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RISS 인기검색어
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- 저자 : Jingkun Wang (검색결과 4 건)
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Fabrication of coarse grain yttria composite and its corrosion resistance to molten titanium
Jingkun Yu,Chengwan Cui,Xinzhong Tian,Chun Wang,Xinli Wang,Wenbin Dai 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.10
To fabricate coarse yttria grain with closed pores for improving the thermal shock resistance of yttria, a proper additive wasfirstly selected among calcium nitrate, cerium nitrate, and neodymium nitrate. Then, the appropriate amount of calcia addedinto yttria was investigated. Finally, the corrosion resistance of the fabricated yttria crucible was compared with pure calcia,and magnesia crucible. The results reveled that by adding 1 mol% calcia, lots of closed pores were distributed in coarse yttriagrains and the composite has superior thermal shock resistance and excellent corrosion resistance with titanium alloy. Thenewly fabricated yttria might fit for the melting and casting of pure titanium and its alloys.
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Analysis of Fuzhisan and Quantitation of Baicalin and Ginsenoside Rb1 by HPLC-DAD-ELSD
Jingkun Zhao,Desheng Wang,Shurong Duan,Jianxiu Wang,Jing Bai,Wenlan Li 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.7
Fuzhisan (FZS) is a traditional Chinese medicine composed of Radix Ginseng Rubra (Araliaceae family), Scutellaria baicalensis Georgi (Labiatae family), Angelica sinensis (Oliv) Diels (Umbelliferae family), Anemone altaica Fisch. Ex C.A. Mey (Araceae family) and Glycyrrhiza uralensis (Leguminosae family). To establish the chemical fingerprint of the components of FZS and quantify the components, baicalin and ginsenoside Rb1, a high performance liquid chromatography method coupled with diode array and evaporative light scattering detectors (DAD-ELSD) was developed. Separation of 36 omponents from 12 batches of FZS was performed on a C18 column, with a mobile phase consisting of acetonitrile and 0.1% acetic acidwater, with gradient elution at a column temperature of 30℃. The optimum detection wavelength was set at 335 nm, the drift tube temperature of ELSD was set at 80℃, the carrier gas pressure was 25 psi, and the gain = 10. The similarity among 12 batches of FZS was over 0.95. Five constituents of FZS, namely baicalin, ferulic acid, and ginsenosides Rg1, Re, and Rb1, were identified based on their retention times (RT). Calibration curves for baicalin and ginsenoside Rb1 showed good linearity (r2 > 0.9992); recoveries ranged from 95% to 99%. This quantification method is reproducible and simple, and may provide a tool to assess the quality of FZS.
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Hongfei Zhu,Congcong Liu,Haijun Song,Jingkun Xu,Fangfang Kong,Jianmin Wang 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
Poly(3-hexylthiophene) (P3HT) films doped with iodine vapor have been prepared by casting a P3HT solution on glass substrates and their thermoelectric (TE) performances has been investigated. The maximum Seebeck coefficient and electrical conductivity of iodine-doped P3HT films were 386 μV·K−1 (at room temperature) and 4.7 × 10−1 S·cm−1, which is about five orders of magnitude higher than that of pristine P3HT films. The power factor of these iodine-doped P3HT films was estimated to be 7.0 μW·m−1·K−2 at room temperature, which is a relative high value for organic TE materials. The UV-vis spectra of iodine-doped P3HT films showed a slight red shift of the iodine-doped P3HT compared to those of pristine P3HT films. Atomic force microscopy images indicated the conformational changes in P3HT chains after treatment with iodine vapor. During this treatment, the P3HT chains self-organized into a more ordered structure, this organization improved the charge carrier transport capability and the TE performance of P3HT the films.
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New dammarane-type triterpenoid saponins from Panax notoginseng saponins
Qian Li,Mingrui Yuan,Xiaohui Li,Jinyu Li,Ming Xu,Di Wei,Desong Wu,Jinfu Wan,Shuangxi Mei,Tao Cui,Jingkun Wang,Zhaoyun Zhu 고려인삼학회 2020 Journal of Ginseng Research Vol.44 No.5
Background: Panax notoginseng saponin (PNS) is the extraction from the roots and rhizomes of Panax notoginseng (Burk.) F. H. Chen. PNS is the main bioactive component of Xuesaitong, Xueshuantong, and other Chinese patent medicines, which are all bestselling prescriptions in China to treat cardiocerebrovascular diseases. Notoginsenoside R₁ and ginsenoside Rg₁, Rd, Re, and Rb₁ are the principal effective constituents of PNS, but a systematic research on the rare saponin compositions has not been conducted. Objective: The objective of this study was to conduct a systematic chemical study on PNS and establish the HPLC fingerprint of PNS to provide scientific evidence in quality control. In addition, the cytotoxicity of the new compounds was tested. Methods: Pure saponins from PNS were isolated by means of many chromatographic methods, and their structures were determined by extensive analyses of NMR and HR-ESI-MS studies. The fingerprint was established by HPLC-UV method. The cytotoxicity of the compounds was tested by 3-(4,5-dimethylthiazol-2-yl)-2,5 -diphenyltetrazolium bromide assay. Results and Conclusion: Three new triterpenoid saponins (1e3) together with 25 known rare saponins (4 e28) were isolated from PNS, except for the five main compounds (notoginsenoside R₁ and ginsenoside Rg₁, Rd, Re, and Rb₁). In addition, the HPLC fingerprint of PNS was established, and the peaks of the isolated compounds were marked. The study of chemical constituents and fingerprint was useful for the quality control of PNS. The study on antitumor activities showed that new Compound 2 exhibited significant inhibitory activity against the tested cell lines.
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