茚三酮(宁希德林),一种有机化合物,被广泛用于检测氨、一级和二级胺,尤其是氨基酸。茚三酮与它们反应时产生深蓝色或紫色,称为罗曼紫(Ruhemann's purple)。法医学上这个反应被用于鉴定指纹。[2]
茚三酮反应(Kaiser鉴定)也可用来在固相接肽时检验脱保护基是否已经完成,[3] 鉴定和比色法分离氨基酸以及鉴定铵离子(呈紫色),机理如下图所示:
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