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Cuticular Waxes and Cutin in ITerminalia catappa/I Leaves from the Equatorial São Tomé and Príncipe Islands

Molecules (Basel, Switzerland), 2023-08, Vol.28 (17) [Peer Reviewed Journal]

COPYRIGHT 2023 MDPI AG ;ISSN: 1420-3049 ;EISSN: 1420-3049 ;DOI: 10.3390/molecules28176365

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  • Title:
    Cuticular Waxes and Cutin in ITerminalia catappa/I Leaves from the Equatorial São Tomé and Príncipe Islands
  • Author: Pereira, Helena ; Simões, Rita ; Miranda, Isabel
  • Subjects: Fatty acids ; Sterols
  • Is Part Of: Molecules (Basel, Switzerland), 2023-08, Vol.28 (17)
  • Description: This study presents for the first time an analysis of the content and chemical composition of the cuticular waxes and cutin in the leaves of the widespread and important tropical species Terminalia catappa. The leaves were collected in the equatorial Atlantic islands of São Tomé and Príncipe, in the Gulf of Guinea. The epicuticular and intracuticular waxes were determined via dichloromethane extraction and their chemical composition via GC-MS analysis, and the content and monomeric composition of cutin were determined after depolymerization via methanolysis. The leaves contained an epidermal cuticular coverage of 52.8 μg cm[sup.−2] of the cuticular waxes (1.4% of mass) and 63.3 μg cm[sup.−2] (1.5% of mass) of cutin. Cuticular waxes include mainly n-alkanols and fatty acids, with a substantial proportion of terpenes in the more easily solubilized fraction, and sterols in the more embedded waxes. Cutin is mostly constituted by C16 fatty acids and dihydroxyacids, also including aromatic monomers, suggesting a largely linear macromolecular arrangement. The high proportion of triacontanol, α-amyrin, β-amyrin, germanicol, and lupeol in the easily solubilized cuticular fraction may explain the bioactive properties attributed to the T. catappa leaves via the popular medicine, which allows us to consider them as a potential source for the extraction of these compounds.
  • Publisher: MDPI AG
  • Language: English
  • Identifier: ISSN: 1420-3049
    EISSN: 1420-3049
    DOI: 10.3390/molecules28176365
  • Source: DOAJ Directory of Open Access Journals
    GFMER Free Medical Journals
    PubMed Central
    Alma/SFX Local Collection
    ProQuest Central
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