In the paper, using the method of Lagrange interpolation five formulas, the second derivative written is obtained from XRD （X-ray diffraction） spectrum graph of MATLAB. Methodology of XRD SD （X-ray diffraction seco...In the paper, using the method of Lagrange interpolation five formulas, the second derivative written is obtained from XRD （X-ray diffraction） spectrum graph of MATLAB. Methodology of XRD SD （X-ray diffraction second derivative） was adapted to extract low frequency signal from original XRD patterns of traditional Chinese medicine. The results indicated that the XRD SD fingerprints obtained had obvious peak with sharp profile, which could distinctly embody the digital characteristics of different Meconopsis. Otherwise, the results also showed that XRD SD fingerprints might be a promising method for identification and quantity control for traditional Chinese medicine and could effectively solve the problem of XRD spectrum analytical dispersion type plant medicine and had a function of magnifying glass.展开更多
文摘In the paper, using the method of Lagrange interpolation five formulas, the second derivative written is obtained from XRD （X-ray diffraction） spectrum graph of MATLAB. Methodology of XRD SD （X-ray diffraction second derivative） was adapted to extract low frequency signal from original XRD patterns of traditional Chinese medicine. The results indicated that the XRD SD fingerprints obtained had obvious peak with sharp profile, which could distinctly embody the digital characteristics of different Meconopsis. Otherwise, the results also showed that XRD SD fingerprints might be a promising method for identification and quantity control for traditional Chinese medicine and could effectively solve the problem of XRD spectrum analytical dispersion type plant medicine and had a function of magnifying glass.
