共查询到19条相似文献,搜索用时 78 毫秒
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以蚕蛹、棉饼、毛发等农副产品的废弃物为原料经酸性水解,可精制成复合氨基酸铜衍生物。通式为(?)(R=R′或R≠R′)。此类化合物具有较好的杀菌活性。本文建立了H_2S破络分离、茚三酮比色测定此类药剂中总氨基酸的方法。简便、快速、准确。 相似文献
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紫荆花红色素的提取及其性能测试 总被引:9,自引:0,他引:9
本文首次报道紫荆花红色素的提取方法及其各项性能的测试结果,并与玫瑰茄红色素作对比研究,证实同属于花青甙类化合物。又经急性毒性试验证明其毒性极低,故紫荆花天然红色素具有开发利用的价值。 相似文献
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电位滴定法测定食品中游离氨基酸 总被引:1,自引:0,他引:1
应用电位滴定法测定食品中游离氨基酸的含量,其仪器设备简单,操作方便,快捷,利用pH的变化确定滴定终点,无需指示剂,不受溶液色泽影响,从而提高了准确度,回收率达95%以上 相似文献
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废料中氨基酸组分的测定及利用初探 总被引:1,自引:0,他引:1
采用异硫氰酸苯酯(PITC)柱前衍生,反相高效液相色谱法即PICO-TAG方法测定了三种废料中的氨基酸,将其组成与四种粮食产品的氨基酸组成进行了比较分析,通过与FAO/WHO(联合国粮农组织/世界卫生组织)氨基酸构成模式相比较,认为这些废料可被开发利用,并对其氨基酸提取液的利用进行了初步探讨。 相似文献
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Determination of Nutritional and Cyclopropenoid Fatty Acids in Cottonseed by a Single GC Analysis 总被引:1,自引:0,他引:1 下载免费PDF全文
Barb Mitchell Brent Rozema Thomas Vennard Jane Sabbatini 《Journal of the American Oil Chemists' Society》2015,92(7):947-956
Historically, a complete analysis of cottonseed fatty acids required two separate analyses: gas chromatography (GC) for nutritional fatty acids and a separate analysis for cyclopropenoid fatty acids (CPFA). Using base esterification and optimized GC conditions, the method presented combines both analyses into a single GC procedure that improves analytical processes and streamlines workflow. While there were challenges, the resolution of critical pairs malvalic/stearic and dihydrosterculic/alpha linolenic methyl esters were adequately separated, allowing for accurate quantitation. Single lab reproducibility measurements (RSD) for major nutritional fatty acids ranged from 0.7 to 2.0 %. For CPFA the RSD ranged from 1.1 to 5.4 %, with the higher variability seen in the extracted cottonseed. In oils, the precision was similar between nutritional fatty acids and CPFA at equivalent concentrations, indicating the variation comes from the extraction process. Average spiked recovery results ranged from 93.3 to 106.5 % for selected fatty acids. In addition, complete fatty acid profile results compare favorably with other methodologies and historical data, demonstrating that it is possible to combine two legacy methods into one. 相似文献
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Joyce Beare-Rogers 《European Journal of Lipid Science and Technology》1988,90(3):85-88
Fatty acid composition is nutritionally important in countries with a high intake of dietary fat. The (n-3) and (n-6) families of essential fatty acids must both be represented in the diet, but controversy exists about the relative amounts that should be ingested. Safe ranges of intake that would prevent both deficiency signs and deleterious excesses of these fatty acids have yet to be established. 相似文献