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Author: search.filters.author.Techavuthiporn, ChairatSubject: search.filters.subject.bioactive compounds

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    Efficacy of Sweet Basil Oil-chitosomes in Disease Suppression and Antioxidant (Enzymatic and Non-enzymatic) Responses in ‘Nam Dok Mai No. 4’ Mangoes during Shelf Life
    (2026-01-01)
    Techavuthiporn, Chairat
    ;
    Suo, Xiaoyu
    ;
    Wannasawad, Kittikoon
    ;
    Thaisamak, Phirunrat
    ;
    Supapvanich, Suriyan
    This study investigated the effects of chitosomes, sweet basil oil, and sweet basil oil-chitosomes on oxidative stress and disease resistance in ‘Nam Dok Mai No. 4’ mangoes stored at room temperature (27 ± 2°C) for 8 days. Untreated fruits developed disease rapidly, with incidence reaching 100% by day 6, while all treatments delayed symptom development. Notably, sweet basil oil-chitosomes completely suppressed disease throughout storage. Hydrogen peroxide (H<inf>2</inf>O<inf>2</inf>) levels increased sharply in control and chitosome-treated fruits, while sweet basil oil and its encapsulated form significantly reduced H<inf>2</inf>O<inf>2</inf> accumulation, with the encapsulated treatment maintaining the lowest levels in both peel and pulp. Both treatments slowed a decline in total phenolic content and ascorbic acid, with sweet basil oil-chitosomes offering the most effective preservation. Antioxidant enzyme activities (catalase and ascorbate peroxidase) were lowest in controls, moderately increased by chitosomes, and strongly enhanced by sweet basil oil. The encapsulated treatment showed the highest enzyme activities, with 4.02- and 8.02-fold increases in peel, and 10.8- and 4.96-fold increases in pulp. Pearson’s correlation indicated that sweet basil oil-chitosomes most effectively stabilized the antioxidant network and minimized oxidative stress, followed by chitosomes and free basil oil, while the control exhibited the weakest defense, consistent with its higher anthracnose susceptibility. Principal component analysis further confirmed that sweet basil oil-chitosomes offered the greatest protection by sustaining both enzymatic and non-enzymatic antioxidants. These results demonstrate that sweet basil oil-chitosomes, as an innovative nanocarrier delivery system, offer a promising natural strategy for enhanced postharvest disease management and quality preservation in mangoes.
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    Postharvest UV-C Treatment Affects Bioactive Compounds and Maintains Quality of Okra (Abelmoschus esculentus L.) during Storage
    (2024-01-01)
    Techavuthiporn, Chairat
    ;
    Jarerat, Amnat
    ;
    Singhkai, Chonlada
    ;
    Nimitkeatkai, Hataitip
    The effects of UV-C treatment on physicochemical quality, bioactive compounds and antioxidant activity of okra (Abelmoschus esculentus L.) during storage were investigated. Okra pods were exposed to UV-C irradiation dose at 1.5, 3.0 or 6.0 kJ·m<sup>−2</sup> before storage at 10 ± 2°C for 12 days. The results showed that UV-C treatment had a significant effect on okra bioactive compounds, such as ascorbic acid, total phenolic, flavonoid contents and antioxidant activity. The highest values of these compounds were observed in okra treated with 6.0 kJ·m<sup>−2</sup> UV-C irradiation. A statistical analysis of the data demonstrated that mucilage had a favorable association with antioxidant capabilities and bioactive substances in response to UV-C treatment. Moreover, UV-C treatment also effectively maintained the quality of okra during storage, as evidenced by lower weight loss and higher firmness without incidence of decay. Therefore, postharvest UV-C treatment can be a potential approach to enhance bioactive compounds and maintain the quality of okra during storage.