My current recommendation when either yeast extract or autolyzed yeast extract is listed as an ingredient in foods NOT labeled gluten-free is to contact the manufacturer and ask whether spent yeast from beer manufacturing is the source.Hereâs whyâ¦.y current recommendation when either yeast extract or autolyzed yeast extract is listed as an ingredient in foods NOT labeled gluten-free is to contact the manufacturer and ask whether spent yeast from beer manufacturing is the source. Hereâs whyâ¦.
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Aspartate transaminase. Aspartate transaminase (AST) or aspartate aminotransferase, also known as AspAT/ASAT/AAT or serum glutamic oxaloacetic transaminase (SGOT), is a pyridoxal phosphate (PLP)-dependent transaminase enzyme (EC 2.6.1.1) that was first described by Arthur Karmen and colleagues in 1954.