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试验研究了明胶、壳聚糖对苦荞杆浸提液澄清工艺。结果表明:明胶澄清最佳工艺条件为浓度1%明胶用量2.5 mL、澄清时间4 h、温度40℃;壳聚糖澄清最佳工艺条件为浓度1%壳聚糖用量1.0 mL、澄清时间8 h、温度40℃。澄清后,浸提液清亮透明。 相似文献
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以柑橘和蒲公英为主要原料,研制柑橘蒲公英保健饮料,并探讨各因素对柑橘汁酶解、蒲公英浸提及饮料调配效果的影响。结果表明,柑橘汁的最佳酶解工艺为果胶酶和纤维素酶按1∶3的比例添加,添加量为0.6%,pH值3.0,时间3h、温度50℃;蒲公英的最佳超声浸提条件为超声频率40 kHz,料水比1∶30,温度80℃,提取2次,每次1.0h;饮料最佳调配工艺为冰糖10%、蒲公英浸提液20%、柑橘汁8%、CMC 0.3%、柠檬酸0.2%,在此条件下制得的产品风味独特,营养丰富,质量最佳。 相似文献
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本文以油茶籽粕为原料探究茶皂素的提取纯化工艺参数。以无水乙醇为提取剂,考察了乙醇浓度、提取温度、提取时间、料液比4个因素对茶皂素得率的影响。实验结果表明,茶皂素的最佳提取纯化工艺条件为乙醇浓度60%、浸提温度60℃、浸提时间2.0 h、料液比1∶10。在此条件下茶皂素提取平均得率为(22.36±0.15)%,通过大孔树脂纯化得到纯度为88.20%的茶皂素纯品。该方法克服了提取茶皂素色泽深、茶皂素得率低、工艺复杂等缺点,通过优化提取条件,提高了茶皂素得率,进一步提高了茶皂素纯度。 相似文献
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AbstractConsumers’ personality can influence choice behavior. Considering disparities between food store brand market shares across countries, we investigate the impact of personality on food store brand decision making. We carried out two non-hypothetical choice experiments for milk, ice-cream, and cereal, one in France and one in Germany for a total of N?=?505 participants. Results show that in France neurotic and in Germany conscientious consumers purchase significantly less store brands for the food items in question. This study contributes to the literature by providing evidence that both, personality and country-effects, influence consumer food choice behavior and serve as a motivating factor for multi-category purchases of grocery store brands. 相似文献
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以玫瑰花预处理沉淀物、红枣浓缩汁、低聚果糖和赤藓糖醇为主要研究对象,以感官得分为评价指标,通过单因素试验和正交试验方法确定玫瑰红枣牛初乳冻干粉的最佳配方,并进一步测定玫瑰红枣牛初乳冻干粉对DPPH自由基、超氧阴离子自由基和对羟基自由基的清除率,评价玫瑰红枣牛初乳冻干粉抗氧化活性.结果表明,玫瑰花预处理沉淀物的最佳添加量为2.5%,红枣浓缩汁的最佳添加量为5%,低聚果糖的最佳添加量为7.5%,赤藓糖醇的最佳添加量为17.5%,因此,玫瑰红枣牛初乳冻干粉的最佳配方为玫瑰花174.8%,红枣浓缩汁5%,N-乙酰神经氨酸5%,透明质酸钠2%,胶原蛋白肽40%,弹性蛋白0.2%,雨生红球藻5%,低聚果糖7.5%,复配营养强化剂(维生素C+维生素E+烟酸+麦芽糊精)1%,赤藓糖醇17.5%,生鲜牛初乳138.8%.体外抗氧化试验得到玫瑰红枣牛初乳冻干粉对O2-、DPPH和·OH的清除率分别为77.41%、87.68%和57.13%,显著高于对照组(P<0.05),可见玫瑰红枣牛初乳冻干粉具有抗氧化活性,为深度开发牛初乳冻干粉新方向提供参考. 相似文献
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Didier Kadjo Jacob Ricker‐Gilbert Tahirou Abdoulaye Gerald Shively Mohamed N. Baco 《Agricultural Economics》2018,49(4):435-454
This article estimates how storage losses from mold, insects, and other pests, combined with liquidity constraints, influence a smallholder farm household's decision to store maize on farm after harvest. We analyze panel data from 309 smallholders in Benin covering the 2011 and 2013 harvest seasons. Results suggest that smallholders are driven to sell at harvest time for different reasons, depending on their motivation for storing. In households that report direct consumption as their primary goal for storing maize, liquidity constraints, not storage losses, reduce the amount they store. In contrast, households that store maize with the intention of selling it later in the year appear unaffected by liquidity constraints. Instead, these households store less when they expect to lose more during storage. These results suggest that policies to provide liquidity will be more helpful in motivating storage among consumption‐oriented households. Households motivated to store for later sale will benefit from modern storage technologies that mitigate the operational costs associated with storage losses. 相似文献
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为了探究"营养强化维生素AE"菜籽油中维生素A(VA)与维生素E(VE)的稳定性,本研究重点考察了高温加热、光照及烹饪对"营养强化维生素AE"菜籽油中VA、VE含量的影响情况。研究发现,高温加热对VA、VE的稳定性影响较大,温度越高、加热时间越长,损失率越大;光照条件下储存VA、VE均有明显损失,避光条件下几乎无明显变化;烹饪过程会导致VA、VE的流失,但低温短时烹饪过程中VA、VE的损失量是可控的。综上可知,"营养强化维生素AE"菜籽油在日常食用过程中最好选择避光储存,避免高温长时间加热,由此可以减少VA、VE的损失。 相似文献