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Department of Food Science and Technology
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Department of Chemistry
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Department of Genetics
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    ABSTRACT: The properties of waxy rice flour (WRF) and non-waxy rice flour (RF) were modified using an extrusion process with different feeding material moisture contents. WRF was more affected by the thermomechanical stress from extrusion; consequently, it had a lower glass transition temperature but higher water solubility index (WSI) indicating higher molecular degradation than extruded RF. The lower moisture content of the feeding flour caused more severe flour damage (coarser surface of the extruded flour) and lowered relative crystallinity compared to higher moisture content processing. Moreover, low moisture content processing led to complete gelatinization, whereas, partial gelatinization occurred in the higher moisture content extrusion. Consequently, the extruded flours had a lower peak viscosity and gelatinization enthalpy but a higher water absorption index and WSI than native flour. In conclusion, the rice flour type and the moisture content of the extrusion feeding flour affected the physicochemical properties of the extruded flour.
    Carbohydrate Polymers 12/2014; 114:133–140. DOI:10.1016/j.carbpol.2014.07.074
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    ABSTRACT: This study explores deduced amino acid sequences of mimetic peptides of Vibrio cholerae O139 epitopes in order to design specific antigens for use in diagnostic method. Mimetic peptides expressed on E. coli flagella were selected from a FliTrx random peptide library via the interaction with purified monoclonal antibody to V. cholerae O139. Inserted nucleotides encoding bound peptides were determined by PCR. Peptides from clones giving positive results were confirmed by Western blot analysis. Sixty-two positive E. coli colonies were obtained and nucleotide-sequenced. Inserted nucleotides were translated into amino acids. Fifty-six patterns of deduced amino acid sequences were obtained without a consensus sequence. Most sequences of mimetic peptides have amino acid motif as RXXR with approximate molecular weight of 1,700 to 2,000. Arginine and glycine occupy the highest percentage of amino acid composition.
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    ABSTRACT: This research work presents the efficiency of the TiO2 and Ag-TiO2 thin films prepared by the sol-gel method and coated onto the surface of 304 stainless steel sheets used in the photocatalytic nitrate reduction processes. The Ag-TiO2 thin films had the weight by weight (w/w) ratio of Ag+/TiO2 of 0.1% as Ag atom. The XRD results showed that the crystalline phase structure of TiO2 on the Ag-TiO2 thin films was anatase. The optical band gaps of the TiO2 and 0.1%Ag-TiO2 thin films were respectively 3.27 and 2.70 eV, while the surface of the prepared catalysts was hydrophobic with the respective average water contact angles of 94.8 and 118.5 degrees for the TiO2 and 0.1%Ag-TiO2 thin films. The net efficiencies of photocatalytic nitrate reduction of TiO2 and 0.1%Ag-TiO2 were 41.4% and 70.0%, respectively. The loading of Ag only influenced the nitrate removal efficiency without affecting the stoichiometric ratio of formate to nitrate. The net stoichiometric ratio of formate to nitrate of all experiments was 2.8 to 1.0, which is close to the stoichiometric ratio of 2.5 to 1.0 of the nitrate reduction to nitrite and then to nitrogen gas.
    Journal of Saudi Chemical Society 09/2014; 18(4). DOI:10.1016/j.jscs.2014.02.001


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    Bangkok, Thailand
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Top publications last week by downloads

02/2010; DOI:10.5539/elt.v3n1p184
11/2010; DOI:10.4304/jltr.1.6.757-764

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