摘要:
该实验探讨了供氧情况、发酵pH和温度对各种产酯酵母酒精发酵和产酯的影响.结果表明,供氧情况对产酯酵母的酒精发酵和产酯均有显著影响,其中对克鲁斯假丝酵母的酒精发酵影响最大,对球拟酵母产酯影响最大.发酵pH对产酯酵母的酒精发酵和产酯有一定影响,其中卡特多菲毕赤酵母的最适产酒pH为5.0,克鲁斯假丝酵母和汉逊酵母最适产酒pH为4.0,球拟酵母最适产酒pH为6.0~7.0;上述4种产酯酵母的最适产酯pH均为6.7,高产酯酿酒酵母的最适产酯pH为6.0~7.0.温度对各种酵母的酒精发酵和产酯有一定影响,其中卡特多菲毕赤酵母、克鲁斯假丝酵母、汉逊酵母和球拟酵母的最适产酒温度均为28°C;卡特多菲毕赤酵母的最适产酯温度为20°C,克鲁斯假丝酵母、汉逊酵母和高产酯酿酒酵母为24°C,球拟酵母为28°C.%The effects of oxygen supply,fermentation pH and temperature on ethanol fermentation and ester production of yeast strains were investigated.The results demonstrated that the effects of oxygen supply on ester-producing yeasts were significant,it had the greatest effect on ethanol fermentation of Candida krusei and ester production was Torulopsis bombicola.Fermentation pH had certain effects on ethanol fermentation and eater production of ester-producing yeasts,the optimum alcohol-producing pH value of Pichia cactophila,Candida krusei and Hansenula anomala were 5.0,4.0 and 4.0,respectively,and the optimum alcohol-producing pH value of T.bombicola was 6.0-7.0.The optimum ester-producing pH value of the above 4 yeasts was 6.7.But the optimum ester-producing pH value of high ester yield Saccharomyces cerevisiae was 6.0-7.0.Temperature had certain effects on ethanol fermentation and ester production of ester-producing yeast strains,the optimum alcohol-producing temperature of P.cactophila,C.krusei,H.anomala and T.bombicola was 28 °C,and the optimum ester-producing temperature of P.cactophila,C.krusei,H.anomala,high ester yield S.cerevisiae and T.bombicola were 20 °C,24 °C,24 °C,24 °C and 28 °C,respectively.