Effects of wheat gluten hydrolysates fractionated by different methods on the growth and fermentation performances of brewer's yeast under high gravity fermentation

作者：Zhou Yongjing; Yang Huirong; Zong Xuyan; Cui Chun; Mu Lixia; Zhao Haifeng^*

来源：International Journal of Food Science and Technology, 2018, 53(3): 812-818.

DOI：10.1111/ijfs.13657

• Brewer's yeast
• ethanol precipitation
• fermentation performance
• high gravity fermentation
• ultrafiltration
• wheat gluten hydrolysates

Wheat gluten hydrolysates (WGH) were fractionated through ultrafiltration membrane with molecular weight (Mw) cut-off of 3kDa and ethanol precipitation, respectively. WGH and their fractions were used to examine their effects on the growth and fermentation performances of brewer's yeast under high gravity fermentation. Results showed that WGH and their fractions exhibited significant differences in biomass accumulation, viability, ethanol yield, free amino nitrogen and sugar consumptions under high gravity fermentation. Compared to WGH, the fractions with Mw<3kDa and the supernatant of WGH treated with ethanol precipitation showed better fermentation performance for brewer's yeast. The relatively lower molecular weight and the higher levels of Leu, Lys, His and Arg in these two fractions might be responsible for their bioactivity for brewer's yeast. Thus, both ultrafiltration and ethanol precipitation could be used as efficient methods for enriching peptides with significant growth- and fermentation-promoting activity for brewer's yeast under high gravity fermentation.

• 单位
  广东省农业科学院