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    Phytochemical analysis of Melaleuca cajuputi Powell leaves for the development of herbal tea
    (2026-06-01)
    Montri, N.
    ;
    Chalornsiri, S.
    ;
    Pato, N.
    ;
    Kueasakun, N.
    ;
    Deewatthanawong, R.
    The plant Melaleuca cajuputi Powell, commonly known as cajuput, is found in coastal swamp forests in Thailand. Traditional knowledge suggests using cajuput tea, derived from its leaves, for treating peptic ulcers. The research was conducted to evaluate the chemical composition of the dried leaves from different stages of leaf age and drying methods. The young, immature, and mature leaves were picked from the tree. Leaves were cleaned and dried in a hot air oven at 40, 45, and 50°C. The tea extracts were then analyzed for acid concentration and phenolic content. The study revealed that drying young leaves using varying acid concentrations significantly affected leaf age; however, the drying methods did not exhibit a notable effect. The highest levels of citric acid, malic acid, and tartaric acid were observed in young leaves. Hot air oven at 40°C resulted in the highest total phenolic content at 137.55mg GAE g<sup>-1</sup> DW.
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    Application of Melaleuca cajuputi Powell crude extract on controlling postharvest anthracnose disease in Gross Michel banana (Musa (AAA group) ‘Kluai Hom Thong’)
    (2026-03-01)
    Montri, N.
    ;
    Leujantuak, P.
    ;
    Tongsri, V.
    ;
    Deewatthanawong, R.
    ;
    Bunya-Atichart, K.
    Exporting Gross Michel bananas, known as ‘Kluai Hom Thong’ in Thailand, to Japan involves several considerations to ensure compliance with Japan’s stringent food safety and quality standards, especially regarding pesticide residues and other contaminants. The research aimed to evaluate the impact of various concentrations of Melaleuca cajuputi Powell crude extract on controlling postharvest anthracnose disease in Gross Michel bananas, focusing on developing a non-toxic production method. The 70% ripening stage bananas were dipped with 0, 800, 1,000, and 1,200 mg L<sup>-1</sup> crude extract for 2 min before spraying with 10<sup>-6</sup> spore mL<sup>-1</sup> of Colletotrichum musae spore suspension, followed by a 2-day incubation, subsequent spraying with 500 mg L<sup>-1</sup> of ethephon solution, and a further 1-day incubation at ambient temperature (29±2°C). The shelf-life of banana, weight loss, total soluble solids, and surface morphology of banana peel were analyzed. Results showed that applying M. cajuputi Powell crude extract could extend shelf-life and maintain the quality of banana fruits. The 800 mg L<sup>-1</sup> crude extract resulted in 2.13% weight loss, with peel density at 14.80 N cm<sup>-3</sup> and pulp density at 6.23 N cm<sup>-3</sup>. Additionally, it resulted in the lowest percentage of anthracnose disease at 7.5% and the longest shelf life of 8 days.