共查询到17条相似文献,搜索用时 93 毫秒
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本文综述了甜酒酒曲根霉淀粉降解酶类全酶系及其降解产物研究、低聚糖酶产生菌的选育和混合发酵制作甜酒的研究前景。 相似文献
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采用马铃薯琼脂固体培养基(PDA),对贵阳及江西的地方特色甜酒曲中的根霉分离纯化,得到菌株Rhi-1(贵阳)和Rhi-2(江西)。以优良根霉菌株Q303为对照,探究其发酵性能。结果表明,Q303、Rhi-1(贵阳)和Rhi-2(江西)的糖化酶活力分别为238.6 mg/h·g、243.3 mg/h·g、195.4 mg/h·g,液化酶活力分别为0.237 g/g·h、0.253 g/g·h、0.178 g/g·h,Rhi-1的糖化力和液化力水平都高于Q303,是一株拥有良好发酵性能的菌株。将Rhi-1、Q303制成纯种根霉曲,接入蒸熟的糯米饭中,定时取样,测定不同阶段酒酿糖化酶活力、液化酶活力、总糖及总酸的变化趋势。通过GC-MS分析根霉的发酵产物发现Rhi-1的发酵产物里富含β-苯乙醇和乙偶姻,以及特征物质异己酸乙酯。 相似文献
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甜酒曲华根霉淀粉酶菌株紫外线诱变育种 总被引:1,自引:1,他引:1
通过平板菌落观察和显微镜检,从甜酒小曲中分离出华根霉淀粉酶菌株,通过平板菌落初筛测变色圈直径与菌落直径的比值(HE值)和摇瓶复筛测液化力、糖化力,筛选出1株HE值最大,液化力、糖化力最强的优良出发菌株,对其紫外线诱变处理,选育到1株较出发菌株酶活力高的优良变株SCLG-华根霉28.该菌株的HE值为1.52、液化力为70 min、糖化力为520 mg/(g·h),分别较出发菌株高出8.57%、12.50%、30.00%,且遗传性能稳定.将此优良变株制作的甜酒曲用于甜酒发酵实验对照,糖化相同重量的糯米,糖化时间减少3 h~4 h,液体渗出量明显增加,所得甜酒风味更足,甜味更浓. 相似文献
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根霉RN-1,根霉RQ-1,根霉RA-1,根霉RS-1是从酒曲中筛选纯化的高糖化力菌株。用该菌株制作甜酒糖分层析结果表明,其糖化产物主要为葡萄糖,不同展开剂以吡啶:正丁醇:水=4:6:3效果最好。 相似文献
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Haiping Shen Xinying Mo Xia Chen Dan Han Changxin Zhao 《Journal of the Institute of Brewing》2012,118(3):309-314
Rhizopus microsporus, recently isolated from a solid culture of Heng‐Shui Lao‐Bai‐Gan (HSLBG, a famous distilled liquor in Northern China) was found to produce a novel extracellular acid stable and thermostable α‐amylase. This fungal α‐amylase was purified using ammonium precipitation, Sephadex G‐25 desalination and DEAE‐52 cellulose chromatography. Its molecular weight was estimated to be 75 kDa by SDS–PAGE. The optimum pH and temperature of this enzyme was pH 5.0 and 70°C respectively. Thermostability and kinetic analysis through the Arrhenius and Michaelis–Menten equations revealed that this enzyme showed an exceptional activity at low pH and high temperature. A combination of this thermostability and acid stability could be a valuable trait for the efficient hydrolysis of amylose to glucose in large‐scale biotechnology applications. Copyright © 2012 The Institute of Brewing & Distilling 相似文献
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