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首页> 外文期刊>Tetrahedron >Laccase-catalyzed conversion of green tea catechins in the presence of gallic acid to epitheaflagallin and epitheaflagallin 3-O-gallate
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Laccase-catalyzed conversion of green tea catechins in the presence of gallic acid to epitheaflagallin and epitheaflagallin 3-O-gallate

机译:没食子酸存在下漆酶催化的绿茶儿茶素转化为表皮鞭毛蛋白和3-O-没食子酸酯

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摘要

Green tea extract containing catechin mixtures was treated with gallic acid using laccase (EC 1.10.3.2) to improve its function as a food material. After enzymatic oxidation, two new products were detected on an HPLC chromatogram. These products were purified by extraction with ethyl acetate, sequential column chromatographies, and crystallization. On the basis of ~1H/~(13)C NMR, MALDI-TOF/high resolution MS, and UV–visible absorption spectral analyses, they were confirmed to be epitheaflagallin (5) and epitheaflagallin 3-O-gallate (6). This enzymatic process allows us to preferentially convert catechin derivatives in a crude mixture of green tea into different compounds.
机译:使用漆酶(EC 1.10.3.2)将没食子酸混合物中的含有儿茶素混合物的绿茶提取物进行了处理,以提高其作为食品原料的功能。酶氧化后,在HPLC色谱上检测到两种新产物。通过用乙酸乙酯萃取,顺序柱色谱法和结晶纯化这些产物。根据〜1H /〜(13)C NMR,MALDI-TOF /高分辨率MS和紫外可见吸收光谱分析,证实它们为上皮鞭毛蛋白(5)和上皮鞭毛蛋白3-O-没食子酸酯(6)。这种酶促过程使我们能够优先将绿茶粗混合物中的儿茶素衍生物转化为不同的化合物。

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