Tyramine reduction by tyrosine decarboxylase inhibitor in for tyramine controlled .

This study was carried out to find a method to control tyrosine decarboxylase activity (TDC) of a strain of capable of producing high levels of tyramine. To select a TDC inhibitor, enzyme assay was first performed using purified TDC enzyme and 0.1% of TDC inhibiting chemicals.

Quantitative analysis of volatile flavor components in Korean alcoholic beverage and Japanese sake using SPME-GC/MS.

Quantitative analysis of the volatile flavor components in Korean alcoholic beverages ( and ) and Japanese sake was carried out using SPME-GC/MS. Fusel oils (n-butyl alcohol, isobutyl alcohol, isoamyl alcohol, and phenethyl alcohol), ethyl esters (ethyl acetate, isoamyl acetate, ethyl caproate, ethyl caprylate, and ethyl caprate) and aldehydes (furfural and benzaldehyde) were analyzed quantitatively by an 85 μm SPME fiber (carboxen/polydimethylsiloxane) using internal standards (1-pentanol-1-C and methyl nonanoate). Phenethyl alcohol (85-216 ppm) and isoamyl alcohol (38-115 ppm) constituted the majority of fusel oils in all the samples.