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Polyphenols and triterpenes in leaves and extracts from three Nicotiana species

2019; Volume: 7; Issue: 5 Linguagem: Inglês

10.7324/jabb.2019.70508

2455-7005

Venelina Popova, Tanya Ivanova, Albena Stoyanova, V. Nikolova, Tsveta Hristeva, Mаrgarita Docheva, Nikolay Nikolov, Ivan Iliev,

Toxin Mechanisms and Immunotoxins

Genus Nicotiana (Solanaceae) includes 76 species, among which only Nicotiana tabacum L. (common tobacco) is recognized as economically important.Nicotiana species synthesize various secondary metabolites with biological or ecological activities, but many of them still have not been sufficiently studied.The objective of current study was to determine the content of selected groups of metabolites (e.g., phenolic acids, flavonoids, and triterpenes) in the leaves and extracts of three Nicotiana species (Nicotiana alata Link and Otto, Nicotiana rustica L., and N. tabacum L.), grown side by side.The results from the high-performance liquid chromatography identification of polyphenols and triterpenes in leaves and extracts showed considerable variations between the species.All of them, however, were characterized as plant materials containing various specialized and bioactive metabolites, which substantiate their consideration as a valuable source for obtaining different phytoproducts.In terms of the studied groups of bioactive metabolites, the results from the study suggest that 50% and 70% ethanol are the most suitable solvent concentrations for the extraction of N. alata, N. rustica, and N. tabacum leaves.The high content of polyphenols and triterpenes in the extracts provides grounds for their use in various cosmetic and pharmaceutical products, which could be the subject of future research.