共查询到20条相似文献,搜索用时 15 毫秒
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以纤维废弃物为原料,采用纤维素酶降解糖化发酵生产酒精.结果表明:甘蔗渣经1.0%稀硫酸121℃保温2 h预处理后,采用40 U/g纤维素酶,50℃,pH=5.0,酶解120 min,得糖率为36.8%.由正交试验分析可知,用酿酒酵母发酵生产酒精的最佳条件为:发酵时间72 h,发酵温度为28℃,酵母接种量1.00%,在此条件下,酒精产率为15.31 g/g;4个因素对酒精产率的影响,其重要性顺序依次为发酵时间>发酵温度>酵母接种量>纤维素酶用量. 相似文献
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Effects of altering fermentation parameters on glycerol and bioethanol production from cane molasses
Cate N Munene Willem H Kampen Henry Njapau 《Journal of the science of food and agriculture》2002,82(3):309-314
Current bioethanol production processes do not produce more than approximately 13 g l?1 glycerol at a purity of 11% total solids in the fermented mash. Such quantities are not sufficiently high for economic exploitation unless very‐large‐capacity plants are involved. It was envisaged that the ratio of glycerol to bioethanol could be altered in favour of glycerol by adjusting such fermentation parameters as osmotic pressure (water activity), pH, temperature and yeast cell inoculum. At 39.9 ° brix, pH 8.7, 38 °C, 90.7 atm and 120 × 106 yeast cells ml?1, glycerol formation in fermented mash increased to 56 g l?1 at a purity of 14% total solids. The potential for high glycerol production, hence higher revenue, has been demonstrated. Adoption of this technology could have a significant positive economic impact on existing or new biomass‐to‐ethanol plants. © 2002 Society of Chemical Industry 相似文献
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以大米为试验原料,葡萄糖值(DE值)和酒精度为考察指标,研究大米酒精发酵工艺对米醋生产过程的影响。通过正交试验确定大米液化的最佳工艺条件为料水比1∶2.5(g∶mL),液化酶0.3%,氯化钙0.1%,液化温度97 ℃,液化时间90 min;糖化的最佳工艺条件为糖化酶0.2%,糖化温度65 ℃,糖化时间为60 min;酒精发酵的最佳工艺条件为酵母接种量0.25%,发酵温度33 ℃,发酵时间12 d。在此最佳条件下,最终发酵前醪液的还原糖含量和DE值分别达到19.8 g/100 mL和75.8%,发酵后酒精度达到12.0%vol,出酒率为37.67%。 相似文献
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酒精发酵工艺的管理,是食醋酿造的关键之一。阐述了从糖度、温度、pH、时间等方面对酒精发酵工艺过程进行管理、夏天酒精发酵工艺的管理、酒精发酵异常的原因及其防治措施等内容。 相似文献
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采用金华1号红肉枇杷为试验材料,对枇杷醋生产工艺中酒精发酵工艺参数进行优化,并分析醋基的酸味特征。研究酵母种类及接种量、发酵pH、发酵温度和初始糖度对枇杷醋醋基品质的影响,并以酒精度为响应值确定最优的发酵条件。结果表明,酵母菌种Yb为枇杷醋醋基酒精发酵优势酵母菌种,最优工艺参数为发酵温度25℃,酵母接种量0.05%、pH 3.5,该条件下枇杷醋醋基酒精度8.50%Vol,有机酸含量12.228g/L。枇杷醋醋基酸味特征主要由苹果酸、乳酸、乙酸和琥珀酸构成,占总有机酸的95.4%,构成枇杷醋醋基酸味感的94.7%。高含量酒精和适当含量的有机酸是后续醋酸发酵后醋酸含量的保证以及构成枇杷醋果酸味和一定功能作用的重要成分。 相似文献
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玉米生料发酵生产燃料乙醇工艺研究 总被引:5,自引:0,他引:5
对玉米生料发酵生产燃料酒精工艺进行了研究.通过正交试验得到生料发酵工艺最佳条件:酵母0.3%,糖化酶200 U/g,纤维素酶0.15%,料水比1:2.5,搅拌为140 r/min,发酵温度29℃.在此条件下,进行10L发酵罐试验,发酵时间120 h左右,最终淀粉利用率为93%左右.考虑到综合技术与经济效益,最终的最佳条件确定为:酵母0.2%,糖化酶250 U/g,纤维素酶0.1%,料水比1:2.5,搅拌为140 r/min,发酵温度29℃,发酵时间为85 h~95 h. 相似文献
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Yu-Ting Gao Yu-Shu Zhang Xiang Wen Xiao-Wan Song Dan Meng Bing-Juan Li Mei-Yan Wang Yong-Qing Tao Hui Zhao Wen-Qiang Guan Gang Du 《International Journal of Food Science & Technology》2019,54(1):102-110
Increasing glycerol production in low-temperature wine fermentation is of concern for winemakers to improve the quality of wines. The objective of this study was to investigate the effect of 10 different Saccharomyces cerevisiae on the kinetics of production of glycerol, ethanol and the activities of glycerol-3-phosphate dehydrogenase (GPD) and alcohol dehydrogenase (ADH) in low-temperature fermentation. Ethanol production was influenced by temperature, and it was slightly higher at 13 °C than at 25 °C. Glycerol yields were significantly affected by both temperature and strains. More glycerol was produced at 25 °C than at 13 °C because the activity of GPD was higher at 25 °C than at 13 °C. Glycerol production of the different yeast strains was up to 3.19 and 3.18 g L−1 at 25 and 13 °C, respectively. Therefore, isolating the yeast strains with high glycerol production and adaptation to low-temperature fermentation is still the best method in winemaking. 相似文献
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对黑曲霉孢子进行热击处理,探讨了热击处理促进孢子萌发和木聚糖酶活力的机制。结果显示,42℃下热击4h后转入29℃发酵,可以促使黑曲霉孢子较早萌发和菌丝的较快生长。热击处理后发酵过程中的菌丝干重始终高于恒温发酵处理,其中发酵24h的菌丝干重比恒温发酵高38.5%;热击下变温发酵在72h时达到最大生物量,比恒温发酵提前12h。经过热击处理后的发酵产酶总量和单位质量菌丝产酶量都高于恒温发酵,尤其在发酵86h分别比恒温对照高出46.2%和23.5%。热击处理对于胞内木聚糖酶比例影响不大,酶谱检测发现对木聚糖酶的种类也没有影响。 相似文献