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Â¥: Originally posted by terry_well at 2011-12-12 00:00:44:
According to the law of displacement for flavonoid O-glycoside daidzein glycosides¡­         
According to the literature [3], the glycosides for hydroxyl of sugar occur will induce a low-field sh ...

4.5 galactose  Â£Â¬ ӦΪ4 galactose £¬galactose ±¾ÉíÊǰëÈéÌǵÄÒâ˼£¬ºÙºÙ¡£
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hmily601(½ð±Ò+50, ·­ÒëEPI+1): лл ÐÁ¿àÄãà¶£¡£¡ 2011-12-12 00:13:29
According to the law of displacement for flavonoid O-glycoside daidzein glycosides¡­         
According to the literature [3], the glycosides for hydroxyl of sugar occur will induce a low-field shift for the carbon atoms connected to ¨COH groups and the chemical shifts for C-6 of galactose was about 62.0ppm before glycoside. Based on the 12C-NMR of compound 1, it was shown that there were four chemical shifts namely 65.4, 66.9, 68.0 and 69.9 ppm. Such signal mentioned above was obviously in the low-field, which was changed to low-field by +4 to +6 units compared with the C-6 chemical shifts for galactose before glycosides. This might correspond to the signal of a 4.5 galactose C-6. According to the above analysis, it was confirmed that C-6 bits of 4.5 galactose had changed into glycosides.
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2Â¥2011-12-12 00:00:44
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