利用茚三酮法、钼蓝法及土壤双向切片法。
The methods of ninhydrin and molybdenum blue, and bi directional soil section slicing were used.
氨基酸层析分析时，将显色剂茚三酮直接溶于展开剂中。
Developer was combined with spray reagent in amino acid chromatography analysis.
茚三酮反应呈阴性，用酸水解后茚三酮反应和双缩脲反应呈阳性。
Its ninhydrin reaction was negative, but after acid hydrolysis, its ninhydrin reaction and biuret reaction were positive.
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