Yikai Shi

Lanzhou University, Kao-lan-hsien, Gansu Sheng, China

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Publications (3)3.48 Total impact

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    ABSTRACT: To determine bergapten's concentration in plasma and observe its pharmacokinetics in rats using a combined LC-MS/MS analytical method. Blood samples were separated on a Hypersil ODS column (4.6 mm x 250 mm, 5 mm) at a temperature of 30 degrees C, and mobile phase consisted of water and methanol (22.5: 77.5) at a flow rate of 0.8 mL x min(-1). The methodological study showed a good linear relationship of 8.12-162.4 g x L(-1) (r = 0.9999). The inner and inter-days relative standard deviations were both less than 10% , indicating legitimate precise and accuracy to the requirement of biological sample analysis. The method is suitable for in vivo quantitative analysis for bergapten due to its accuracy, sensitivity and specificity. The pharmacokinetic process in rats forms a two-compartment model with first-order absorption.
    Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica 02/2012; 37(3):381-3.
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    ABSTRACT: A water-soluble sulfated glucan, SHG, was isolated from Hedysarum polybotrys Hand.-Mazz using anion-exchange and gel-permeation chromatography. Elemental analysis indicated that SHG was a sulfated polysaccharide containing small amount of sulfate groups (1.47 mass%). The molecular weight was estimated to be 1.72 × 105 Da by high-performance gel permeation chromatography (HPGPC) and size exclusion chromatography–multi angle laser light scattering (SEC–MALLS). SHG took random coil compact conformation in 0.1 M NaNO3. Compositional analysis revealed that SHG was composed of glucose only. On the base of partial acid hydrolysis, methylation analysis, gas chromatography–mass spectrometry (GC–MS), Fourier transform infrared (FT-IR) spectra, nuclear magnetic resonance (NMR) spectroscopy of 1H, 13C, β-correlation spectroscopy (β-COSY), total correlation spectroscopy (TOCSY), heteronuclear single quantum coherence (HSQC), and heteronuclear multiple bond correlation (HMBC), the results showed that SHG was composed of α-d-(1 → 4)-linked glucopyranosyl residues, with branches at C-6 consisting of non-reducing terminal approximately every eight residues. Sulfate groups may attach to the backbone at O-6, occasionally occurring per thirty-eight anhydrous glucose units.
    Carbohydrate Polymers 01/2012; 87(1):160–169. · 3.48 Impact Factor
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    ABSTRACT: To develop a HPLC method for determination of matrine, oxymatrine; ferulic acid, L-shikonin and beta, beta-dimethylacrylshikonin in compound preparatioti of Dangguishuan. The chromatogtaphic separation was performed on a Kromasil ODS C18 column (4.6 mm x 250 mm, 5 microm) maintaining at 30 degrees C during the whole process. The mobile phase consisted of methanol and 0.1% triethylamine aqueous solution (adjusted with phosphoric acid, pH 3) at a flow rate of 1.0 mL x min(-1). The detection wavelength was set at 220 nm for matririne and oxymatrine, 316 nm for ferulic acid, 516 nm for L-shikonin and beta, beta-dimethylacrylshikonin, respectively. All the compounds showed good linearity (r > 0.9996) in the range of the test concentrations, and the average recoveries of the method is betwuen 96.92% and 102.22%, RSD < 3.1%. The method is proved to be credible, sensitive, accurate and repeatable. It can be applied to determine of matrine, oxymatrine, ferulic acid, L-shikonin and beta, beta-dimethylacrylshikonin in compound preparation of Dangguishuan simultaneously, and provide a basal method of quality control to this preparation and other relative preparations.
    Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica 09/2010; 35(18):2402-5.