Israeli scientists brew beer with revived ancient yeasts

JERUSALEM — Israeli researchers raised a glass Wednesday to celebrate a long-brewing project of making beer and mead using yeasts extracted from ancient clay vessels — some over 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 B.C. to the 4th century B.C.

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 to better understand the flavor of the ancient world.

“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.

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, excavates at Tel es-Safi, the biblical city of Gath, where ancient Philistine beer pots yielded yeasts used to brew a beer offered to journalists. He likened the revival of long-dormant yeast to the resurrection of ancient beasts fictionalized in “Jurassic Park,” but only to a point.

“In Jurassic Park, the dinosaurs eat the scientists,” he said. “Here, the scientists drink the dinosaurs.”

“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, he said.

The researchers said their next aim is to pair the resurrected yeasts with ancient beer recipes to better reproduce drinks from antiquity.

SEBASTIAN SCHEINER/AP Aren Maeir, an archaeologist and professor at Bar Ilan University, holds an ancient jar and a glass of beer during Wednesday’s news conference in Jerusalem.