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Influence of Acetaldehyde on Growth and Acetoin Production by Leuconostoc citrovorum

Department of Food Science and Technology, University of California, Davis 95616

ABSTRACT

Addition of acetaldehyde (100 µg/ml) to glucose-citrate broth stimulated growth and approximately doubled the production of acetoin plus diacetyl by Leuconostoc citrovorum. Radioactive acetaldehyde was converted to ethanol; the acetoin, diacetyl and acetic acid produced were not radioactive. A discussion of the mechanisms by which species of Leuconostoc utilize citrate and carbohydrate suggests that the added acetaldehyde enhanced production of acetoin and diacetyl by increasing the availability of hydroxyethylthiamine pyrophosphate and acetyl-coenzyme A, and that it stimulated growth by permitting greater conversion of acetyl-coenzyme A and acetyl-phosphate to acetate and adenosine 5'-triphosphate.