| Title: | Reduction of the off-flavor volatile generated by the yogurt starter culture including Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus in soymilk |
| Author(s): | Kaneko D; Igarashi T; Aoyama K; |
| Address: | "Research and Development Division, Kikkoman Corporation , 399 Noda, Noda, Chiba 278-0037, Japan" |
| ISSN/ISBN: | 1520-5118 (Electronic) 0021-8561 (Linking) |
| Abstract: | "Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus establish a symbiotic relationship in milk; however, S. thermophilus predominantly grows in soymilk. This study determined that excess diacetyl was notably generated mainly by S. thermophilus in soymilk, and this flavor compound created an unpleasant odor in fermented soymilk. The addition of l-valine to soymilk reduced the amount of diacetyl and increased the levels of acetoin during fermentation by S. thermophilus . In addition, it was found that the expression of the ilvC gene was repressed and that of the als and aldB genes was stimulated in S. thermophilus by l-valine. Sensory evaluations with the triangle difference test and a preference test showed that the soymilk fermented with l-valine was significantly preferred compared with that without l-valine. In this study, we successfully controlled the metabolic flux of S. thermophilus in soymilk and produced more favorable fermented soymilk without the use of genetically modified lactic acid bacteria strains" |
| Keywords: | Animals Cattle Fermentation Humans Lactobacillus delbrueckii/*metabolism Milk/metabolism/microbiology Soy Milk/chemistry/*metabolism Streptococcus thermophilus/*metabolism Taste Volatile Organic Compounds/analysis/*metabolism Yogurt/analysis/*microbiology; |
| Notes: | "MedlineKaneko, Daisuke Igarashi, Toshinori Aoyama, Kenji eng 2014/02/06 J Agric Food Chem. 2014 Feb 19; 62(7):1658-63. doi: 10.1021/jf404567e. Epub 2014 Feb 7" |
