ABSTRACT
<p><b>OBJECTIVE</b>To establish an FTIR method for the analysis of Dendrobium.</p><p><b>METHOD</b>Using fourier transform infrared spectrometer to record the characteristic spectra of eleven samples of Dendrobium, and to compare the spectra by PCA (principal component analysis).</p><p><b>RESULT</b>The FTIR spectra of the upper part of the stem displayed significant differences between fresh and dried samples of Dendrobium. On the other hand, differences were observed in the spectra of the middle and lower parts of stems of D. guangxieuse when compared to other species.</p><p><b>CONCLUSION</b>The method of applying PCA to FTIR analysis is a rapid and dependable method for comparing samples of Dendrobium.</p>
Subject(s)
Dendrobium , Chemistry , Classification , Plant Stems , Chemistry , Plants, Medicinal , Chemistry , Classification , Principal Component Analysis , Methods , Spectroscopy, Fourier Transform Infrared , MethodsABSTRACT
<p><b>OBJECTIVE</b>To establish a method to determine Vitamin C in the Vc Yinqiao Tablets.</p><p><b>METHOD</b>Diffuse Reflectance in FTIR was used to determination of Vitamin C in the Vc Yinqiao tablets.</p><p><b>RESULT</b>The content of Vitamin C could be obtained directly, and the relationship between the absorbance and the concen tration was linear. The average recovery rate of Vitamin C was 98.69%, and RSD was 0.33%.</p><p><b>CONCLUSION</b>The method is simple, accurate and reliable, which may well be used for the determination of Vitamin C in the Vc Yinqiao Tablet.</p>