Abstract
The marine environment is abundant in natural products that are beneficial to humans. Among these compounds are the polyphenols produced by marine flora as secondary metabolites and used as a defense against stressful environmental conditions. Accordingly, recent pharmacological and biomedical studies showed that polyphenols from marine and coastal floras have several important bioactivities including antioxidant property. In this study, we measured the total polyphenol content (TPC) of 75 species of marine-associated flora. The TPC of their methanolic extracts was measured spectrophotometrically using the Folin-Ciocalteu assay and was expressed both as mg phloroglucinol equivalent per g of dry weight (mg PGE g−1 DW) and as mg gallic acid equivalent per g dry weight (mg GAE g−1 DW). The TPC values are higher when expressed in terms of GAE compared to PGE. Also, the mean TPC of tracheopytes (229 ± 43.0 mg PGE g−1 DW) was higher compared to the mean TPC of macroalgae (69.4 ± 9.59 mg PGE g−1 DW). For macroalgae, ochrophytes (97.9 ± 22.7 mg PGE g−1 DW) had the highest mean TPC followed by chlorophytes (80.0 ± 20.5 mg PGE g−1 DW) and rhodophytes (49.5 ± 8.60 mg PGE g−1 DW). Moreover, our study also showed that TPC varied between young and mature tissues, among different color morphotypes and different parts of the plants. Although the concentrations of total polyphenols varied among species, ages, strains and parts of the plant, our study showed that marine and coastal floras are rich sources of polyphenols that could be further examined for their biological activities and other applications in food industry.
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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This is contribution no. 498 from the Marine Science Institute, University of the Philippines (UPMSI), Diliman. We, the Algal Ecophysiology (AlgaE) team, are thankful to our laboratory aides Jerry Arboleda and Guillermo Valenzuela and to our institute driver Wilfredo de Guzman for their help in the collection and processing of our samples. We are also thankful to the Bolinao Marine Laboratory (BML) for providing us a venue to analyze our samples.
Funding
This study was subsidized by the UPMSI inhouse research grant, the DOST-PCAARRD funded project “Resource Inventory, Valuation and Policy in Ecosystem Services under Threat: the case of the West Philippine Sea (REINVEST-WPS)” and the CHED-LAKAS funded project “Phytochemical Characterization of Macroalgae for Food and High Value Products (PhycoPRO).”
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BCV Narvarte: Methodology, Investigation, Data Curation, Formal Analysis, Validation, Visualization, Writing- Original Draft.
LAR Hinaloc: Investigation, Visualization, Writing- Review & Editing.
TGT Genovia, SMC Gonzaga, AMT Tabonda-Nabor, FMR Palecpec: Investigation, Writing- Review & Editing.
HM Dayao: Investigation.
MY Roleda: Funding acquisition, Project administration, Supervision, Conceptualization, Methodology, Investigation, Validation, Resources, Writing- Review & Editing.
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Narvarte, B.C.V., Genovia, T.G.T., Hinaloc, L.A.R. et al. Total polyphenol content of tropical marine and coastal flora: Potentials for food and nutraceutical applications. J Appl Phycol 35, 2431–2443 (2023). https://doi.org/10.1007/s10811-023-03024-w
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DOI: https://doi.org/10.1007/s10811-023-03024-w