强蛋白银及弱蛋白银的含量测定,中国药典及 B.P.(1958),B.P.C.(1954)都是采用烧灼破坏、灰化后,以硝酸溶解,硫酸铁铵作指示剂,再以硫氰酸铵滴定。这个方法的优点是,终点明显,易于观察,但操作繁复,时间很久,如在没有煤气设备的地点,工作上是存在一定困难的。国内外学者对蛋白银含量测定的简化手续,亦曾提出过改进方法,但据我们试验,因溶液大都具有较深颜色,终点不易控制。蛋白银含量测定的简化,问题在于溶液颜色是否能成为无色,因此我们进行了多次试验,最后以硫酸破坏蛋白质,再加硝酸酸化,这样终点明确,操作时间大为缩短,结果很好。兹将测定方法介绍于后:精密称取本品约0.5g,加蒸溜水10ml,溶解后, Strong protein silver and weak protein silver content determination, Chinese Pharmacopoeia and BP (1958), BPC (1954) are destroyed by burning, after ashing, dissolved in nitric acid, ammonium ferric sulfate as an indicator, and then ammonium thiocyanate Titration. The advantage of this method is that the end point is clear and easy to observe, but the operation is complicated and takes a long time. For example, there is a certain difficulty in work where there is no gas equipment. Scholars at home and abroad to simplify the determination of protein silver, have also proposed improvements, but according to our test, most of the solution has a dark color, the end is not easy to control. The problem with determining the silver content of a protein is that the color of the solution becomes colorless, so we conducted several tests, destroying the protein with sulfuric acid and then acidifying it with nitric acid. This gave us a clear end point and greatly reduced operating time with good results. We will measure the method introduced in the later: Precision Weigh this product about 0.5g, add distilled water 10ml, dissolved,