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Author: search.filters.author.Poeaim, S.Subject: search.filters.subject.Teak

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    Item type:Publication,
    Influence of leaf type, genotype, and location on bioactivities and assessment of genetic diversity in teak (Tectona grandis L. f.)
    (2026-03-01)
    Poeaim, S.
    ;
    Phonmakham, J.
    Marked variation in biological activities was observed among teak (Tectona grandis L. f.) leaf extracts as influenced by leaf type, tree genotype, and planting location. Fresh leaves generally exhibited stronger antibacterial activity than fallen leaves, with significant differences detected among plus trees originating from Chiang Mai, Phrae, Sukhothai, Lampang, and Khon Kaen and grown at the Thongphaphum and Phitsanulok Silviculture Research Stations. Among all samples, the Phrae plus tree cultivated at Thongphaphum showed the highest antibacterial inhibition against the tested microorganisms. Methanol extracts demonstrated antibacterial, anti-tyrosinase, and anti-inflammatory activities, while sequential extraction of Phrae plus tree leaves using hexane and dichloromethane yielded fractions with potent antibacterial effects, indicating promising potential for the development of new antibacterial agents. Genetic analysis based on sequence-related amplified polymorphism (SRAP) markers revealed similarity coefficients ranging from 0.67 to 1.00, reflecting low to moderate genetic diversity among the studied germplasm, with some samples exhibiting nearly identical genetic profiles. Overall, the observed variation in biological activities was closely associated with both genetic background and environmental conditions, providing valuable information for teak germplasm selection and the utilization of leaf-derived bioactive compounds in product development.
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    Antibacterial and anti-tyrosinase activities of the methanolic extracts from leaves of Tectona grandis
    (2018-12-01)
    Phonmakham, J.
    ;
    Wattanasuksakul, S.
    ;
    Poeaim, S.
    The antibacterial and anti-tyrosinase activities of methanolic extracts from fresh and fallen leaves of Tectona grandis (Teak) was studied. Fresh and fallen of teak leaves were collected from Thongphaphum and Phitsanulok silviculture research station. Antibacterial activity was determined by disc diffusion method with concentration at 500 µg/disc. Fresh and fallen of teak leaves extracts showed a good activity against Staphylococcus aureus and Staphylococcus epidermidis. In the other hand, fresh teak leaves inhibited growth of Propionibacterium acnes better than fallen teak leaves. The anti-tyrosinase activity was determined by Dopachrome method with concentration at 1500 µg/ml, inhibitory power of tyrosinase enzyme from fresh and fallen leaves extracts value were detected in the percentage between 35.45%-73.65%.