共查询到20条相似文献,搜索用时 109 毫秒
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以豆渣为原料,以保加利亚乳杆菌(Lb)和嗜热链球菌(St)为混合菌种,用发酵法制备不溶性膳食纤维(IDF)。通过发酵温度、初始pH值和接种比例等因素对不溶性膳食纤维得率的影响进行单因素试验和正交试验,确定最佳发酵工艺参数。结果表明,在豆渣∶水=1∶3(质量比)、白砂糖2%和接种量4%的条件下,当发酵温度42℃、初始pH值6.35、接种比例1∶1时,大豆不溶性膳食纤维的得率为83.27%。 相似文献
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该研究对凝结芽孢杆菌发酵乳生产工艺进行了优化。以凝结芽孢杆菌13002、保加利亚乳杆菌CGMCC 1.290、嗜热链球菌CGMCC 1.2741共发酵的新型发酵乳为研究对象,以不同菌种复配比、菌种接种量、发酵基低聚果糖添加量进行单因素实验,再以感官评分为响应值,通过Box-Behnken中心组合建立数学模型研究发酵乳的最佳生产工艺。结果表明,菌种复配比(凝结芽孢杆菌:(嗜热链球菌:保加利亚乳杆菌=1:1))3:1、低聚果糖添加量1.50%、接种量1.50%为最佳工艺条件。在该优化条件下,测定发酵乳的平均滴定酸度值为90.59,与模型预测酸度值(93.25)拟和率达97.15%,说明此凝结芽孢杆菌发酵乳具有一定的竞争优势,为新型发酵乳研发提供理论基础和拓展思路。 相似文献
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《中国乳品工业》2020,(2)
本试验通过3个菌株混合发酵,探明其对搅拌型酸乳品质的影响和协同效果,旨在为新型保健乳产品开发提供技术参数。通过单因素试验和正交试验,选用保加利亚乳杆菌(Lactobacillus Bulgaricus,LB)、嗜热链球菌(Streptococcus Thermophilus,ST)以及双歧杆菌(Bifidobacteria,B)3个菌株共生发酵,根据理化指标和感官评分结果,确定搅拌型酸乳最佳发酵工艺。结果表明,(1)LB、ST及B共生发酵对酸乳的酸度和黏度有显著影响。(2)最优发酵工艺条件为:菌种比例LB∶ST∶B=1∶1∶1,菌种接种量2%,发酵温度42℃,热处理温度95℃,均质温度60℃。保加利亚乳杆菌、嗜热链球菌及双歧杆菌混合发酵能够改善酸乳的品质,3个菌株协同发酵效果较好。 相似文献
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何燕保 《纺织高校基础科学学报》2002,15(1):90-93
CET band IV has become a very important large-scale language testin China since its start in1 987.It has not only promoted English teaching in institutions of higher learning greatly,but alsobeen welcomed by people outside the campus.According to statistics,from1 997on,the number ofstudents taking this test has reached 2 .3 million annually[1] .But,as to the nature of the test,therehas been vague explanation.The designing committee of CET band IV has classified it as anachievement test.Th… 相似文献
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家具整体测试法是家具毒害物质测试的趋势。本文主要对家具测试用环境气候舱的产生背景、原理构造、测试优点等方面进行简要介绍。 相似文献
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以膜浓缩茶汁为原料制备了纯茶饮料 ,并就其风味、澄清性及过滤方面的特性进行了对比实验 ,得出膜浓缩茶汁将是生产茶饮料的最佳选择的结论。 相似文献
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François Sauvageot Virginie HerbreteauMarie Berger Catherine Dacremont 《Food quality and preference》2012,24(1):1-7
Fifteen groups of participants in nine laboratories performed triangle tests with two pairs of soft drinks. Groups differed in practice level with triangle tests: eight groups of 60 consumers who were not used to triangle test, three groups of qualified assessors who have already performed a few triangle tests, and four groups of trained assessors with a more extensive practice of triangle tests; qualified and trained groups included 9 or 18 assessors. The soft drinks were made from syrups at two levels of dilution in order to achieve about 55% of correct responses to test for difference and about 40% of correct responses to test for similarity. Participants performed three replicated tests with each pair of drinks, except the groups of 9 assessors who performed six replicated tests. When testing for difference, large inter-groups differences were observed. One consumer group and one trained group from two different laboratories failed by far to reach the critical number of correct responses leading to demonstrate a significant difference between products. For similarity test, all consumer groups demonstrated a significant similarity whereas two qualified groups and one trained group did not. This is explained by a slightly higher level of performance for qualified and trained assessors compared to consumers. 相似文献
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综合考虑气敏元件实验测试和生产测试的要求,研制了能测试气敏元件各种特征电参数及周围环境温度、湿度的微机测试系统,系统软件部分采用模块化程序设计,并引入了虚拟电阻概念,通过软件虚拟计算可查看不同负载下元件的数据,测试处理结果以文字、图像直观动态显示,易维、扩展性强,可大大提高实验和生产效率。 相似文献
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目的 对甲鱼肽粉的安全性进行初步评价研究。方法 采用大、小鼠急性毒性试验、Ames 试验、小
鼠骨髓嗜多染红细胞微核试验、小鼠精子畸形试验和大鼠 30 d 喂养试验对甲鱼肽粉进行急性毒性、遗传毒性
和亚慢性毒性研究。结果 甲鱼肽粉对大、小鼠经口最大耐受量(MTD)均大于 20.0 g/(kg.bw); Ames 试验显示
在加与不加 S9 时各剂量组回变菌落数与自发回变对照组比较差异无统计学意义(P>0.05); 小鼠骨髓嗜多染红
细胞微核试验和精子畸形试验结果显示, 各剂量组的微核率和精子畸形率与阴性对照组比较差异均无统计学
意义(P>0.05); 30 d 喂养试验表明甲鱼肽粉未见明显毒性反应, 最大未观察到有害作用的剂量为 8.4 g/(kg.bw)。
结论 在本次实验条件下, 甲鱼肽粉经口 MTD>20.0 g/(kg.bw), 属实际无毒级, 并且未见遗传毒性, 30 d 喂养
试验未见其对受试动物有毒性损害作用。 相似文献