Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10564645 | Vibrational Spectroscopy | 2011 | 6 Pages |
Abstract
Ginseng is a precious traditional Chinese herbal medicine. Different parts of ginseng are deemed to have different medicinal values and properties. Rapid and non-destructive methods, such as diffuse reflectance near-infrared spectroscopy (DR-NIR), Fourier transform infrared spectroscopy with attenuated total reflectance (ATR-FTIR), were used to evaluate the differences of epidermis, phloem and xylem in ginseng, respectively. Samples were grounded into 200-mesh fine powder or cut into slices with about 2Â mm thickness for DR-NIR and ATR-FTIR spectra measurement, respectively. To explore the classifications between different parts of ginseng, the spectra of DR-NIR and ATR-FTIR were pretreated to calculate first derivative and then was analyzed with principal component analysis (PCA). The PCA results of DR-NIR spectra indicate that epidermis and xylem part of ginseng have distinct difference, and even different positions of epidermis or xylem part show regular and gradual differences. ATR-FTIR spectra directly show that three parts of ginseng are different at 2920, 2852, 1736 and 925.7Â cmâ1 peaks, especially for epidermis of ginseng. The PCA results of ATR-FTIR spectra yield clear classifications of the three parts of ginseng.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Yanhong Wu, Yi Zheng, Qingqing Li, Jibran Iqbal, Lingyi Zhang, Weibing Zhang, Yiping Du,