Its ninhydrin reaction was negative, but after acid hydrolysis, its ninhydrin reaction and biuret reaction were positive.
2
并用红外光谱、水合茚三酮反应、含氮量分析等方法验证接枝反应的进行。
The proof of grafting was established by IR spectra, ninhydrin test, nitrogen estimation and other analytical methods.
3
表面的伯胺基在与茚三酮反应后转化为醛基,通过银镜反应证明了醛基的存在。
The surface amino group was transferred to the aldehyde group after it reacted with ninhydrin. The surface aldehyde group was confirmed by the mirror reaction.