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贝壳英银虫 (正式写手)
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茶多题目：茶叶中茶多酚的红外光谱分析 摘要：茶多酚是指茶叶中一大类组成复杂、分子量及其结构差异很大的多酚类及其衍生物混合物，主要由儿茶素、黄酮醇、花色素、酚酸及其缩酚酸等组成的有机化合物，以儿茶素为主的黄烷醇类化合物占茶多酚总量的60%一80%，其中含量最高的几种组分为L—EGCG(50%-60%)、L—EGC(15%-20%)、L—ECG(10%-15%)和L—EC(5%-10%)。除此之外还有黄酮、黄酮醇类；花青素、花白素类；酚酸及缩酚酸等。本实验利用傅里叶红外光谱仪大树茶茶叶中茶多酚进行光谱分析，结果表明该技术能够解析出儿茶素 中各主要基团在近红外波段的吸收特性，并且结合定标过程定量快速检测总儿茶素在茶多酚中的含量，分析结果在很大的样品浓度范围内给出了很高的精度。 关键词：茶多酚、儿茶素、近红外光谱 |
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武汉一心一译 
捐助贵宾 (著名写手)
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贝壳英: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 非常感谢 2015-04-30 16:17:54
贝壳英: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 非常感谢 2015-04-30 16:17:54
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Infrared Spectroscopic Analysis of Tea Polyphenols in Tea Abstract: Tea polyphenols, an organic compound extricated from tea, is a general class of mixture of polyphenols and derivative, which possesses complicated compositions as well as greatly varied molecular weights and structures. It is mainly composed of catechinic acid, flavonol, flower pigment, phenolic acids and depside, wherein, the flavanol compounds represented mainly by the catechinic acid accounts for 60%一80% of total content, and the groups with considerable high contents include L—EGCG(50%-60%)、L—EGC(15%-20%)、L—ECG(10%-15%)和L—EC(5%-10%). In addtion, the component of polyphenol include flavone and flavonols，anthocyanidin and leucoanthocyanidin,phenolic acid and depsides. In this experiment, using fourier infrared spectrometer, we conducted spectral analysis on the tea polyphenols extricated from arborescens tea, and the results show that the spectral analysis can parse out the absorption characteristics of major groups of catechinic acid in near-infrared band, and based on calibration process, we can quickly quantitate the content of total catechins in tea polyphenols. This analysis results achieved high accuracy within sample concentration range. Keywords: Tea Polyphenols; Catechins; Near Infrared Spectrum |
2楼2015-04-30 14:41:01