原文由 afbunny 发表:
原文由 happyjyl 发表:
The test or tests that constitute the "Second identification" may be used for identification provided it can be demonstrated that the substance or preparation is fully traceable to batch certified to comply with all the other requirements of the monograph.
若该物质或制剂完全可追溯、并可以证明该产品符合个论中其它所有规定,则可以采用第二鉴别。
字面这样翻译完全正确,谢谢斑竹的精准翻译!另一个问题是如何理解,如何选择?
欧洲药典上对于很多物料的鉴别都有分first identification, second identification。first identification一般都是仪器方法,例如红外,液相、气相等,通过与对照品比对来得到结果,所以是一个普遍的适用方法。而second identification一般是化学方法组成的一套实验,每一个小的鉴别来鉴别该物料的一个或几个基团。这种情况下,可能就没有办法鉴别出来的情况(如同分异构体),这时,需要再附加其他的实验予以确认。我在制订质量标准的时候只选first identification的检验项目,我认为已经足够。希望能够听听大家对这个问题的理解。谢谢!
请看下面一段EP6.0上关于酒精(96%)专论中的鉴别:其中相对密度的鉴别既是First identification,又是Second identification!
ETHANOL (96 PER CENT)
Ethanolum (96 per centum)
DEFINITION
Content :
— ethanol (C2H6O; Mr 46.07) : 95.1 per cent V/V (92.6 percent m/m) to 96.9 per cent V/V (95.2 per cent m/m)
at 20 °C, calculated from the relative density using the alcoholimetric tables (5.5),
— water.
IDENTIFICATION
First identification: A, B.Second identification: A, C, D.A. It complies with the test for relative density (see Tests).
B. Infrared absorption spectrophotometry (2.2.24).Comparison : Ph. Eur. reference spectrum ethanol(96 per cent).
C. Mix 0.1 ml with 1 ml of a 10 g/l solution of potassium permanganate R and 0.2 ml of dilute sulphuric acid R
in a test-tube. Cover immediately with a filter paper moistened with a freshly prepared solution containing
0.1 g of sodium nitroprusside R and 0.5 g of piperazine hydrate R in 5 ml of water R. After a few minutes, an
intense blue colour appears on the paper and becomes paler after 10-15 min.
D. To 0.5 ml add 5 ml of water R, 2 ml of dilute sodium hydroxide solution R, then slowly add 2 ml of 0.05 M
iodine. A yellow precipitate is formed within 30 min. General Notices