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Author: search.filters.author.Prachayawarakorn, JutaratSubject: search.filters.subject.Modification

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    Natural wound dressing films prepared from acetylated starch/κ-carrageenan blend incorporated with mandelic acid
    (2024-01-01)
    Sriphochai, Wimolsiri
    ;
    Prachayawarakorn, Jutarat
    Due to several limitations of acetylated starch film for wound dressing applications such as low mechanical properties and no antibacterial activity, acetylated starch film was, therefore, modified by different contents of κ-carrageenan and mandelic acid. Infrared spectra confirmed the presence of κ-carrageenan and mandelic acid in the modified acetylated starch films. In addition, the decreased crystallinity of the carrageenan modified acetylated starch films led to more smooth film, as observed by scanning electron images. Besides, the addition of various amounts of κ-carrageenan in the modified acetylated starch films caused the improvement of mechanical properties, moisture uptake, water vapor transmission rate (WVTR), and degree of swelling. Moreover, κ-carrageenan modified acetylated starch film loaded with 20 wt% of mandelic acid exhibited antibacterial property against both S.aureus and E.coli bacteria. Additionally, degree of crystallinity, mechanical properties, moisture uptake, WVTR, degree of swelling, antibacterial activity, and cytotoxicity of κ-carrageenan modified acetylated starch films added by different amounts of mandelic acid were also studied.
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    Chemical modification of biodegradable cassava starch films by natural mono-, di- and tri-carboxylic acids
    (2019-01-01)
    Prachayawarakorn, Jutarat
    ;
    Tamseekhram, Jintapa
    Starch is the most important polysaccharide polymer used to develop biodegradable films, mainly used for packaging applications. Due to high hydrophilicity and poor mechanical properties of biodegradable starch film, different types of natural carboxylic acids were introduced into cassava starch film. These were lactic acid (LA), malic acid (MA) or citric acid (CA), classified as the mono-, di- and tri-carboxylic acid, respectively. It was found from Infrared (IR) spectra that new IR peak position arisen from the ester group and new hydrogen bond formation were observed for different acid-modified starch films. In addition, the incorporation of different types of the acids into the cassava starch film also caused significant decrease of swelling, water uptake and water vapor permeability (WVP) because of more hydrophobicity of various starch films modified by the acids. Comparison among different types and contents of the acids used for modifying cassava starch films was performed. Furthermore, morphological, thermal and biodegradable properties were also investigated.
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    Dyeing properties of bombyx mori silks grafted with methyl methacrylate and methacrylamide
    (2006-04-15)
    Prachayawarakorn, Jutarat
    ;
    Kryratsamee, Watthana
    To improve their dyeing and colorfastness properties, degummed Bombyx mori silks were chemically modified by a grafting technique with either methyl methacrylate (MMA) monomer or methacrylamide (MAA) monomer. Both commercial synthetic dyes, that is, acid and basic dyes, and natural dyes extracted from turmeric, without and with potassium aluminum sulfate mordant, were used in this study. Percentage dye uptake increased with the presence of poly(methyl methacrylate) or polymethacrylamide in the silk fibroin structure regardless of the types of the dyestuffs. Furthermore, compared to the degummed silk, the colorfastness to washing of the MMA-grafted and MAA-grafted silks dyed with acid, basic, and curcumin dyestuffs were greatly improved. Colorfastness to both acid and basic perspirations with acid and basic dyestuffs was slightly improved, whereas perspiration fastness remained unchanged for curcumin dyeing without and with the presence of the mordant. Also, the low-light resistances of the degummed and grafted silks dyed by curcumin dyestuff were notably improved by the MMA and MAA grafting technique. © 2006 Wiley Periodicals, Inc.