共查询到20条相似文献,搜索用时 56 毫秒
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运用Design Expert7.0 软件技术,采用响应曲面分析法,研究果胶提取影响因素对果胶提取得率的影响,建立果胶提取工艺数学模型。单因素试验结果表明,果胶提取得率最高的各影响因素值分别为:提取液pH2.2 左右,提取温度85℃,提取时间1.4h,液料比为3:1,盐析温度70℃。正交试验结果表明,提取液pH1.5、提取温度90℃、提取时间2.0h、盐析温度65℃、提取率最高为1.14%。果胶提取工艺数学模型为Y(%)=- 36.9 +1.39X1 + 0.785X2 - 1.95X3 + 0.142X4 - 0.0192X1X2 - 0.0151X1X3 - 0.0198X1X4+0.0289X2X3 - 0.0004X2X4 + 0.0237X3X4+ 0.386X1 - 0.0045X2 - 0.696X3 - 0.0008X4。 相似文献
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通过单因素和正交试验研究水提温度、pH值、提取时间、料液比4个理化因素对菠萝蜜果皮中果胶得率的影响,确定菠萝蜜皮果胶提取的最佳工艺参数。结果表明,酸提取最佳工艺为提取温度95℃、pH1.0、提取时间2.5h、液料比30:1(水:物料,m/m),果胶得率为12.46%;超声波辅助提取最佳工艺为80℃、50min、液料比40:1、pH1.0、450W,果胶得率为13.17%。超声波辅助提取可提高果皮中果胶得率和缩短时间。 相似文献
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通过响应面分析法对黄秋葵花果胶的提取工艺进行优化。以黄秋葵花为原料,采用酸解乙醇沉淀的方法提取黄秋葵花果胶,探讨酸种类、料液比、提取液pH、提取温度、提取时间对果胶提取率的影响。在单因素实验基础上,采用响应面对黄秋葵花果胶的提取工艺条件进行优化。研究表明,黄秋葵花果胶提取的最佳工艺条件为:料液比1∶30,提取温度90℃,盐酸溶液pH=1.60和提取时间2.76h,此时果胶理论得率达32.26%,验证值为32.46%,相对误差为0.62%。因此,该研究对产业化制备果胶有一定理论指导价值。 相似文献
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采用酸提取方法对菠萝蜜丝果胶的提取工艺条件进行研究,考察乙醇浓度、沉淀时间、提取温度、提取液pH、液料比、提取时间等因素对果胶提取率的影响。确定了酸提取菠萝蜜丝果胶的最佳工艺条件:乙醇浓度为70%、沉淀时间为50 min、提取液pH为2.5、提取温度为95℃、提取时间90 min、液料比为20∶1(mL/g)。在最佳提取工艺条件下,菠萝蜜丝中果胶的提取率为2.12%。 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