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刊物期号: 201806

不同麦汁浓度对Lager啤酒酵母氨基酸代谢及发酵性能的影响(17)

作者: 赵伯辰,张 柯,雷宏杰,徐怀德

地址:西北农林科技大学食品科学与工程学院,陕西 杨凌 邮编:712100
摘要 探讨不同浓度的全麦芽麦汁对酵母发酵性能、氨基酸同化和啤酒风味的影响。结果表明,麦汁浓度增大,可显著提高乙醇产量,促进高级醇的合成,减缓细胞生长,降低酵母活细胞率。与12 °P相比,16 °P、20 °P、24 °P高浓酿造中乙醇产量分别提高了32 %、99 %、116 %,发酵结束后,酵母活细胞率分别为93.8 %、88.50 %、76.44 %,高级醇水平分别提高了9 %、13 %、39 %,风味酯水平分别降低了42 %、55 %、50 %。通过高渗透压环境胁迫条件下酵母对游离氨基酸的同化量与发酵性能各指标之间的相关性分析可知,酵母Ser、Met、Phe、Trp、His的同化与发酵性能呈显著正相关性,说明这些氨基酸可改善酵母对高渗透压环境胁迫的适应性。
关键词 麦汁浓度; 啤酒酵母; 氨基酸; 生理特性; 发酵性能
中图分类号: TS262.5;TS261.1;TS261.4 文献标识码: A 文章编号: 1001-9286(2018)06-0017-08

英文标题: Effects of Different Wort Gravity on Amino Acids Assimilation and Fermentation Performance of Brewer′s Yeast

英文作者: ZHAO Bochen, ZHANG Ke, LEI Hongjie and XU Huaide

英文地址: College of Food Science and Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China

英文摘要 The effects of different gravities of whole-malt wort on the yeast fermentation performance, amino acids assimilation and beer flavor were studied. The results showed that, high wort gravity could significantly increase the yield of ethanol and the production of higher alcohols, and could reduce yeast growth and cell viability. Compared with the control group (12 °P, routine wort gravity), ethanol yield in experimental groups (16 °P, 20 °P and 24 °P wort gravity) increased by 32 %, 99 % and 116 % respectively. At the end of fermentation, cell viability were 93.8 %, 88.50 % and 76.44 % respectively, higher alcohols yield increased by 9 %, 13 % and 39 % respectively, and flavoring esters yield decreased by 42 %, 55 % and 50 % respectively. The correlations between assimilation amount of free amino acids and fermentation performance under different osmotic stress conditions were explored, and the results proved that the assimilation of Ser, Met, Phe, Trp and His was positively correlated with fermentation performance, suggesting that those amino acids could improve the adaption of yeast under high osmotic stress.
英文关键词 wort gravity; brewer's yeast; amino acid; physiological characteristics; fermentation performance
      

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