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Study on Purifying Technology of Andrographolide by Supercritical CO_(2) Secondary Gradient Crystallization 被引量:2
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作者 ZHANGWen-cheng PANJian 《Agricultural Sciences in China》 CAS CSCD 2004年第11期849-855,共7页
The effects of the secondary gradient crystallizing pressure, temperature and time on the purity and crystallization ratio of andrographolide were investigated via single factor experiments. The shape of crystal was... The effects of the secondary gradient crystallizing pressure, temperature and time on the purity and crystallization ratio of andrographolide were investigated via single factor experiments. The shape of crystal was observed with scanning electron microscopy (SEM). The purity of andrographolide was determined by high pressure liquid chromatography (HPLC). It was found that the optimized parameters were pressure 14 MPa, temperature 55℃, time 60 min, and CO2 flow rate 15 L min-1, under these conditions the particle of andrographolide was much smaller, the crystal of andrographolide was distributed in floccule on crystal board,with the purity of andrographolide 92.5%, the crystallization ratio 48.9%. 展开更多
关键词 Supercritical CO2 Secondary gradient crystallization ANDROGRAPHOLIDE Scanning electron microscopy (SEM) High pressure liquid chromatography (HPLC)
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