Researchers may have discovered a jar of the world's oldest cheese in the tomb of an ancient Egyptian mayor, but - frustratingly for turophiles - the taste of the bacteria-laced sample is likely to remain a mystery.

The discovery, announced in the American Chemical Society's Analytical Chemistry journal this week, came after researchers tested the whitish contents of the jar found in the tomb of Ptahmes, a mayor of 13th century BC Memphis, an important capital in ancient southern Egypt.

"This is the oldest solid cheese ever found," Enrico Greco, a scientist with the department of Chemical Sciences at the University of Catania who coauthored the report, told The Telegraph.

Remains of cheese-like products older than the jar's contents had previously discovered in Poland, China, and Egypt, but a scientist who took part in the discovery says they were the products of natural fermentation so were more like yogurt than cheese.

Older samples discovered elsewhere were "more attributable to natural fermented milk like yogurt or kefir. In our case we didn't find any biomolecular traces of proteins resulting from natural fermentation of milk," Mr Greco said.