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Toxicity of Aqueous Extracts of the Leaves of Sonneratia caseolaris Grown in Ujung Pangkah, Gresik, East Java
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Researchers investigated the toxicity and bioactive compounds of mangrove leaf extracts from a site near industrial waste in Indonesia, finding the extracts non-toxic but detecting phthalate plasticizers — known carcinogens — suggesting the surrounding environment is contaminated with plastic waste.
Local communities have extensively utilized different components of mangrove (Sonneratia caseolaris) plants in traditional medicine. These plants are known for their secondary metabolites, including steroids, triterpenoids, saponins, and flavonoids. S. caseolaris grows in Ujung Pangkah waters in Gresik, East Java, Indonesia, and is known for its proximity to environmental waste. It is believed that environmental factors at this site may contribute to the presence of characteristic bioactive compounds in the plant. In this study, the toxicity, bioactive constituents, and pharmacokinetic potentials of the aqueous extracts of the leaves of S. caseolaris were investigated. S. caseolaris leaves were extracted with methanol, distilled water, and three mineral water products produced and distributed in Indonesia. The toxicity of the aqueous S. caseolaris leaf extracts was tested by determining the LC50 using Artemia salina Leach and a 2,5-diphenyl-2H-tetrazolium bromide (MTT) assay with TIG-1-20 lung fibroblasts. None of the aqueous S. caseolaris leaf extracts were categorized as toxic substances based on the LC50 and MTT assays. The six compounds detected by liquid chromatography high-resolution mass spectrometry (LC–HRMS) in a previous study were analyzed using quantitative structure-activity relationship (QSAR) and absorption, distribution, metabolism, excretion, and toxicity (ADMET) methods. Bis(3,5,5-trimethylhexyl) phthalate and bis(2-ethylhexyl) phthalate were identified as component from S. caesolaris and are known plasticizers. These compounds were suspected to be carcinogenic substances based on QSAR and ADMET analyses, indicating that the environment of S. caseolaris may be a site of plastic waste.
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