michael Klutstein.

“Today we are able to salvage all these living organisms that live inside the nanopores and to revive them and study their properties.”

Beer was a staple of the daily diet for the people of ancient Egypt and Mesopotamia.

Early Egyptian texts refer to a variety of different brews, including iron beer, friend’s beer, and beer of the protector.

The yeast samples came from nearly two dozen ceramic vessels found in excavations around the country, including a salvage dig in central Tel Aviv, a Persian-era palace in southern Jerusalem and ‘En Besor, a 5,000-year-old Egyptian brewery near Israel’s border with the Gaza Strip.

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Ancient jars on display in Jerusalem (Sebastian Scheiner/AP)

The project was spearheaded by Hebrew University microbiologist Ronen Hazan and antiquities authority archaeologist Yitzhak Paz.

Other researchers of ancient beers, such as University of Pennsylvania archaeologist Patrick McGovern, have concocted drinks based on ancient recipes and residue analysis of ceramics.

But the Israeli scientists say this is the first time fermented drinks have been made from revived ancient yeasts.

Aren Maeir, a Bar Ilan University archaeologist, said: “It opens up a whole new field of the possibility that perhaps other microorganisms survived as well, and you can identify foods such as cheese, wine, pickles,” opening a portal into tasting cultures of the past.

For this initial experiment, the team paired up with a Jerusalem craft brewer to make a basic modern-style ale using yeast extracted from the pots.

The ale had a thick white head, with a caramel colour and a distinctly funky nose. The mead, made using yeast extracted from a vessel found in the ruins of a palace near Jerusalem that contained honey wine roughly 2,400 years ago, was champagne bubbly and dry, with a hint of green apple.

The beer incorporates modern ingredients, like hops, that were not available in the ancient Middle East – but it is the revived yeast that provides much of the flavour.

Press Association

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