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Porous antimicrobial crosslinked film of hydroxypropyl methylcellulose/carboxymethyl starch incorporating gallic acid for wound dressing application
(2024-01-01)
Pitpisutkul, Vipawan
;
Prachayawarakorn, Jutarat
Because of weak mechanical qualities and low degree of swelling of hydroxypropyl methylcellulose/carboxymethyl starch (HP/CMS) blended films for wound dressing application, this work prepared a unique antimicrobial crosslinked film utilizing succinic acid (SA) as a non-toxic crosslinker and gallic acid (GAL) as an antibacterial agent. It was observed that the infrared-shifted peak position of O[sbnd]H stretching and bending in HP/CMS/SA/GAL films was caused by hydrogen bond formation among HP, CMS and GAL components. The antimicrobial crosslinked films considerably enhanced their mechanical properties and swelling degree. After adding SA and GAL, the films retained their porosity structure as observed by scanning electron images. Moreover, GAL-loaded HP/CMS/SA films could inhibit Staphylococcus aureus and Escherichia coli growth, showing their wound dressing potential. Crystallinity percentage, water vapor transmission rate, gel fraction, water solubility, water uptake and cytotoxicity were also investigated.
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Hydroxypropyl methylcellulose/carboxymethyl starch/zinc oxide porous nanocomposite films for wound dressing application
(2022-12-15)
Pitpisutkul, Vipawan
;
Prachayawarakorn, Jutarat
Because of low moisture uptake, water vapor transmission rate, oxygen transmission rate, swelling capacity and no antibacterial activity of hydroxypropyl methylcellulose (HPMC) film, carboxymethyl starch (CMS) and zinc oxide nanoparticles (ZnO-NPs) were incorporated in order to improve its limitations for wound dressing application. The infrared shifted peak of O–H stretching and O–H bending in HPMC/CMS blended films was detected due to hydrogen bond formation between HPMC and CMS. Scanning electron images of HPMC/CMS blended films exhibited porous structure. In addition, swelling degree, moisture uptake, water vapor transmission rate and oxygen transmission rate of HPMC/CMS blended films with various contents of CMS clearly increased compared to HPMC film. Moreover, HPMC/CMS nanocomposite films loaded with ZnO-NPs showed good antibacterial activity against Staphylococcus aureus and Escherichia coli, revealing their potential for wound dressing application. Percentage of crystallinity, cytotoxicity, mechanical and thermal properties were also examined.
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Property improvement of biodegradable citric acid-crosslinked rice starch films by calcium oxide
(2021-12-15)
Sornsumdaeng, Kittichai
;
Seeharaj, Panpailin
;
Prachayawarakorn, Jutarat
Due to several important limitations for packaging applications of starch film such as strength and hydrophilicity, rice starch (Oryza sativa) film was crosslinked with citric acid and modified by different contents of calcium oxide. FTIR spectra showed the evidence of crosslinking by citric acid and the presence of calcium oxide in the modified rice starch films. After the crosslinking, the decrease of degree of crystallinity and swelling including the increase of film smoothness and strain at maximum load were observed. The application of both citric acid and calcium oxide caused greater decrease of swelling, moisture uptake as well as higher stiffness and antibacterial activity than those of the use of only the citric acid. The highest stiffness and antibacterial activity were found for the crosslinked film added by 5 wt% calcium oxide. Moreover, the effect of calcium oxide contents on morphological, thermal and biodegradable properties of the crosslinked films was also investigated.
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Property Improvement of Biodegradable High-Methoxy Pectin Film by Different Contents of Dialdehyde Starch
(2020-08-01)
Prachayawarakorn, Jutarat
;
Poomkaew, Sasikorn
In order to improve high hydrophilicity and low mechanical properties of biodegradable high-methoxy pectin (HMP) film, dialdehyde starch (DS) were introduced. In this study, different HMP/DS blended films were prepared by varying DS contents. It was observed from Infrared spectra that lower peak intensity of C=O stretching was detected after the incorporation of DS into HPM film. Moreover, moisture uptake of various HMP/DS blended films was found to be significantly lower than those of HMP film with the addition of low DS content. The improvement of mechanical properties was observed in various HPM/DS blended films. In addition, color parameters, swelling power, morphological and biodegradable properties of various HMP/DS blended films were also investigated.
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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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