共查询到20条相似文献,搜索用时 93 毫秒
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复合护色液对鲜切牛蒡的防褐变研究 总被引:1,自引:0,他引:1
研究了影响鲜切牛蒡护色效果的因素,在单因素试验的基础上进行正交试验,通过感官评定来确定最佳护色工艺。试验结果表明,单一的0.6%抗坏血酸、1.0%柠檬酸和1.0%的亚硫酸氢钠处理均能很好地抑制鲜切牛蒡褐变,三种护色剂对护色效果的影响顺序为亚硫酸氢钠>柠檬酸>抗坏血酸;在考虑护色时间和料液比的基础上,通过L9(34)正交试验,确定了鲜切牛蒡的最佳护色组合为A1B3C3,即0.4%抗坏血酸、0.8%柠檬酸、0.15%亚硫酸氢钠按1:2的料液比浸泡30 min,可以有效地防止鲜切牛蒡加工过程中的褐变。 相似文献
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在全藕粉的生产过程中,通过单因素实验和正交实验确定防止鲜切藕片褐变的护色剂组合。研究结果表明:当护色液组成为柠檬酸0.15%,抗坏血酸0.15%,DL-苹果酸0.25%,L-半胱氨酸0.15%时,其护色效果优于护色效果较好的含硫护色剂,而组合护色剂不含硫,对人体无害,更符合现代食品安全的要求。 相似文献
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柠檬酸亚锡二钠(DSC)是一种新型护色剂。将DSC用于鲜切莲藕预处理阶段,抑制莲藕多酚氧化酶活力及褐变,探讨影响DSC对鲜切莲藕片护色作用的因素,并与其他常用护色剂的护色效果进行对比。结果表明:DSC对鲜切藕产品低温保藏期间的褐变和多酚氧化酶活力都有很好的抑制作用,在pH 3~6条件下用0.05%~0.2%DSC浸泡液处理15min后,鲜切藕产品可保持较低的褐变度和多酚氧化酶活力,同时在4℃、20d内DSC的护色效果稳定;与其他常用护色剂比较,在0.1%的等量护色剂浓度下,DSC护色效果优于柠檬酸、抗坏血酸、异抗坏血酸钠,与亚硫酸氢钠效果相当。 相似文献
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为有效解决兰州百合干制过程的褐变问题,开发兰州百合干无硫护色技术,选取护色剂抗坏血酸、柠檬酸、L-半胱氨酸、氯化钠为影响因子,以百合干色泽(L*值)为响应值。在单因素试验的基础上,采用Box-Behnken试验设计构建二次多项式回归方程的模型,进行响应面分析。结果表明:护色剂复合作用对百合干色泽的影响程度依次为:L-半胱氨酸>抗坏血酸>氯化钠>柠檬酸,复合护色剂的最优配方(质量分数)为:0.65%氯化钠、0.3%抗坏血酸、0.3% L-半胱氨酸、0.8%柠檬酸,在此条件下,加工的百合干色泽L*值为78.69,护色效果好。 相似文献
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The article gives a brief account of the main streamlines and scope of scientific activities of Department of Preventive Medicine of RAMS for the recent 10 years. 相似文献
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目的 分析食用油中酸价测定的不确定度来源并建立不确定度评定方法, 为检验数据的可靠性和准确性提供参考。方法 依据GB 5009.229-2016《食品安全国家标准 食品中酸价的测定》和JJF 1059.1-2012《测量不确定度评定与表示》建立数学模型, 计算各变量的不确定度, 最终计算扩展不确定度。结果 结果显示, 样品中酸价的扩展不确定度为U=1.764×10?3 mg/g, 样品中酸价含量为(0.16±0.002) mg/g(置信水平95%, 包含因子k=2)。结论 在测定过程中, 测量重复性对总的不确定度影响最大, 其次是滴定管的体积。 相似文献
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有梭织机稀密路织疵成因分析 总被引:4,自引:1,他引:3
从有梭织机打纬过程中织机构件的位置和状况对纬纱之间距离的影响出发,推导出纬向密度计算公式,直观分析了影响纬向密度的各种因素,提出了为减少稀密路织疵在国产老织机上采取的几项改进措施:采用弹簧回综、机外送经、电子驱动、导布辊加压等装置。 相似文献
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脂肪酸聚甘油酯(Polyglycerol esters of fatty acids,简写为PGE)在常温下有半固态和固态两种存在状态,本文通过对分别添加这两种PGE的软冰淇淋基料进行粘度、pH、粒径分析和垂直扫描分散稳定性分析(Turbiscan),发现半固态PGE的添加量为0.2%时,乳状液的粘度最低,粒径最小,稳定性最好;固态PGE的添加量为0.4%时.乳状液的粘度最低,粒径最小.通过比较发现,两种PGE对基料的影响有很大差别:半固态PGE能使乳状液的粒子更小,并能有效延长乳状液的稳定性;而固态PGE由于其熔点较高,可以促进脂肪结晶. 相似文献
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《Journal of dairy science》1987,70(2):331-336
Exact relationships of quadratic forms for restricted maximum likelihood and the pseudo expectation methods were presented for balanced data and a model containing only one random factor. These relationships were extended to unbalanced data as approximations and schemes for improving the convergence rates of the two methods of variance component estimation were compared empirically using simulated data. The proposed scheme for restricted maximum likelihood was found inappropriate since it converged rapidly but to a different final estimate than usual restricted maximum likelihood. The scheme for the pseudo expectation method also converged rapidly and to the same final estimates as the usual pseudo expectation method, and hence is recommended as a means of obtaining a good prior for restricted maximum likelihood. 相似文献
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The feeding behavior of students of Peoples Friendship University of Russia from 55 countries (557 persons) was studied by questionary method. Most students (83%) recognized the changes in nutrition after admission to the university. A quarter of students noted the ill health. The adaptation to the new nutrition type of at 12% per a year of study. About third (31%) rated their nutrition as good, 39%--as satisfactory, 20%--unsatisfactory at the moment of research. 80% of students broke a diet. About half of students (51%) regularly miss a breakfast, 34% and 15%--miss a dinner and supper. More than 60% of students eat hot meals not oftener than once a day. Insufficient consumption of fish, eggs and bean by students also was noted in the course of research. Irrationality of the educational schedule and the high prices for foodstuffs are leading causes of breaking of nutrition according to students. 相似文献