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°®ÓëÓêÏÂ(½ð±Ò+2): 2011-12-29 08:34:34
zivi(½ð±Ò+15, ·­ÒëEPI+1): ·Ç³£Ð»Ð» 2012-01-04 09:49:07
.. it is relatively stable below 350 ¡æ, after which the mass loss rate slowed down, and until  400 ¡æ, there was less oxidative decomposition and most of them had been oxidized.
the  following way had been taken to prepare the aim compounds:
" extraction in hot water ¡ú flocculation impurity¡ú ethanol macroporous resin desorption ¡ú  ion adsorption¡ú desalting by resin exchange  ¡ú ​​active carbon bleaching ¡ú ​​concentration ¡ú  spray-drying".
there are some advantages for this method: no need for recrystallization , the adsorption carried out by using HZ818 resin, a white powder-like product could be obtained by one step extraction with the total glycoside content of 90% or more. and a high performance liquid chromatography was used ....... mixture, by UV, FTIR and thermal gravimetric analysis (TGA) method, ....... physical and chemical analysis and detection were further carried out, which provided a significant guidance for the actual production.
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