共查询到15条相似文献,搜索用时 236 毫秒
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通过单因素试验对一株耐高温马克斯克鲁维酵母(Kluyveromyces marxianus)HY32的木薯乙醇发酵工艺进行了研究。结果表明,HY32利用木薯发酵乙醇的最佳工艺条件为料水比1∶5(g∶mL),发酵时间96 h,接种量11%,发酵温度40 ℃,液化时间1 h,液化温度95 ℃,液化酶添加量为20 U/g淀粉,糖化酶添加量为150 U/g淀粉,硫酸铵添加量6 g/L,初始pH=5.0。在此条件下,HY32发酵木薯酒精度可达8.90%vol,淀粉利用率与淀粉出酒率分别为87.120%和49.48%,残糖量为0.03 g/L。与未优化的初始发酵条件相比,发酵醪的酒精度提高了16.65%。 相似文献
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为了评估陈化纯淀粉掺入陈化粮生产燃料乙醇的应用效果,通过摇瓶试验,以陈化水稻、陈小麦和淀粉为原料,研究酸性蛋白酶和接种量对于高浓度乙醇发酵的影响。结果显示,以陈化水稻和陈化小麦为基础培养基,添加一定比例的淀粉有利于酒精度的提高,当添加量为40%~50%时,酒精度达到最高(13.4%vol~13.6%vol),总糖消耗较为彻底;采用高浓度淀粉醪液(总糖270 g/L左右)和酸性蛋白酶发酵可以有效提高发酵强度,尤其将接种量提升至40%左右时,最高酒精度可达15.1%vol,出酒率达52%以上。采用50 L发酵工艺验证,发现发酵指标与摇瓶一致,DDGS产品蛋白指标较佳。此研究结果表明将高浓度的淀粉以一定比例掺入到混合陈化粮醪液发酵是可行的,具有较强的工业化应用参考价值。 相似文献
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利用选育的耐酸耐高温酵母Q-10,采用甜高粱秸秆固态发酵生产燃料乙醇.当接种量为5%,发酵温度34℃,发酵起始pH4.0,糖化酶和纤维素酶用量分别为50U/g原料和20U/g原料,发酵周期4d时,乙醇体积分数达到6.5%.小试试验乙醇体积分数达到6.4%.工业试验乙醇体积分数达到6.0%. 相似文献
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该试验研究不同预处理方法对马铃薯发酵生产乙醇的影响。通过单因素及正交试验对发酵工艺进行优化,最终确定以下发酵条件为发酵温度31 ℃,料水比1∶5.0(g∶mL),耐高温淀粉酶添加量15 U/g、糖化酶添加量160 U/g、纤维素酶添加量10 U/g,酵母接种量0.4%、发酵时间为84 h,优化后的发酵液中乙醇含量可达9.06%vol。获得的最优发酵工艺条件可为马铃薯发酵生产乙醇的工业化处理提供参考依据。 相似文献
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Yuji Teramoto Noriaki Saigusa Seinosuke Ueda Kiyoshi Yoshizawa 《Journal of the Institute of Brewing》1994,100(3):163-166
The quality of rice wine made from uncooked, unpolished aromatic red rice grain was improved by use of a commercial preparation of acid protease from Aspergillus niger during ethanol fermentation. The fermentation rate of the mash which contained the acid protease was much higher than that of mash that did not contain the preparation of acid protease. The rice wine made from uncooked, polished aromatic red rice, which usually had a less acceptable aroma, was improved by use of the preparation of acid protease, and large amounts of isobutyl alcohol, n-propyl alcohol and ethyl acetate were detected in the resultant rice wine. By contrast, the quality of rice wine made from the bran fraction of aromatic red rice was not improved by the preparation of acid protease. The polished rice fraction of aromatic red rice was affected by the acid protease and the aromatic quality of the rice wine was improved. The aromatic characteristics of red rice wine made from cooked, unpolished aromatic red rice grains, which was rather inferior in terms of both aroma and color, were also improved by the addition of the preparation of acid protease during ethanol fermentation. Thus acid protease has beneficial effects on the production of aromatic red rice wine. 相似文献