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pH区带精制逆流色谱法制备青风藤碱
广西地不容 青风藤碱 pH区带精制逆流色谱法
2012/3/21
采用pH区带精制逆流色谱法从广西地不容中制备青风藤碱，溶剂系统为石油醚乙酸乙酯甲醇水（3:7:1:9,V/V），上相加10 mmol/L三乙胺为固定相，下相加10 mmol/L盐酸为流动相。一次进样1.0 g，可得纯度为99.5%的青风藤碱600 mg，所得产物经ESI-MS，1H NMR和13C NMR进行结构鉴定。本方法效率高，制品纯度高，适合青风藤碱的大量制备。
The Effect of Ionic Electrolytes and pH on the Zeta Potential of Fine Coal Particles
Zeta potential cationic electrolytes anionic electrolytes
2010/4/8
Many environmental problems are attributed to coal combustion and utilization, a subject receiving increasing attention worldwide. Some of these problems could be minimized or even avoided if coal cle...