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我做的注射用胞磷胆碱钠成品含量和有关物质时候,由于对照品干燥后放置时间过长有3个小时左右做出来结果不合,第二次对照品干燥后马上实验,发现对照品峰值有明显不同,放置时间长的有明显下降,对照品(140675-200803)储存条件是遮光阴凉干燥处,用前要105℃干燥4小时,是否降解,请高人帮忙看看
胞磷胆碱钠2005版鉴别的翻译:原文(1)取本品约10mg,加无水乙醇1ml使溶解,加碘化钾试液2ml与稀硫酸4ml,摇匀,加淀粉指示液数滴,溶液即显蓝紫色。(2)取本品的氯仿溶液(1→10)3~4滴,待氯仿挥发后,加2%香草醛硫酸溶液1滴,即显红色,放置,渐变棕色。(3)取本品,精密称定,加氯仿制成每1ml中含20mg的溶液,依法测定旋光度(附录Ⅵ E),应显右旋光性。翻译如下:1.Transfer the sample about 10mg , dissolve in anhydrous alcohol 1ml, then add potassium iodide solution 2ml and dilute sulfuric acid 4ml ,and mix , add the starch indicator several drops, the color of solution is Blue purple2. Transfer the sample of chloroform solution 3 to 4 drops, after chloroform to be volatile, add 2% Vaniilin sulfate Solution 1 drop. The color of solution is red, place the solution, the color gradual change palm. 3. Transfer the sample, accurately weighted. Add chloroform to make the solution about 20mg per ml, according to CP 2005, determinate the rotation. It should show right optical rotation.
询问下各位,《GB 5413.20—2013婴幼儿食品和乳品中胆碱的测定》中提到的胆碱酒石酸氢盐标准品在哪里能买到。问了好多地方,包括sigma的得到的答复都是试剂级别的,不是标准品。