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中地茶
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The contents of tea polyphenolic compounds, ascorbic acid, flavones and tea catechins in 17 kinds of Chinese tea were reported.In multivariable analysis, both factor analysis and regression technique were used to assess the realationship between blocking rate (transferred into In odd, dependent variable) and tea active constituents (independent variable) . It has been shown that the correlation coefficient between each pair of independent variables is comparatively high. One main factor could explain 80% of...

The contents of tea polyphenolic compounds, ascorbic acid, flavones and tea catechins in 17 kinds of Chinese tea were reported.In multivariable analysis, both factor analysis and regression technique were used to assess the realationship between blocking rate (transferred into In odd, dependent variable) and tea active constituents (independent variable) . It has been shown that the correlation coefficient between each pair of independent variables is comparatively high. One main factor could explain 80% of variation among independent variables, of which the factor loadings were 0.951 (tea catechins), 0.88 (tea polyphenolic compounds), 0.842 (ascorbic acid). It has been found that tea polyphenolic compounds had a higher contribution to the blocking rate. The blocking rates on NPRO formation were 88% for 2 ml green tea extract, 74% for tea polyphenolic compounds extracted from 2 ml green tea, and 75% for 20 mg of tea catechins, the same amount as contained in 2ml of tea extract. The blocking rate -was 28% for the same amount of ascorbic acid contained in 2 ml of tea extract, and therefore ascorbic acid in tea didn't play an important role in the blocking of NPRO formation. Tea polyphenolic compounds and tea catechin affected NPRO formation in the same manner as tea extract, i.e. inhibtion in higher level and promotion in lower level. Thus, it might be concluded that blocking effect on NPRO formation was mainly due to tea polyphenolic compounds especially tea catechin in tea.

首先通过对茶叶中可能影响N-亚硝化反应的物质(抗坏血酸、茶多酚、茶儿茶素,黄酮)进行测定,并与阻断能力进行简单相关和多元(相关、回归、主成分)分析,结果提示茶叶中以茶多酚作用为最大。而后,进行证实试验。结果:黄山毛峰(绿茶)水提取液2ml的阻断率为88%,2ml水提取液所含抗坏血酸的阻断率为28%,而水提取液中茶多酚阻断率为74%;相应量的茶儿茶素阻断率为75%,茶多酚及茶儿茶素对N-亚硝化反应的作用与茶叶水提取液相似,即高水平抑制,低水平促进。由此可以认为,茶叶中影响N-亚硝化反应的主要成分为茶多酚,尤为茶儿茶素。

Red,yellow and purple-blue films of polyvinyl chloride (PVC) were used to cover tea plants.The tea plants growing under the purple-blue film without green-yellow light had thicker leaves, especially thicker palisade tissue, higher content of chlorophyll and higher photosynthetic efficiency. In spring, under the 3 films, the content of polyphenols in the shoot increased conversely, the content of amino acid decreased. In summer, under the purple-blue film, the content of amino acid increased, and under the yellow...

Red,yellow and purple-blue films of polyvinyl chloride (PVC) were used to cover tea plants.The tea plants growing under the purple-blue film without green-yellow light had thicker leaves, especially thicker palisade tissue, higher content of chlorophyll and higher photosynthetic efficiency. In spring, under the 3 films, the content of polyphenols in the shoot increased conversely, the content of amino acid decreased. In summer, under the purple-blue film, the content of amino acid increased, and under the yellow film, the contents of both amino acid and polyphenols increased significantly.

用红、黄和蓝紫色膜覆盖茶树的滤光试验结果表明,滤除黄绿光的蓝紫色膜覆盖,能使茶树叶片,尤其是栅栏组织增厚,叶片的叶绿素含量增加,茶树的光合效率提高。春季,3种有色膜覆盖,新梢中茶多酚的比例及含量增加,氨基酸则反之;夏季,蓝紫色膜覆盖可以提高氨基酸的含量,而黄色膜则是同时显著提高氨基酸和茶多酚的含量。

The colorimetry for the quantitative determination of thea saponin was investigated,2%phloroglucinol-alcohol solution was used as developer,the wavelengths is 450nm,the HCl concentration can't be lower that 22% at the colour reaction, the hydrolytic time is 180 minutes, and the reaction temperature is 80℃. This method is characterized easy to operate, less reagent consumption and stable repeatability. Results showed that this method was suitable for the quantitative determination of thea saponin for laboratory...

The colorimetry for the quantitative determination of thea saponin was investigated,2%phloroglucinol-alcohol solution was used as developer,the wavelengths is 450nm,the HCl concentration can't be lower that 22% at the colour reaction, the hydrolytic time is 180 minutes, and the reaction temperature is 80℃. This method is characterized easy to operate, less reagent consumption and stable repeatability. Results showed that this method was suitable for the quantitative determination of thea saponin for laboratory and industry.

采用比色法对茶皂素的定量测定法进行了研究。以2%间苯三酚乙醇溶液作显色剂,比色波长为450毫微米,显色反应中盐酸含量大于22%,酸水解时间为180分钟,反应温度以80℃为宜。本法具有操作简便,消耗试剂量少和重现性强等特点,适用于实验室研究法和工业分析中茶皂素的定量测定。

 
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