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hmily601

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經(jīng)查閱相關(guān)參考文獻，當(dāng)只有一個鼠李糖基直接連在山奈酚的C-7或C-3位時，鼠李糖基的端頭氫信號化學(xué)位移約為5.2 ppm，根據(jù)化合物1的糖基端頭氫化學(xué)位移值及偶合常數(shù)，確定兩個鼠李糖基不可能直接連在山奈酚母體的C-7和C-3位，那就只有半乳糖直接連在山奈酚母體的C-7和C-3位上。在化合物1的碳譜上，6個糖基的端頭碳信號在化學(xué)位移100.1，100.7 ppm這兩處有重疊，糖基的C-2，C-3，C-4，C-5這四個位置的碳化學(xué)位移都集中分布在68.2-76.4 ppm，且在68.2-71.9 ppm出現(xiàn)嚴(yán)重重疊，鼠李糖上的甲基碳信號化學(xué)位移也非常相近（17.7ppm和17.9ppm）。因此，根據(jù)這六個糖基碳的化學(xué)位移分布情況及重疊情況，說明山奈酚母體C-7和C-3位上的糖鏈化學(xué)環(huán)境非常相像，經(jīng)過參考相關(guān)文獻[13-15]，確定山奈酚母體上C-7和C-3位所連的糖鏈?zhǔn)窍嗤�，糖鏈結(jié)構(gòu)為-半乳糖-半乳糖-鼠李糖。

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1樓 2011-12-11 22:52:48

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terry_well

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愛與雨下(金幣+2): 2011-12-12 08:35:01
hmily601(金幣+100, 翻譯EPI+1): 辛苦了�。。�！呵呵 2011-12-12 22:12:07

After checking the relevant references, when only one rhamnose base directly connected at the position of C-7 or C-3 in kaempferol molecule, the first hydrogen-based signal chemical shift for rhamnose was about 5.2 ppm. We could determine the two rhamnose base which can not be directly connected at the position of C-7 and C-3 in the mother of kaempferol according to the first hydrogen of sugar-based groups chemical shift values and coupling constants of the compound 1. Instead, it can only be directly connected at the position of C-7 and C-3 in galactose mother kaempferol. For C-NMR spectra of compound 1, there was two overlap for the chemical shift signal (100.1 and 100.7 ppm) for the ends carbon of the six glycosylation. In addition, the carbon chemical shifts at four positions of C-2, C-3, C-4, C-5 sugar-based groups are concentrated in the 68.2-76.4 ppm, and there was a severe overlap in the range of 68.2-71.9 ppm. Besides, the chemical shifts signal for methyl carbon of rhamnose is also very similar which are 17.7ppm and 17.9ppm. Thus, according to the condition of their chemical shift distribution and overlap for the six carbons in sugar-based groups, it was indicated that C-7 and C-3 position in kaempferol parent on the sugar chain was in a very similar chemical environment. It was further determined through the relevant literature [13-15] that the sugar chains connected at C-7 and C-3 bits of kaempferol parent are identical and the structure of such sugar chain should be galactose-galactose-rhamnose.

終于搞完了，都暈菜了。

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簽名:英文名“Terry”,EC版專用；中文名“漿糊哥”，灌水專用，謝謝合作！

2樓2011-12-12 01:02:53

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