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Jae Young Choi, Sung Wook Hong, and Kun Sub Chung*Division of Biological Science and Technology, Yonsei UniversityAbstract Microorganisms, having the lower decarboxylase activity, among the isolated strains from cheonggukjang andrice-straw in this study were selected by using biogenic amine (BA) media. The selected strains were identified as Bacillussubtilis HH12, B. subtilis HR254, and Paenibacillus barcinonensis KR97, by using 16S rRNA analysis. PCR analysisshowed that the histidine decarboxylase (hdc) gene was absent in the HH12, HR254, and KR97 strains. However, PCRanalysis showed that the tyrosine decarboxylase (tdc) gene was present in the HH12, HR254, and KR97 strains.Quantitative analysis of the selected strains by using high-performance liquid chromatography showed that histamine wasabsent in the HH12, HR254, and KR97 strains. However, these 3 strains showed tyramine concentrations of 6.09, 3.68,and 6.30 mg/L, respectively. These strains produced lower concentrations of amines (approximately 7.9, 0, and 9.3%amines in the HH12, HR254, and KR97 strains, respectively) than the B. subtilis MC138 strain, which showed the higherprotease activity.Keywords: cheonggukjang, biogenic amine, Bacillus

Selection of Biogenic Amine-reducing Microorganisms from a Traditional Korean-style Fermented Food, Cheonggukjang