共查询到19条相似文献,搜索用时 109 毫秒
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研究了添加不同量的辣蓼草对小曲中的微生物种类和数量、糖化力、液化力及发酵率的影响。结果表明,在一定范围内添加辣蓼草对小曲质量具有良好的促进作用,其合理添加量为12%;探讨和分析了辣蓼草对小曲pH值、透气性等方面影响的机理。(孙悟) 相似文献
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对米曲霉的制曲条件进行优化,研究了装量、翻曲、接种量、培养温度、时间对酶活的影响.结果表明,米曲霉制曲的最佳条件为:装量为30g(干料)、接种量为4%、温度35℃、培养78 h,其间间隔24 h进行翻曲.在此培养条件下,米曲酶的糖化力可达到5205.23 u/g,液化力可达到250 u/g. 相似文献
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测试虎杖提取物对食品腐败菌的抑制作用,与苯甲酸钠的抑菌效果相比较,并选择有代表性的食品进行防腐试验。确定了虎杖提取物的最低抑菌浓度。 相似文献
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添加不同量的辣蓼草对机械化黄酒酵母菌株的发酵特性进行研究。试验结果表明,在一定范围内添加辣蓼草对机械化黄酒酵母质量具有良好的促进作用。 相似文献
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微生物酶法从虎杖中提取白藜芦醇的研究 总被引:1,自引:0,他引:1
用微生物发酵法酶解虎杖,可以提高从虎杖中获取白藜芦醇的得率.通过对多种含糖甙键水解酶菌株的筛选,获得四株可以直接作用于虎杖的优良菌株.其中用 Aspergillus niger 1分解虎杖,提取白藜芦醇,与传统醇提工艺和自酶解法相比,提取率明显提高. 相似文献
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目的 通过DNA序列变异,初步研究何首乌品种的亲缘关系及其与地理分布的相关性.方法 采用PCR直接测序技术对来源于何首乌15个居群的17个样品的叶绿体matK基因进行测序分析研究.结果 何首乌的matK基因长度均为1271bp,根据排序比较,何首乌17个样品间存在12个变异位点,用UPGMA(不加权的算术平均对群法)法构建的系统分支树将其分成四支.结论 matK基因序列可变位点为何首乌品种的归并提供了分子依据,且品种的亲缘关系与地理分布呈良好的相关性. 相似文献
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Ali Yldrm Ahmet Mavi Aye Aydan Kara 《Journal of the science of food and agriculture》2003,83(1):64-69
The antioxidant activities, reducing powers, 2,2‐diphenyl‐l‐picrylhydrazyl (DPPH) radical‐scavenging activities, total phenolic compound contents and antimicrobial activities of ether, ethanol and hot water extracts of Polygonum cognatum Meissn were studied in vitro. The highest antioxidant activity was found in the water extract. However, there were no statistically significant differences among 15 µg ml?1 extract‐containing samples in linoleic acid emulsion (0.02 M , pH 7.0) during 120 h of incubation (P > 0.05). The reducing power of the water extract was the highest, but its reducing power was markedly lower than that of ascorbic acid. The highest DPPH radical‐scavenging activity was found in the water extract, with 50% DPPH radical scavenging at a concentration of 100 µg ml?1 dried water extract, while at the same concentration of dried ethanol extract the value was 12%. Surprisingly, no DPPH radical‐scavenging activity was observed in the ether extract. The concentrations of phenolic compounds found were 0.48, 0.50 and 0.01 µg ml?1 gallic acid equivalent in 10 µg ml?1 water, ethanol and ether extracts respectively. The ether and ethanol extracts showed antimicrobial activity against Staphylococcus aureus and Bacillus subtilis. The water extract did not show antimicrobial activity against the studied micro‐organisms. © 2002 Society of Chemical Industry 相似文献