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6-aminopenicillanic acid (6-APA) crystals obtained under different physical and chemical conditions of the solutions may present different habits. The habits of diamond-shaped plates are desirable compared with other habits of 6-APA crystals. To obtain ideal 6-APA crystals, the effects of the mixed solvents and additives on 6-APA crystal habits were investigated. Ethanol or acetone was used as the organic solvent, and impurities existing in the ,6-APA purification process were used as the additives. 6-APA growth habits were changed when the concentrations of ethanol, acetone or phenyl acetic acid were increased to exceed their critical concentration. The observed results show that the dominant face on 6-APA crystals was identified to be , {020}, but the overall habit was controlled by the relative growth rates of the : 101 and {002} faces. Crystal growth rates and habits can be appreciably changed by specific adsorption of additives on crystal faces. In some cases solvent molecules can act in a similar way and may be regarded as bulk additives. The effects of additives and organic solvents on 6-APA crystal habits were the results of adsorption effect,which fitted the experimental results quite well. 相似文献
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采用高效液相色谱法对6-APA中残余苯乙酸、青霉素G含量进行了测定.经验证,此方法具有较强的专属性,苯乙酸、青霉素G测量的线性范围分别为0.000 499 7～0.013 991 6 mg/mL和0.000 501 3～0.014 036 4mg/mL;苯乙酸的回收率为99.91%,青霉素G的回收率为85.86%;苯乙酸、青霉素G的定量限分别为0.003 198mg/mL和0.001 004 mg/mL,检出限分别为：0.000 301 2 mg/mL和0.000 959 4 mg/mL. 相似文献
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