Publications by authors named "Wanshun Zhao"

4 Publications

  • Page 1 of 1

Growth of Hexagonal Columnar Nanograin Structured SiC Thin Films on Silicon Substrates with Graphene-Graphitic Carbon Nanoflakes Templates from Solid Carbon Sources.

Materials (Basel) 2013 Apr 16;6(4):1543-1553. Epub 2013 Apr 16.

Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.

We report a new method for growing hexagonal columnar nanograin structured silicon carbide (SiC) thin films on silicon substrates by using graphene-graphitic carbon nanoflakes (GGNs) templates from solid carbon sources. The growth was carried out in a conventional low pressure chemical vapor deposition system (LPCVD). The GGNs are small plates with lateral sizes of around 100 nm and overlap each other, and are made up of nanosized multilayer graphene and graphitic carbon matrix (GCM). Long and straight SiC nanograins with hexagonal shapes, and with lateral sizes of around 200-400 nm are synthesized on the GGNs, which form compact SiC thin films.
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http://dx.doi.org/10.3390/ma6041543DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5452306PMC
April 2013

[Flavone and steroid chemical constituents from rhizome of Paris axialis].

Zhongguo Zhong Yao Za Zhi 2010 Nov;35(22):2994-8

School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China.

Objective: To study the chemical constituents from the rhizome of Paris axialis.

Method: The compounds were isolated by column chromatography with silica gel and purified by Sephadex LH-20 column chromatography and preparative RP-HPLC. The structures were identified by means of spectroscopic methods.

Result: Fourteen compounds were isolated from the EtOAc extract and the n-BuOH extract of P. axialis. Their structures were identified as daucosterol (1), stigmasterol-3-O-beta-D-glycopyranoside (2), beta-ecdysterone (3), pennogenin-3-O-alpha-L-arabinofuranosyl (1 --> 4) -[alpha-L -rhamnopyranosyl (1 --> 2)] -beta-D-glycopyranoside (4), diosgenin-3-O-alpha-L- rhamnopy-ranosyl (1 --> 4) -alpha-L-rhamnopyranosyl (1 --> 4) [alpha-L-rhamnopyranosyl (1 --> 2)] -beta-D-glycopyranoside (5), kaempferol (6), rutin (7), myrincitrin (8), 4, 2', 4'-trihydroxychalcone (9), isorhamnetin-3-O-beta-D- glycopyranoside (10), isorhamnetin-3-O-alpha-L-rhamnopyranosyl (1 --> 2) -beta-D-glycopyranoside (11), isorhamnetin-3-O-beta-D-glucpyranosyl (1 --> 6) -beta-D-glycopyranoside (12), kayaflavone (13), amentoflavone (14).

Conclusion: Compounds 1-3 and 6-14 are isolated from P. axialis for the first time; and compounds 7-10, 13, 14 are isolated from the genus Paris for the first time.
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November 2010

Qualitative and quantitative determination of major saponins in Paris and Trillium by HPLC-ELSD and HPLC-MS/MS.

J Chromatogr B Analyt Technol Biomed Life Sci 2010 Nov 1;878(29):2943-8. Epub 2010 Oct 1.

School of Pharmaceutical Science and Technology, Tianjin University, Weijin Road, Tianjin 300072, China.

High-performance liquid chromatographic (HPLC) with evaporative light scattering detection (ELSD) and HPLC with electrospray ionization multistage tandem mass spectrometry (HPLC-ESI-MS(n)) were used to identify and quantify steroid saponins in Paris and Trillium plants. The content of the known saponins such as Paris I, II, III, V, VI, VII, H, gracillin and protodioscin in Paris and Trillium plants was determined simultaneously using the developed HPLC-ELSD method. Furthermore, other 12 steroid saponins were identified by HPLC-ESI(+/-)-MS(n) detection. In the end, a developed analytical procedure was proved to be a reliable and rapid method for the quality control of Paris and Trillium plants. In addition, the alternative resources for Paris yunnanensis used as a traditional Chinese medicine were discovered according to the hierarchical clustering analysis of the saponin fraction of these plants.
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http://dx.doi.org/10.1016/j.jchromb.2010.08.033DOI Listing
November 2010

[Numerical taxonamy of Paris plants].

Zhongguo Zhong Yao Za Zhi 2010 Jun;35(12):1518-20

School of Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China.

Numerical taxonomic studies were carried out in order to elucidate the taxonomic relationship among 17 species belonging to Paris. Eighteen characters including 10 morphological, 4 pollen morphological, 2 cytotalonomical and 2 habitat characters were used for the analysis. On basis of UPGMA clustering analysis, two subgenus and seven groups were recognized. The classification of the two subgenus was different from the opinion of subgenus Daiswa and subgenus Paris by Li Heng. The classification of sect. Dunnianae, sect. Axiparis and sect. Paris was correspondence with the classification of Li Heng. But sect. Fargesianae, sect. Marmoratae and sect. Thibeticae which were established based on the especially characters by Li Heng were put into cluster 2, cluster 3 and cluster 4.
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http://dx.doi.org/10.4268/cjcmm20101202DOI Listing
June 2010