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Author: search.filters.author.Assawaseangrat, Pornsawan

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    Preparation of Vegetable Waste-Derived Paper Incorporated with Activated Carbon for Delay Mango Ripening and its Application
    (2026-01-01)
    Sriprom, Pongsert
    ;
    Thongkham, Phaewa
    ;
    Taweesukyingjaroen, Jurairat
    ;
    Somphan, Apiruk
    ;
    Manamoongmongkol, Kanjana
    In this study, the vegetable waste-derived paper was developed from vegetable waste-derived fiber and Mahachanok mango seed-derived activated carbon to extend the shelf life of Golden Nam Dok Mai mangoes. Vegetable waste was subjected to alkaline processing using sodium hydroxide to extract plant-based fibers, which were then formed into paper sheets. Activated carbon, derived from Mahachanok mango seeds by carbonization at 450°C and activated by potassium permanganate (KMnO4), was incorporated into the vegetable waste-derived paper to enhance ethylene adsorption efficiency. Three formulations of ripening delay paper were prepared: paper without activated carbon, paper containing 10 g of activated carbon, and paper containing 20 g of activated carbon. The physical properties of the papers were evaluated in terms of tensile strength and water drop absorption. The vegetable waste-derived paper incorporated with 20 g activated carbon showed the highest performance among the developed papers (1.20 ± 0.24 MPa and 0.74 seconds, respectively). Application tests on Golden Nam Dok Mai mangoes showed that the 10 g activated carbon formulation was the most effective in preserving flesh color, maintaining firmness, and balancing total soluble solids (TSS) and titratable acidity (TA), indicating a delayed ripening process. Therefore, ripening delay paper synthesized from vegetable fiber and supplemented with 10 g of activated carbon per 1 kg of fruit was proven to effectively prolong mango shelf life by up to 3 days, demonstrating its potential as a biodegradable solution for postharvest quality preservation.
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    Cleaner Bio-Based Plasticizer Synthesis from Waste Cooking Oil to Substitute Toxic Dioctyl Phthalate in PVC film
    (2025-01-01)
    Chaiyaraksa, Chompoonut
    ;
    Sriprom, Pongsert
    ;
    Boonkaen, Fahana
    ;
    Laemsri, Arthittaya
    ;
    Smingkaew, Arnita
    This research aimed to investigate the possibility of synthesizing a bio-based plasticizer from waste cooking oil using an epoxidation reaction to replace dioctyl phthalate (DOP) in PVC film, which is toxic and hazardous to human health and the environment. This involved synthesizing used household oil through an epoxidation reaction to introduce epoxy groups, followed by isopropyl alcohol to break the epoxy rings and form hydroxyl groups. The chemical structure of the epoxidized waste cooking oil plasticizer was analyzed using Fourier transform infrared spectroscopy (FT-IR), with a focus on confirming the presence of epoxy groups within the 3,500 – 3,000 cm-1 range. Subsequently, this bio-based plasticizer was used in various ratios to DOP to produce PVC films, including ratios of 5:0, 4:1, 3:2, 2:3, 1:4, and 0:5. These PVC films were subject to a comprehensive examination of their physical and chemical properties, including their resistance to tensile stress, elongation ability, the impact on molecular functional groups in the PVC film, and a leaching test. The results showed that the optimal proportion of epoxidized waste cooking oil plasticizer to DOP was 5:0. This ratio demonstrated superior tensile strength, enhanced elongation capacity, increased thermal stability, and exhibited the most robust resistance against solvents compared to other ratios tested.