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Author: search.filters.author.Permana, LasuardiSubject: search.filters.subject.Chitosan

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    Study on chemical structure stability and properties of chitosan-incorporated tamarind seed kernel xyloglucan hydrogels
    (2024-12-05)
    Manamoongmongkol, Kanjana
    ;
    Sriprom, Pongsert
    ;
    Narkrugsa, Woatthichai
    ;
    Phumjan, Lamphung
    ;
    Permana, Lasuardi
    This study investigated the stability of chitosan-incorporated tamarind seed kernel xyloglucan hydrogels prepared at different ratios after storage for three years. The physical hydrogel samples were studied using ratios of xyloglucan to chitosan between 1.5:1 and 4:1, comparing fresh hydrogel with hydrogel stored for three years. The hydrogels were analyzed for Fourier transform infrared characteristics, rheological behavior, flow rate, and zeta potential. After three years of storage, a reversible reaction was confirmed by C-H molecular stretching using Fourier transform infrared. All hydrogel samples exhibited pseudoplastic fluid characteristics with liquid-like behavior. The zeta potential of fresh hydrogel at 1.5:1 and 4:1 ratios was 27.700 ± 0.964 mV and 22.633 ± 0.929 mV, respectively, whereas after three years, it became 28.067 ± 1.106 mV and 18.867 ± 0.503 mV, respectively. The amount of xyloglucan significantly affected the zeta potential of the xyloglucan-chitosan hydrogel, leading to a decrease in the stability of the hydrogel at a 4:1 ratio. The stability of the hydrogel at a ratio of 1.5:1 was confirmed by pH and zeta potential measurements. In conclusion, the properties and behavior of the xyloglucan-chitosan hydrogel remained stable after three years of storage at a 1.5:1 ratio.
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    Preparation, characterization, and antimicrobial activity of xyloglucan-chitosan film from tamarind (tamarind indica L.) seed kernel
    (2023-06-01)
    Adair, Pornpatu
    ;
    Sriprom, Pongsert
    ;
    Narkrugsa, Woatthichai
    ;
    Phumjan, Lamphung
    ;
    Manamoongmongkol, Kanjana
    Xyloglucan from tamarind seed kernel powder and chitosan were prepared using acetic acid as an oxidizing agent to form a xyloglucan-chitosan film. This study evaluated the properties of xyloglucan-chitosan films with different loading ratios of xyloglucan using various analytical tools. The covalent bonds formed by the oxidized xyloglucan and chitosan were confirmed by FTIR analysis. Morphological analysis using SEM indicated the formation of a conventional covalent bond in the xyloglucan-chitosan film. The water vapor transmission rate in the xyloglucan-chitosan film was reduced significantly with increasing xyloglucan ratio. Conversely, the increase in the xyloglucan ratio improved the film's mechanical properties (tensile strength = 1.84 ± 0.06<sup>a</sup> MPa, elongation at break = 22.47 ± 0.65<sup>a</sup> %). Furthermore, due to the antimicrobial activity of chitosan, the xyloglucan-chitosan film exhibits intense antimicrobial activity. Therefore, the xyloglucan-chitosan film demonstrated good properties for biodegradable food packaging.
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    Production of antimicrobial film-reinforced purified cellulose derived from bamboo shoot shell
    (2023-06-01)
    Manamoongmongkol, Kanjana
    ;
    Sriprom, Pongsert
    ;
    Phumjan, Lamphung
    ;
    Permana, Lasuardi
    ;
    Assawasaengrat, Pornsawan
    In this paper aimed to enhance the mechanical properties of an antimicrobial film by incorporating purified cellulose obtained from bamboo shoot shells into a chitosan matrix. Films with varying amounts of cellulose (0%w/v, 0.2%w/v, and 0.4%w/v) were investigated. Results indicated that the chitosan film reinforced 0.4%w/v cellulose exhibited higher tensile strength (43.50 MPa) and elongation at break (39.40 %) compared to the film without cellulose (34.47 MPa, 18.27 %). Additionally, the film with 0.4%w/v cellulose showed antimicrobial activity against B. cereus (MIC 12.5 mg/mL), S. aureus (MIC 6.25 mg/mL), E. coli (MIC 6.25 mg/mL), and exhibited 68.67 % inhibition of Fusarium oxysporum. Due to its biodegradability, favorable mechanical properties, and strong antimicrobial ability, the cellulose-chitosan film presents a promising alternative to be applied in the food industry, such as in packaging of dried food or as a coating film.