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中国药典1977年版对盐酸普鲁卡因注射液规定了对氨基苯甲酸(PABA)限度检查,其方法是以目视法将样品提取液与对照比色液显色后,比较其黄色“不得更深”作为判断标准。该法(下称药典法)误差较大,特别是样品中PABA含量接近对照液浓度(1.2ppm)时,难于作出正确判断。为此,我们采用721型分光光度计,测定比色液体的吸收度进行比较,所判定的结果较药典法可靠,现介绍如下。 1.吸收波长的选择:按药典法制备对照比
Chinese Pharmacopoeia 1977 edition of procaine hydrochloride injection provides para-aminobenzoic acid (PABA) limit check by the visual method of the sample extract and the control colorimetric color, compared to the yellow Deeper "as a criterion. The law (hereinafter referred to as Pharmacopoeia) error, especially when the sample PABA concentration close to the control solution concentration (1.2ppm), it is difficult to make a correct judgment. To this end, we use 721 spectrophotometer, determination of the absorption of colorimetric liquid for comparison, the results determined by pharmacopoeia reliable, are as follows. 1. Absorption wavelength of choice: according to the pharmacopoeia preparation of control ratio