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J Agric Food Chem ; 66(9): 2108-2113, 2018 Mar 07.
Article in English | MEDLINE | ID: mdl-29457725

ABSTRACT

Citrulline, the major precursor of ethyl carbamate in soy sauce, is an intermediate catabolite of arginine produced by bacteria present in soy sauce moromi mash. Pediococcus acidilactici is responsible for the formation of citrulline during the lactic acid fermentation process of soy sauce. However, citrulline accumulation during the alcoholic fermentation process and the corresponding bacteria involved have not been identified. Salt-tolerant, arginine-utilizing bacteria were isolated from moromi mash during the alcoholic fermentation process. Under normal cultivation conditions, arginine utilization by these strains did not contribute to citrulline accumulation. However, the conversion of arginine to citrulline by these bacteria increased when cultivated during the alcoholic fermentation process. Additionally, the ethanol-enhanced solubility of free fatty acids in moromi mash stimulated the accumulation of citrulline. Staphylococcus exhibited the highest capability in the conversion of arginine to citrulline.


Subject(s)
Arginine/metabolism , Carcinogens/metabolism , Citrulline/metabolism , Ethanol/metabolism , Pediococcus acidilactici/metabolism , Soy Foods/analysis , Soy Foods/microbiology , Staphylococcus/metabolism , Carcinogens/analysis , Citrulline/analysis , Ethanol/analysis , Fermentation
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