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常见的菸酸片的化学定量法,多系手续繁复,操作费时。现经实验后,提出较简便的改良方法如下:精密称取约相当于0.2克菸酸的片剂粉末,加新沸的热水50ml,摇匀,放冷,加2滴酚酞为指示剂,以0.1N 氢氧化钠溶液滴定。1ml 0.1N NaOH≡0.01231g C_6H_5O_2N经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,进行比较,结果如下表:讨论:(1)中国药典法手续繁复,所用试药仪器较多,全
Common niacin tablets chemical quantitative method, more complicated procedures, the operation time-consuming. Now after the experiment, put forward a more simple method of improvement are as follows: Precision weighing approximately equivalent to 0.2 grams of nicotinic acid tablet powder, add boiling water 50ml, shake, let cool, add 2 drops of phenolphthalein as an indicator, Titration with 0.1N sodium hydroxide solution. 1ml 0.1N NaOH ≡ 0.01231g C_6H_5O_2N Using a Shanghai factory nicotinic acid tablets, according to the Chinese Pharmacopoeia 1953 version of the British Pharmacopoeia 1958 version and the method of comparison, the results are as follows: Discussion: (1) Chinese Pharmacopoeia procedures Complex, more reagents used, all