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酒精高浓度发酵能够提高发酵醪液含酒分,可以节省酒精蒸馏蒸汽消耗量,减少酒精废醪液排放量,提高设备利用率,日益受到酒精生产企业的重视。目前糖蜜酒精生产发酵含酒分普遍偏低,糖蜜高浓度发酵面临很大困难,笔者认为主要原因是糖蜜中的灰分和胶体等杂质含量不断增高,会抑制酵母的繁殖和发酵,影响糖蜜高浓度发酵酒精。对糖蜜进行澄清处理是实现糖蜜酒精浓醪发酵的快捷途径,通过对糖蜜快速热澄清处理,得到糖蜜高浓度发酵酒精,与传统糖蜜酸化后发酵酒精相比,发酵含酒分明显提高,发酵成熟醪锤度降低。 相似文献
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报道了高产酿酒酵母(Saccharomycescerevisiae)菌株MF1001的甘蔗糖蜜酒精发酵特性及利用该菌株进行甘蔗糖蜜高浓度酒精发酵的结果,结果表明,20°Bx糖蜜对菌株的酒精发酵没影响,发酵的适宜温度为30℃,pH4.0的发酵效果明显优于pH3.80。按目前甘蔗糖蜜酒精生产的发酵工艺,用20°Bx糖蜜培养基培养菌株,制备种子液,然后将种子液与55°Bx的糖蜜培养基1:1混合进行中试发酵,发酵48~52h的醪液酒精含量达到了13.3~13.4%(V/V)。发酵结束时醪液可发酵残糖含量为0.64~1.02%。将该菌株用于5万吨规模的甘蔗糖蜜酒精发酵生产,全年生产的成熟醪酒精含量维持在12.5%(V/V)以上,发酵效率维持在91~93%,生产吨酒精的废液排放维持在8吨左右,生产效益显著。 相似文献
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通过糖蜜酒精残液的自然搅拌发酵和添加水解菌剂的生物发酵以及糖蜜酒精残液水培试验,研究了添加1%水解菌剂对糖蜜酒精残液DO值(溶解氧)、p H值和EC值的影响。结果表明,添加生物发酵水解菌剂对糖蜜酒精残液DO值和EC值影响不显著,但可提高糖蜜酒精残液的p H值,同时植物水培试验效果观察发现,和添加新鲜糖蜜酒精残液比较,添加一定比例发酵的糖蜜酒精残液可减轻对植物的毒害作用。上述研究结果可对糖蜜酒精残液的进一步开发研究生产生态型有机液体肥料提供理论支撑。 相似文献
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以海藻酸钙和甘蔗块为载体固定酵母细胞,进行蔗汁和废糖蜜酒精发酵。结果表明,以甘蔗汁为发酵培养基时甘蔗块固定化酵母发酵液中平均残糖锤度(20℃)比海藻酸钙包埋酵母发酵低0.36,酒精平均体积分数比海藻酸钙包埋酵母发酵高0.20%;以废糖蜜为发酵培养基时甘蔗块固定化酵母发酵液中平均残糖锤度(20℃)比海藻酸钙包埋酵母发酵低0.43,酒精平均体积分数比海藻酸钙包埋酵母发酵高0.23%,显示出甘蔗块固定化法酵母发酵优于海藻酸钙包埋法固定化酵母。此外,甘蔗汁培养基与废糖蜜培养基对总体发酵效果的影响非常接近,但综合考虑甘蔗汁与废糖蜜的成本,废糖蜜是工业发酵生产乙醇用培养基的更优选择。 相似文献
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大豆糖蜜双歧酸奶的研制 总被引:1,自引:0,他引:1
研究添加大豆糖蜜作为促进剂对酸奶产品感官品质和pH值的影响,初步探讨大豆糖蜜在双歧保健酸奶中的应用。试验结果表明,在100ml的纯鲜奶中选择发酵剂添加量为7ml,蔗糖添加量为5~7g,大豆糖蜜添加量为2g时,可获得感官品质较好的大豆糖蜜双歧酸奶产品。制品中pH值的变化与糖蜜、蔗糖添加量存在密切联系。添加大豆糖蜜作为双歧因子,在双歧酸奶中的应用具有一定的可行性。 相似文献
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Vesna M. Vu
urovi Vladimir S. Puka Uro D. Milji 《Journal of the Institute of Brewing》2019,125(1):134-142
The aim of this study was the investigation and comparison of the potential of sugar beet molasses and thick juice as raw materials for bioethanol production, as renewable and sustainable energy sources. Ethanol fermentation of a wide range of initial sugar concentrations (100–300 g/L) was performed using either free or immobilised Saccharomyces cerevisiae in calcium alginate beads in the absence of any added nutrients. In general, immobilised cells showed better fermentative performance, enhanced ethanol productivity, stability and cell viability compared with free cells, under the same fermentation conditions. The high concentration of non‐sugar components contained in molasses affected yeast fermentation performance and viability. Maximum ethanol concentration in fermented media of 84.6 and 109.5 g/L were obtained by immobilised cells for initial sugar concentrations of 200 and 250 g/L for molasses and thick juice, respectively. However, the highest ethanol yields of 31.7 L per 100 kg of molasses and 37.6 L per 100 kg of thick juice were obtained by immobilised cells at an initial sugar concentration of 175 g/L. In the high gravity fermentation process, thick juice resulted in a higher ethanol yield per mass of raw material compared with molasses. This study shows the advantage of immobilised yeast for the efficient production of high gravity bioethanol from thick juice, which was a more favourable raw material than molasses. © 2018 The Institute of Brewing & Distilling 相似文献
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研究了不同糖浓度下氮源对酿酒酵母GJ2008甘蔗汁酒精发酵的影响,旨在为高浓度甘蔗汁酒精发酵提供研究基础。将2 g/L尿素加入150 g/L、200 g/L、250 g/L、300 g/L和350 g/L总糖质量浓度甘蔗汁培养基中,以对应糖浓度未添加氮源组为对照组,通过分析细胞生长、糖代谢和乙醇生成来探究氮源如何影响甘蔗汁酒精发酵。结果表明:与未添加氮源相比,氮源加快了发酵速度,发酵周期最高缩短为18 h,糖消耗速率和乙醇生成速率最大分别提高了55%和96%;使酒精发酵更彻底,总糖含量最高减少了40.42 g/L;增加了目的产物,乙醇含量最高提升了28.4%。说明氮源有效地促进了甘蔗汁酒精发酵,加强了酵母的无氧呼吸途径。 相似文献
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以糖蜜废水和人工稀释的赤糖水为发酵底物,采用连续流搅拌槽式反应器(Continuous Stirred Tank Reactor,CSTR)作为反应装置,对两种底物厌氧发酵产氢稳定性进行了探讨。结果表明:当水力停留时间(HRT)为6.2h,温度控制在(35±1)℃,维持反应器内底物COD浓度负荷为3000mg/L时,以糖蜜和赤糖废水为底物时,其最大产氢量分别为0.65L/d和1.95L/d。其液相末端组分的比例也发生了较大的变化,在发酵前28d主要以乙酸和丙酸为主,当底物由糖蜜变为赤糖时,丙酸和丁酸的比例明显下降,其比例从底物改变前的25.7%和15.4%下降到底物改变后的11.8%和9.47%,发酵类型由混合酸发酵转变为稳定的乙醇型发酵。 相似文献
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Effect of Initial PH on Growth Characteristics and Fermentation Properties of Saccharomyces cerevisiae 下载免费PDF全文
Xingyan Liu Bo Jia Xiangyu Sun Jingya Ai Lihua Wang Cheng Wang Fang Zhao Jicheng Zhan Weidong Huang 《Journal of food science》2015,80(4):M800-M808
As the core microorganism of wine making, Saccharomyces cerevisiae encounter low pH stress at the beginning of fermentation. Effect of initial pH (4.50, 3.00, 2.75, 2.50) on growth and fermentation performance of 3 S. cerevisiae strains Freddo, BH8, Nº.7303, different tolerance at low pH, chosen from 12 strains, was studied. The values of yeast growth (OD600, colony forming units, cell dry weight), fermentation efficiency (accumulated mass loss, change of total sugar concentration), and fermentation products (ethanol, glycerol, acetic acid, and l ‐succinic acid) at different pH stress were measured. The results showed that the initial pH of must was a vital factor influencing yeast growth and alcoholic fermentation. Among the 3 strains, strain Freddo and BH8 were more tolerant than Nº.7303, so they were affected slighter than the latter. Among the 4 pH values, all the 3 strains showed adaptation even at pH 2.50; pH 2.75 and 2.50 had more vital effect on yeast growth and fermentation products in contrast with pH 4.50 and 3.00. In general, low initial pH showed the properties of prolonging yeast lag phase, affecting accumulated mass loss, changing the consumption rate of total sugar, increasing final content of acetic acid and glycerol, and decreasing final content of ethanol and l ‐ succinic acid, except some special cases. Based on this study, the effect of low pH on wine products would be better understood and the tolerance mechanism of low pH of S. cerevisiae could be better explored in future. 相似文献