AROMATIC nitro compounds have previously been detected on paper chromatograms by reduction, diazotisation and coupling with a phenol1 as this method has not been found satisfactory for 2:4-dinitrophenyl derivatives, for example, 2:4-dinitro-phenyl-amino-acids, two other methods which can be used in the presence of free amino-acids have been devised in addition to that of Grassmann and Riedel2.

中文翻译：

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在纸上色谱图上检测 2:4-二硝基苯基氨基酸

芳香族硝基化合物以前通过还原、重氮化和与苯酚偶联在纸色谱图上检测到，因为该方法对 2:4-二硝基苯基衍生物（例如 2:4-二硝基-苯基-氨基酸）不满意，除了 Grassmann 和 Riedel2 的方法外，还设计了两种可在游离氨基酸存在下使用的方法。