Evaluation of Lactobacillus plantarum KCTC 3928 in Fermentation of Korean Soybean Paste (Doenjang)

초록

Lactobacillus plantarum KCTC 3928 was evaluated for use in Doenjang fermentation with four-fold approaches. Firstly, amino acids-profile of L. plantarum KCTC 3928 was investigated using MRS growth medium and found that this strain was the arginine pathway-deficient strain. Secondly, cell growth of L. plantarum KCTC 3928 in the sterilized Doenjang was carried out to determine susceptibility to inhibition by high concentration of salt (13.2%) in Doenjang. Thirdly, optimum addition ratio of L. plantarum KCTC 3928 and Doenjang upon investigation were 12.5 mg of cells and 10 g of Doenjang. Finally, conversion efficiency from glycoside isoflavone to aglycone isoflavone in Doenjang by L. plantarum KCTC 3928 was measured. The results indicate that L. plantarum KCTC 3928 can be used for low-salt Doenjang and Cheonggukjang fermentations.

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