Isolation, Identification, and Characteristics of Lactic Acid Bacteria for Production of Fermented Soymilk which Has Improved Sensory Quality
2016
Jung, M.G., Pusan National University, Miryang, Republic of Korea | Kim, S.I., Pusan National University, Miryang, Republic of Korea | Hur, N.Y., Osan University, Osan, Republic of Korea | Seong, J.H., Pusan National University, Miryang, Republic of Korea | Lee, Y.G., Pusan National University, Miryang, Republic of Korea | Kim, H.S., Pusan National University, Miryang, Republic of Korea | Chung, H.S., Pusan National University, Miryang, Republic of Korea | Kim, D.S., Pusan National University, Miryang, Republic of Korea
In order to improve the sour taste and foul odor of fermented soymilk, bacteria were isolated from kimchi and identified. Of the 89 bacterial strains isolated from kimchi, 3 isolates produced fermented soymilk with a sour taste and foul odor. The selected bacterial strains R53, R83, and R84 were identified by morphological, biochemical, and 16S rRNA analyses as Weissella koreensis. The strain R83, which produced fermented soymilk having the mildest sour taste and foul odor, was selected for further investigation and named W. koreensis KO3. The optimum culture condition for the fermentation of soymilk by W. koreensis KO3 was at 30oC for 12 h. When soymilk was fermented under the optimum culture conditions, the viable cell count reached up to 8.71 × 10∨8 CFU/ml and pH and acidity reached as low as 6.02 and as high as 0.33%, respectively. Twenty-seven amino acids and their derivatives were detected in fermented soymilk. The amounts of serine, glycine, threonine, alanine, and aspartic acid, which contribute to a sweeter taste, increased during fermentation. Orinithine, which was not detected before fermentation, increased during fermentation. Sensory evaluation showed that W. koreensis KO3-fermented soymilk has improved bean, roasted nut, and sour flavors as well as an enhanced mouthfeel, appearance, preferability, and overall acceptability compared with those of standard fermented soymilk. With further study and development, soymilk fermented by W. koreensis KO3 could serve as a health-promoting food with favorable sensory qualities.
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