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Xiao D.,Kunming University of Science and Technology | Yang B.,Kunming University of Science and Technology | Chen Y.-J.,Kunming Pharmaceutical Group Corporation | Liao X.-L.,Kunming University of Science and Technology | And 3 more authors.
Asian Journal of Chemistry | Year: 2013

A sort of C-10-phenoxy artemisinin-chitosan conjugate, in which C-10-phenoxy artemisinin was covalently bound to chitosan, was prepared and its aqueous solubility was evaluated. The results indicated that the conjugate (1.013 mg/mL) had much higher aqueous solubility than artemisinin (0.0084 mg/mL) and C-10-phenoxy artemisinin (0.0245 mg/mL). The conjugate will be potentially useful for their application as the prodrug of artemisinin. Source


Yang X.,Kunming University of Science and Technology | Zhao Y.,Kunming University of Science and Technology | Chen Y.,Kunming Pharmaceutical Group Corporation | Liao X.,Kunming University of Science and Technology | And 5 more authors.
Materials Science and Engineering C | Year: 2013

The characterization, inclusion complexation behavior and binding ability of the inclusion complexes of mangiferin (MGF) with β-cyclodextrin and its derivatives (hydroxypropyl-β-cyclodextrin (HPβCD), sulfobutyl ether β-cyclodextrin (SBEβCD) and mono (6-ethylene-diamino-6-deoxy)-β- cyclodextrin (ENβCD)) were investigated in both solution and solid state by means of PL spectroscopy, 1H and 2D NMR, XRD, TG and DSC. The results showed that the water solubility and thermal stability of MGF were significantly increased in the inclusion complex with cyclodextrins. The MGF/CDs complexes will be potentially useful for the design of a novel formulation of mangiferin for herbal medicine. © 2013 Elsevier B.V. Source


Wang F.,Kunming University of Science and Technology | Yang B.,Kunming University of Science and Technology | Zhao Y.,Kunming University of Science and Technology | Liao X.,Kunming University of Science and Technology | And 6 more authors.
Journal of Biomaterials Science, Polymer Edition | Year: 2014

The inclusion complexation behavior of scutellarein (SCUE) with 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) has been investigated in both solution and in the solid state. SCUE/HP-β-CD solid system was prepared by suspension method. The formation of SCUE/HP-β-CD complex in aqueous solution was demonstrated by fluorescence spectroscopy, and the Job plot showed a maximum at a molar fraction of 0.5, indicating 1:1 inclusion complexation between SCUE and HP-β-CD. However, SCUE/HP-β-CD inclusion complex was characterized by means of XRD, DSC, 1H, and two-dimensional NMR. Through the complexation between HP-β-CD and SCUE, the water solubility and antitumor activity of SCUE were obviously increased. This satisfactory water solubility and high antitumor activity of the SCUE/HP-β-CD complex will be potentially useful for its application on human colon cancer chemotherapies. © 2014 Taylor & Francis. Source


Jiang R.-J.,Kunming University of Science and Technology | Zhao Y.-L.,Kunming University of Science and Technology | Chen Y.-J.,Kunming Pharmaceutical Group Corporation | Xiao D.,Kunming University of Science and Technology | And 7 more authors.
Carbohydrate Research | Year: 2014

A novel series of artesunate-β-cyclodextrin (ATS-β-CD) conjugates, in which artesunate (ATS) was coupled covalently to one of the primary hydroxyl groups of β-cyclodextrin (β-CD) through amino bond formation, were synthesized and characterized by 1H NMR, HRMS, 2D NMR (ROESY), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The results showed that the aqueous solubility of ATS-β-CD conjugates was 26-45 times better than that of free ATS. The cytotoxicity of the ATS-β-CD conjugates was evaluated on human colon cancer cell lines HCT116, LOVO, SW480, and HT-29, and the results indicated that ATS-2NβCD exhibited a very high cytotoxicity against HCT116, LOVO, and HT-29 with IC50 values of 0.58, 1.62, and 5.18 μmol/L, respectively. In addition, the supposition of better cytotoxicity was further supported by the control experiment of fluorescent cyclodextrin. © 2014 Elsevier Ltd. All rights reserved. Source


Xiao D.,Kunming University of Science and Technology | Yang B.,Kunming University of Science and Technology | Zhao Y.-L.,Kunming University of Science and Technology | Liao X.-L.,Kunming University of Science and Technology | And 4 more authors.
Journal of Inclusion Phenomena and Macrocyclic Chemistry | Year: 2014

The characterization, inclusion complexation behavior and binding ability of the inclusion complexes of dihydroartemisinin with β-cyclodextrin and its derivatives, sulfobutyl ether β-cyclodextrin (SBE-β-CD), mono[6-(2-aminoethylamino)-6-deoxy]-β-cyclodextrin (en-β-CD) and mono{6-[2-(2-aminoethylamino)ethylamino]-6-deoxy}-β-cyclodextrin (dien-β-CD), were studied using phenolphthalein as a spectral probe. Spectral titration was performed in aqueous buffer solution (pH ca. 10.5) at 25 °C to determine the binding constants. The inclusion complexation behaviors were investigated in both solution and solid state by means of NMR, TG, XRD. The results showed that the water solubility and thermal stability of dihydroartemisinin were significantly increased in the inclusion complex with cyclodextrins (CDs). According to 1H NMR and 2D NMR spectroscopy (ROESY), the A, B rings of dihydroartemisinin can be included into the cavity of CDs. The enhanced binding ability of CDs towards dihydroartemisinin was discussed from the viewpoint of the size/shape-fit concept and multiple recognition mechanism between host and guest. © 2013 Springer Science+Business Media Dordrecht. Source

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