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常見的菸酸片的化学定量法,多系手續繁复,操作費时。現經实驗后,提出較简便的改良方法如下: 精密称取約相当于0.2克菸酸的片剂粉末,加新沸的热水50 ml、摇匀,放冷,加2滴酚酞为指示剂,以0.1N氢氧化钠溶液滴定。1 ml 0.1 N NaOH三0.01231 g C_6H_5O_2N 經用上海某厂产品菸酸片,按中国药典1953版法、英国药典1958版法及本文方法,进行比較,結果如下表: 讨论: (1) 中国药典法手續繁复,所用試药仪器较多,全
The chemical quantification method of common niacin tablets is complicated and time-consuming. After the experiment, a simpler improvement method is proposed as follows: Accurately weigh about the equivalent of 0.2 grams of niacin tablet powder, add 50 ml of fresh boiling hot water, shake well, let cool, add 2 drops of phenolphthalein as indicator Titrate with 0.1N sodium hydroxide solution. 1 ml 0.1 N NaOH III 0.01231 g C_6H_5O_2N The niacin tablets from a certain factory in Shanghai were used for comparison according to Chinese Pharmacopoeia 1953 edition, British Pharmacopoeia 1958 edition and this article. The results are as follows: Discussion: (1) Chinese Pharmacopoeia Law The procedures are complicated and there are many reagents used, all