排序方式： 共有11条查询结果，搜索用时 15 毫秒
1.
2.
3.
4.
5.
The similarities of the non-linear chemical (NLC) fingerprints of Radix Glycyrrhizaes from four producing areas and eight other traditional Chinese medicines (TCMs) were calculated, using a systemic similarity
calculation method proposed and three other main calculation ones (Euclidean distance, correlation coefficient and included
angle cosine). All of the correlation coefficient similarities of different TCMs are higher than 0.952, and the included angle
cosines are all higher than 0.962. So, both the correlation coefficient and included angle cosine similarities are unable
to be used as the criteria for quantitatively evaluating the similarities of NLC fingerprints of TCMs. Although all of the
Euclidean distance similarities of Berry Liquorices from four producing areas are less than 73, those of the other eight TCMs are all more than 180. The Euclidean distance cannot
reflect the relative magnitudes of the feature differences in the NLC fingerprints very correctly. The systemic similarity
method is the best among the four ones. All of the systemic similarities of Berry Liquorices from the four producing areas are higher than 0.962, while those of the other eight TCMs are all lower than 0.805, and the
systemic similarity can reflect the differences between samples most faithfully, and can be used as a quantitative one evaluating
the similarities of NLC fingerprints of TCMs, by which TCM could be distinguished and evaluated quickly, simply and exactly. 相似文献
6.
The chemical components of the essential oils in the barks and leaves of Eucommia ulmoides Oliver were analyzed and compared by chromatograms and mass spectra technique, heuristic evolving latent projections (HELP),
alternative moving window factor analysis (AMWFA) algorithms and normalization method based on the peak areas; the flavones
in the barks and leaves of Eucommia ulmoides Oliver were separated on an ODS column by gradient elution carried out with the flow phase consisting of water, methanol
and phosphoric acid (0.1%), and their contents were quantitatively determined by standard curve method and diode array detection
(DAD) at 362 nm. The results show that 68 and 73 compounds respectively from essential oils of the barks and leaves of Eucommia ulmoides Oliver are identified, and there are 33 mutual compounds among 108 compounds determined. The total contents of these volatile
components of the two samples possess 92.9% and 97.75% of the gross of the relevant essential oils, respectively; the contents
of the rutin, quercetin and kaempferol in the barks and leaves of Eucommia ulmoides Oliver are 0.016 9, 0.003 6, 0.002 1 and 0.064 4, 0.030 2, 0.010 0 mg/g, respectively, and the determination recoveries are
95.2%–106.2%. The comparative analysis shows that for the barks and leaves of Eucommia ulmoides Oliver, there are significant differences in their components of the relevant essential oils and flavones.
Foundation item: Project(20235020) supported by the National Natural Science Foundation of China 相似文献
7.
8.
9.
10.