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Subject: Chemistry

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Now showing 1 - 10 of 180
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    Nondestructive rheological measurement of aqueous dispersions of solid lipid nanoparticles: Effects of lipid types and concentrations on dispersion consistency
    (2010-09-01) Nispa Seetapan; Piyawan Bejrapha; Wanwisa Srinuanchai; Satit Puttipipatkhachorn; Uracha Ruktanonchai; Thailand National Metal and Materials Technology Center; Thailand National Science and Technology Development Agency; Mahidol University
    Purpose: To investigate dispersion consistency of solid lipid nanoparticles as functions of lipid types and concentrations. Methods: Viscoelastic measurement at an application of low stress was employed to characterize the internal microstructure... developed within the dispersions. Pure triglycerides with different length of fatty acid chains, trimyristin (C14), tripalmitin (C16), and tristearin (C18) were studied with respect to the partial triglyceride with C22 chain length (Compritol 888 ATO
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    MEASUREMENT OF INFRARED ROTATORY DISPERSION OF INDUCED CHOLESTERIC PHASES BY COMPUTERIZED DISPERSIVE INFRARED SPECTROPHOTOMETERS.
    (1986-01-01) S. Bualek; P. Chingduang; P. Bunsawansong; O. Phaovibul; E. H. Korte; B. Schrader; Mahidol University
    This work reports the measurement of IR-ORD spectrum using an optical arrangement similar to that described by H. H. Belz et al. , but employing the dispersive infrared spectrophotometer Perkin Elmer Model PE683 equipped with the Data Station Model
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    Enhanced dissolution of ursodeoxycholic acid from the solid dispersion
    (1997-01-01) Siriporn Okonogi; Etsuo Yonemochi; Toshio Oguchi; Satit Puttipipatkhachorn; Keiji Yamamoto; Chiang Mai University; Chiba University; Mahidol University
    Solid dispersions of a very slightly water-soluble drug, ursodeoxycholic acid (UDCA), were prepared using urea, mannitol, and PEG 6000 as a carrier, and the solubility of UDCA was determined in water-ethanol (I:I) mixed solvent as a function of UDCA...-carrier ratio. The solubility of UDCA was slightly improved when urea or PEG 6000 was used as a carrier. The powder x-ray diffraction measurements revealed that UDCA did not exist in the crystalline state in the solid dispersions. Differential scanning
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    Stabilizing ability of surfactant on physicochemical properties of drug nanoparticles generated from solid dispersions
    (2017-07-03) Thanu Thongnopkoon; Satit Puttipipatkhachorn; Mahidol University
    © 2017 Informa UK Limited, trading as Taylor & Francis Group. This study was aimed to examine the nanoparticle formation from redispersion of binary and ternary solid dispersions. Binary systems are composed of various ratios of glibenclamide (GBM...) and polyvinylpyrrolidone K30 (PVP-K30), whereas a constant amount at 2.5%w/w of a surfactant, sodium lauryl sulfate (SLS) or Gelucire44/14 (GLC), was added to create ternary systems. GBM nanoparticles were collected after the systems were dispersed in water for 15 min
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    Relationships among blending conditions, size of dispersed phase, and oil resistance in natural rubber and nitrile rubber blends
    (2001-10-31) Chakrit Sirisinha; Sauvarop Baulek-Limcharoen; Jarunee Thunyarittikorn; Mahidol University; The Institute of Science and Technology for Research and Development, Mahidol University
    strongly on the blending time than the rotor speed. The size of the NR dispersed phase is approximately independent of the rotor speed, but it decreases with increasing blending time up to 25 min. With a further increase in the blending time the NR... dispersed phase size decreases. The results for the relative tensile strength, which is an indicator of oil resistance, are in agreement with those of the blend morphology, indicating that the oil resistance in a 20/80 NR/NBR blend strongly depends
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    Toward one-pot lipase-catalyzed synthesis of poly(e-caprolactone) particles in aqueous dispersion
    (2014-01-01) Pranee Inprakhon; Pabhangkon Panlawan; Thunyarat Pongtharankul; Emmanuelle Marie; Lars O. Wiemann; Alain Durand; Volker Sieber; Mahidol University; Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB; CNRS Centre National de la Recherche Scientifique; Université de Lorraine
    The preparation of polyester particles using enzyme-catalyzed (lipase from Candida antarctica B, CALB) ring-opening polymerization of e-caprolactone (e-CL) in aqueous dispersion was demonstrated for the first time. Immobilization of CALB enabled a... controlling ring-opening polymerization of e-CL in aqueous dispersion. In addition, the involvement of solubilized monomers in polymerization elementary reactions was demonstrated and the consequences on oligomers average length were detailed. An overall
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    Catalysis on water: Hydrogenation of ketones and aldehydes by platinum nanoparticles dispersed in amphiphilic hyperbranched polystyrene, Pt@HPS-NR3+Cl-
    (2014-01-01) Arada Chaiyanurakkul; Lei Gao; Takashi Nishikata; Keisuke Kojima; Hideo Nagashima; Kyushu University; Mahidol University; Nissan Chemical Industries, Ltd; Japan Science and Technology Agency
    © 2014 The Chemical Society of Japan. Platinum nanoparticles dispersed in the ammonium salts of hyperbranched polystyrene, Pt@HPS-NR3Cl, catalyzed the hydrogenation of ketones and aldehydes when water was used as the solvent without any coexisting... organic solvents. The significant increase in the reaction rate was observed when an organodispersible Pt@HPS-N+(C8H17)3Cl-(1a) was used as the catalyst, whereas catalyst recycling was achieved with water-dispersible Pt@HPS-N+(C4H9)3Cl-(1b).
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    Optimization of highly dispersible silica/carbon black hybrid filler ratio for tire tread based on solution- and emulsion-styrene butadiene rubber
    (2022-08-05) Thaptong P.; Sae-Oui P.; Jittham P.; Sirisinha C.; Mahidol University
    (S-SBR) and emulsion-SBR (E-SBR) were selected and reinforced by various ratios of highly dispersible silica (HDSi) to carbon black (CB). Although increasing the CB ratio had negative effects on WG, FSE, heat build-up, and dynamic set, it improved... transition temperature (Tg) and the greater magnitudes of rubber-filler interaction and crosslink density of S-SBR. Surprisingly, the HDSi/CB hybrid ratio and the SBR type had little influence on the degree of filler dispersion, probably because
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    New metastable form of glibenclamide prepared by redispersion from ternary solid dispersions containing polyvinylpyrrolidone-K30 and sodium lauryl sulfate
    (2016-01-01) Thanu Thongnopkoon; Satit Puttipipatkhachorn; Mahidol University
    , were obtained from redispersion of ternary solid dispersion systems. The ternary solid dispersion systems, consisting of GBM, polyvinylpyrrolidone- K30 (PVP-K30) and sodium lauryl sulfate (SLS), were prepared by solvent evaporation method
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    Green hairy basil seed mucilage biosorbent for dispersive solid phase extraction enrichment of tetracyclines in bovine milk samples followed by HPLC analysis
    (2024-05-01) Nakhonchai N.; Prompila N.; Ponhong K.; Siriangkhawut W.; Vichapong J.; Supharoek S.a.; Nakhonchai N.; Mahidol University
    Unmodified hairy basil seed mucilage (Ocimum basilicum L.), with attractive features as structural functionality and adsorption capacity, was employed as a green biosorbent for dispersive solid phase extraction and enrichment of oxytetracycline..., tetracycline, and doxycycline before quantitation by HPLC-UV for the first time. Hairy basil crushed seed increased the contacting surface area and was completely dispersed in the sample solution to extract tetracyclines under acidic condition