溶液稳定性问题?样品用前存于四度冰箱,由原来看不到杂质到能检出,前后两针差别就这样了。欧洲药典条件,重现出来的主峰宽四分钟,很明显有很多杂质没分开。 ... PHENOXYMETHYLPENICILLIN EP8.0 Related substances. Liquid chromatography (2.2.29). Dissolution mixture. To 250 mL of 0.2 Mpotassium dihydrogen phosphate R add 500 mL of water R, adjust to pH 6.5 with an 8.4 g/L solution of sodium hydroxide R and dilute to 1000 mL with water R.查看更多