Extraction of chondroitin sulfate from chicken keel cartilage by combined applicationof ultrasound treatment and alcalase hydrolysis - Truong Ngoc ThaoBy the combined application of ultrasound treatment and enzymatic hydrolysis with Alcalase, chondroitin sulfate (CS) was extracted from chicken keel cartilage with high yields. At the optimal conditions found for the ultrasound treatment by using Circumscribed Central Composite design and Modde 5.0 software, the yield of CS was 24.29 % of the ab...
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Synthesis of phenothiazine derivatives as novel moieties toward utilization in alternative donor – acceptor conjugated polymers - Truong Tung KhuongTwo new phenothiazine derivatives, PDA and PyP, have been successfully synthesized via Buchwald-Hartwig C-N coupling amination with the present of catalytic palladium. The chemical structures of these products were analyzed by 1H NMR spectra while light absorption properties were characterized via UV – Vis spectroscopy in a series of different c...
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Cholestane-Type steroids from the octocoral verrucella corona - Ninh Thi NgocThree cholestane-type steroids, (22E)-cholesta-5,22-dien-3β-ol-7-one (1), trans-liagosterol (2), and guggulsterol-II (3), were isolated and structurally elucidated from methanol extract of the Vietnamese octocoral Verrucella corona. Among them, compound 2 showed significant cytotoxicity against eight human cancer cell lines as HepG2, HL-60, KB, ...
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The protective effect of some extracts and isolated compounds from euphorbia hirta on pancreatic β-Cells min6 - 1, 2, Le Tien Dung3, *, Nguyen Trong Tuan1, Nguyen Quoc Chau ThanhThe cell-protective effects of crude ethanol extract and some fractioned extracts as well as some isolated compounds from Euphorbia hirta L. collected in the Mekong Delta on ER stressinduced cell death in mouse β-cell lines were investigated. The results of this study revealed that methanol extract and quercitrin isolated from Euphorbia hirta L. ...
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Chemical constituents of the ethyl acetate fraction of the fruit bodies of phellinus gilvus - Do Xuan HungThe 1H NMR spectrum of compound 4 has signals for the trans-double bond with big coupling constant (H-2, H-3, J = 16.5 Hz) and three aromatic protons, together with one methyl group. The methyl group has HMBC correlation with C-1 (199.1 ppm), indicating the presence of CH3CO- partital structure. This moiety is connected with the double bond C2-3...
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Nickel-Based multiwalled carbon nanotube composite coatings - Bui Hung ThangThe SEM and EDS results confirmed the presence of CNTs in the Ni-CNTs electrodeposition coating. The fine and uniform grain size as well as the presence of CNTs in the electrodeposition coating improved the mechanical properties of the Ni-CNTs coating compared to the Ni coating. The measurement results showed that the hardness and adhesion of th...
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Effect of polycaprolactone on characteristics and morphology of alginate/chitosan/lovastatin composite films - Nguyen Thuy ChinhThe alginate/chitosan/polycaprolactone/lovastatin (AG/CS/PCL/LS) composite films were prepared by solution method. The presence of PCL as a compatibilizer contributes to enhance the compatibility, interaction and dispersion of CS, AG and LS in the composite films, therefore, LS rods are more uniformly dispersed in the AG/CS//LS composite films, ...
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Aging of waterborne paint based on acrylic resin emulsion and organic pigment - Dao Phi HungThe aim of this study was to compare the stability of different waterborne paints based on the acrylic emulsion, TiO2, additives and either in absence of Luconyl or in presence of Luconyl. After 800-hour aging, both of the paint systems showed that there was no significant change in general appearance. The adhesion was stable after aging. Howeve...
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Formation of secondary non-Sulfide zinc ore in Cho Dien Pb - Zn deposits - Nguyen Thi LienIn the Cho Dien deposit, strong weathering process makes the upper part of ore bodies completely oxidized. Primary ore minerals are mainly sphalerite, pyrite, galena which are replaced by secondary ore minerals such as hemimorphite (calamine), smithsonite, goethite, anglesite and cerusite. Difference in geochemical behavior of lead (Pb) and z...
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The triterpenoid and steroid from the fruiting body of ganoderma applanatum (pers.) pat. in Viet Nam - Hoang Van TrungCompound 5 was obtained as white powder. The EI-MS of 5 showed a pseudomolecular ion peak at m/z 454 [M]+, combination with 1H- and 13C-NMR spectral data allowed to propose the molecular formula of C30H46O3. In its 1H-NMR spectrum, there were proton signals characteristic of three olefinic protons [ H 5.47 (1H, d, H-7); 6.91 (1H, t, H-24) and 5....
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