Guangxi Normal University, Pakhoi, Guangxi Zhuangzu Zizhiqu, China

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Publications (2)1.05 Total impact

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    ABSTRACT: The methods of sequential analysis of dual-indexes and cluster analysis were utilized to investigate the infrared fingerprints of A. cantoniensis planted in different years and different places in Guangxi, China. The results showed that 6 samples were able to be completely separated only through 13 point smoothing, when the dual-indexes analysis was applied in the present research, and the accurate relationship between these samples could be inspected and expressed by quantitative relationships under 6-dimensional spaces; however, the effect of cluster was bad only through 13 point smoothing of raw spectra, and it was very difficult to find out the regular sequences while the cluster analysis was applied. Furthermore, the 6 samples were able to be completely separated if raw spectra were dealed with 1st derivative after 13 point smoothing, and the clustering effects were more obvious and 6 samples of A. cantoniensis were completely separated. The above two methods could be used to evaluate the quality of Chinese medicinal materials easily when the sample was not excessive quantitatively, but the method of dual-indexes analysis was more difficult than the clustering analysis if the sample size was too large, since a mass of data such as common peak ratio and variation peak ratio of the IR fingerprint spectra were processed and analyzed statistically, while this method could accurately find out the closest relationship between any samples through comparing the quantitative relationships of common peak ratio and variation peak ratio of each sample under 6-dimensional space; the precision of cluster analysis was less than dual-indexes analysis, but it was more convenient than dual-indexes analysis when large sample data were analysed. Finally the above two methods all showed that the chemical composition of the A. cantoniensis was similar in the same cultivated area, but the difference in chemical composition of A. cantoniensis in different years was distinct even they were in the same place.
    No preview · Article · Jan 2010 · Guang pu xue yu guang pu fen xi = Guang pu
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    ABSTRACT: Raman tweezers is a new optical technique that combines laser tweezers with Raman spectroscopy, which has the capability of studying single biological cells or organelles in nearly natured solution. Owing to its characteristics of noncontact, noninvasion, fast identification, and real-time detection, it has found application in improving the Signal Noise Ratio of Raman spectroscopy, optimizing the detection and sorting single cells or organelles, practicing the real-time detection of biochemistry dynamics process so as to make the activity and mechanisms of biomolecules understood deeply. The source, principle of Raman tweezers, and its optical application in biology are depicted and reviewed particularly in this article.
    Preview · Article · May 2009 · Chinese Journal of Analytical Chemistry