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总的氨基酸含量 游离氨基酸含量 氨基氮含量 总氮含量的区别?
2.5.8 Determination of primary aromatic amino-nitrogen芳伯氨基氮的测定Dissolve the prescribed quantity of the substance to be examined in 50 ml of dilute hydrochloric acid R or in another prescribed solvent and add 3 g of potassium bromide R. Cool in ice-water and titrate by slowly adding 0.1 M sodium nitrite with constant stirring. Determine the end-point electrometrically or by the use of the prescribed indicator.将规定数量的待测样品溶于50ml稀盐酸或其它规定的溶剂中,加3g溴化钾。在冰浴中冷却后用0.1M的亚硝酸钠滴定液慢速滴定,随滴随搅拌。采用电位法或规定的指示剂指示终点。
(2S,3S)-3-氨基-2-甲基-4-氧代氮杂环丁烷-1-磺酸(2S,3S)-3-amino-2-methyl-4-oxoazetidine-1-sulfonic acid谁有这个液相的检测纯度的方法,是氨曲南的起始物料N-氮杂环丁烷???