[IR-fingerprinting ordination comparison on different organs of three species of isodon]

The plants of the genus Isodon are of important medicinal values, being widely used in the production of the Chinese traditional and herbal drugs. Compared with the other identification methods, the identification of the Chinese traditional and herbal drugs using the fourier-transform infrared spectrometer with OMNI collector is simple and convenient, fast and accurate. Moreover, the extraction or break of the samples are not necessary in the identification using OMNI collector. In the present paper, fourier-transform infrared spectrometer with OMNI collector is applied to gain the IR-fingerprintings of eleven samples of Isodon inflexus, I. Lophanthoides and I. Macrocalyx. Based on the indices of wavenumber-absorbance, the differences of eleven IR-fingerprintings are compared by PCA (Principal Component Analysis). The results show that it is practical to apply PCA on the basis of IR-fingerprinting to compare the chemical differences of plant samples.