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baiyuefei版主 (文學泰斗)
風雪
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[求助]
藥分方面-液相檢查方法
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Related substances Liquid chromatography (2.2.29). Dissolution mixture To 250 mL of 0.2 M potassium dihydrogen phosphate R add 500 mL of water R and adjust to pH 6.5 with an 8.4 g/L solution of sodium hydroxide R. Dilute to 1000 mL with water R. Test solution (a) Dissolve 50.0 mg of the substance to be examined in the dissolution mixture and dilute to 50.0 mL with the dissolution mixture. Test solution (b) Prepare immediately before use. Dissolve 80.0 mg of the substance to be examined in the dissolution mixture and dilute to 20.0 mL with the dissolution mixture. Reference solution (a) Dissolve 50.0 mg of phenoxymethylpenicillin potassium CRS in the dissolution mixture and dilute to 50.0 mL with the dissolution mixture. Reference solution (b) Dissolve 4.0 mg of 4-hydroxyphenoxymethylpenicillin potassium CRS in the dissolution mixture and dilute to 10.0 mL with the dissolution mixture. Dilute 5.0 mL of this solution to 100.0 mL with the dissolution mixture. Reference solution (c) Dissolve 10 mg of phenoxymethylpenicillin potassium CRS and 10 mg of benzylpenicillin sodium CRS (impurity A) in the dissolution mixture and dilute to 50 mL with the dissolution mixture. Reference solution (d) Dilute 1.0 mL of reference solution (a) to 20 mL with the dissolution mixture. Dilute 1.0 mL of this solution to 50 mL with the dissolution mixture. Reference solution (e) Dilute 1.0 mL of reference solution (a) to 25.0 mL with the dissolution mixture. |
木蟲 (正式寫手)

木蟲 (正式寫手)
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有關物質 液相色譜法 (2.2.29). 溶解混合物至250 mL 0.2 M磷酸二氫鉀R ,加入500 mL水R,并利用8.4 g/L氫氧化鈉溶液R,調(diào)節(jié)pH 至6.5。 用水R稀釋至1000 mL。 待測溶液 (a)溶解50.0 mg待測物質于溶出混合液中,并用溶出混合液稀釋至50.0 mL。 待測溶液 (b) 現(xiàn)配現(xiàn)用。溶解80.0 mg待測物質于溶出混合液中,并用溶出混合液稀釋至20.0 mL。 參比溶液(a) 溶解50.0 mg青霉素V鉀CRS于溶出混合液中,并用溶出混合液稀釋至50.0 mL。 參比溶液(b) 溶解4.0 mg 4 - 羥基青霉素V鉀CRS于溶出混合液中,并用溶出混合液稀釋至10.0 mL。 利用溶出混合液將5.0 mL該溶液稀釋至100.0 mL。 參比溶液(c) 溶解10 mg青霉素V鉀CRS和10 mg青霉素鈉 CRS (雜質 A) 于溶出混合液中,并用溶出混合液稀釋至50.0 mL。 參比溶液(d) 利用溶出混合液將1.0 mL參比溶液(a)稀釋至20 mL。利用溶出混合液將1.0 mL該溶液稀釋至50.0 mL。 參比溶液(e) 利用溶出混合液將1.0 mL參比溶液(a)稀釋至25.0 mL 。 |

版主 (文學泰斗)
風雪
木蟲 (著名寫手)

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