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麻黄碱与茚三酮在加热条件下能发生颜色反应，其反应产物在可见光区450～700nm间有一理想吸收峰（λmax＝567nm），该峰的一阶导数光谱526.8nm波长处的振幅值与麻黄碱的浓度呈良好的线性（r＝0．9999）且灵敏度较高（最低有效检出量为4μg／ml）、稳定性好（回收试验：x＝98．75％，RSD＝0．16％，n＝6）。
Ephedrine and ninhydrin can react with color under heating conditions. The reaction product has an ideal absorption peak (λmax=567 nm) in the visible region between 450 and 700 nm. The first derivative spectrum of this peak has an amplitude value at a wavelength of 526.8 nm. The concentration of ephedrine was well linear (r=0.9999) with high sensitivity (the minimum effective detection amount was 4 μg/ml) and good stability (recovery test: x=98.75%, RSD=0.16 %, n=6).