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Author: search.filters.author.Ronte, Arnat

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    Advanced chitosan hybrid dye labels for dynamic monitoring of shrimp and milk freshness
    (2025-04-01)
    Ronte, Arnat
    ;
    Chalitangkoon, Jongjit
    ;
    Sintoppun, Tanaporn
    ;
    Niemhom, Nantawan
    ;
    Manapradit, Nuttaporn
    This study presents the development of intelligent screen-printed labels for real-time food freshness monitoring. Using chitosan grafted with rosolic acid (RA) and immobilized on montmorillonite (MMT) through cationic exchange, a hybrid dye was synthesized and applied in screen-printing inks. The hybrid structure was characterized by XRD, TGA, and UV–vis, confirming improved thermal stability and maintained halochromic properties. SEM analysis showed consistent ink deposition on filter paper, while water contact angle (WCA) measurements demonstrated enhanced surface hydrophobicity due to the MMT. The labels exhibited clear pH-sensitive color transitions from yellow to purplish red (pH 2.0–12.0) and rapid ammonia sensitivity, with ΔE values exceeding 45.0 within 10 min. The labels also demonstrated excellent reversibility, storage stability, leaching resistance, and cytocompatibility. Practical tests on shrimp and milk confirmed the labels' ability to accurately monitor freshness through visible color changes. These findings highlight the potential of hybrid labels as effective, scalable freshness indicators for intelligent food packaging.
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    Dual Cross-Linked Chitosan-Based Films with pH-Sensitive Coloration and Drug Release Kinetics for Smart Wound Dressings
    (2025-03-04)
    Chalitangkoon, Jongjit
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    Ronte, Arnat
    ;
    Sintoppun, Tanaporn
    ;
    Manapradit, Nuttaporn
    ;
    Monvisade, Pathavuth
    In this study, we developed dual-cross-linked hydrogel films based on carboxyethyl chitosan (CECS) and sodium alginate (SA), utilizing dialdehyde β-cyclodextrin (DA-βCD) and gluconic acid δ-lactone (GDL) as cross-linkers. Designed as smart wound dressings, the films exhibit pH sensitivity due to the incorporation of carboxyethylated phenol red-grafted chitosan (CS-PR-AA), which allows them to change color from orange to purple in response to pH variations. FT-IR and TGA analyses confirmed the formation of imine bonds and polyelectrolyte complexes, indicating successful cross-linking. The films demonstrated high cell viability, confirming their biocompatibility and nontoxicity. The swelling behavior varied with pH, underscoring their adaptability to different wound environments. Additionally, drug release kinetics were studied for films incorporating diclofenac sodium (DCF) at various pH levels, revealing that the release rate was influenced by cross-linking density and environmental pH. These findings suggest that the dual-cross-linked hydrogel films have significant potential as smart wound dressings, offering controlled drug release and pH-responsive behavior suitable for wound care applications.
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    Colorimetric Screen-Printed Label Using Low Molecular Weight Chitosan Grafted with Rosolic Acid for pH and Ammonia Gas Sensing
    (2024-10-15)
    Ronte, Arnat
    ;
    Chalitangkoon, Jongjit
    ;
    Monvisade, Pathavuth
    Colorimetric sensing technologies are valued for their simplicity and adaptability, yet their large-scale production remains economically challenging. This study presents a cost-effective colorimetric pH sensor developed from low molecular weight chitosan (LC) grafted with rosolic acid (LCRA), engineered as a pH-sensitive colorant for screen-printing inks. LCRA was synthesized via a Mannich reaction and characterized using<sup>1</sup> H NMR, FT-IR, and UV-Vis spectroscopy. LCRA showed reduced crystallinity and thermal stability alongside notable improvements in water solubility compared to its LC precursor. The LCRA ink displayed compatibility with various substrates, including polypropylene spun bond, filter paper, and cotton, applying easily via screen printing without any dye leaching. Notably, it exhibited a responsive color change from orange-yellow to pink-red in response to pH adjustments between 4.0 and 12.0 and upon exposure to ammonia gas. These findings position the LCRA label as a versatile and efficient solution for visual pH detection across various applications.
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    Development of a pH-responsive intelligent label using low molecular weight chitosan grafted with phenol red for food packaging applications
    (2024-05-01)
    Ronte, Arnat
    ;
    Chalitangkoon, Jongjit
    ;
    Foster, E. Johan
    ;
    Monvisade, Pathavuth
    In this study, we successfully developed a screen-printed pH-responsive intelligent label using low molecular weight chitosan grafted with phenol red (LCPR) as a colorant for screen printing ink. The LCPR was synthesized via a Mannich reaction, and its successful grafting was confirmed through FT-IR, UV–vis, and NMR spectroscopy. The LCPR exhibited lower crystallinity and thermal stability compared to low molecular weight chitosan (LC) and demonstrated zwitterionic behavior. To create intelligent labels, the LCPR-based ink was efficiently printed on cotton substrates with high resolution. The label exhibited remarkable sensitivity to buffer pH solutions and ammonia gas, leading to distinctive color changes from orange to red to purple. Additionally, the label showed excellent reversibility, storage stability, and leaching resistance to different food simulant solutions. The label was utilized to monitor shrimp freshness, successfully detecting a noticeable color shift upon spoilage. These findings highlight the significant potential of the LCPR-based label as an intelligent food packaging solution, offering pH-responsiveness and color stability for qualitative freshness detection of protein-rich food.
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    Carboxyethylation of chitosan-based polymeric dyes for potential pH-sensing applications
    (2023-08-01)
    Chalitangkoon, Jongjit
    ;
    Ronte, Arnat
    ;
    Monvisade, Pathavuth
    Background: Polymeric dyes have gained significant attention due to their unique properties and potential applications in various fields. Previous research has shown that chitosan-based polymeric dyes (CSPDs) had excellent color-sensing characteristics, but they had a solubility limitation. Methods: CSPDs were modified by the Michael reaction of acrylic acid in mild conditions. The synthesized derivatives were characterized using various analytical techniques, including FTIR, NMR, and UV–vis. Their crystallinity, thermal properties and solubility were also investigated. Significant findings: The presence of new carboxyethyl groups in novel water-soluble chitosan-based polymeric dyes (WCSPDs) after the modification was confirmed, without affecting their coloring. The derivatives also showed lower crystallinity, making them soluble in water over a wide range of pH values, and exhibited lower thermal stability. Furthermore, the derivatives displayed coloring properties and were nontoxic. These properties suggested the potential use of WCSPDs as sensor materials. In summary, the findings of this study highlighted the potential of WCSPDs as novel polymeric dyes with unique properties that could have significant applications in diverse fields, such as sensing and biomedical engineering.