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Lichenochemical Screening and Antioxidant Capacity of Four Tunisian Lichen Species
Author(s) -
Mendili Mohamed,
Bannour Marwa,
Araújo Maria Eduarda M.,
Seaward Mark R. D.,
Khadhri Ayda
Publication year - 2021
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.202000735
Subject(s) - chemistry , dpph , phenols , proanthocyanidin , acetone , lichen , flavonoid , antioxidant , composition (language) , food science , botany , polyphenol , organic chemistry , biology , linguistics , philosophy
The phenolic composition and antioxidant capacity of four Tunisian lichen species, Cladonia rangiformis , Flavoparmelia caperata , Squamarina cartilaginea and Xanthoria parietina , were determined in order to provide a better understanding of their lichenochemical composition. Powdered material of F. caperata was the richest in total phenolic content (956.68 μg GAE g −1 DW) and S. cartilaginea in proanthocyanidin content (77.31 μg CE g −1 DW), while the acetone extract of X. parietina showed the highest flavonoid content (9.56 μg CE g −1 DW). The antioxidant capacity of all lichen extracts and crude material was evaluated by DPPH . scavenging, iron‐chelating, and iron‐reducing powers. Results showed that methanol extracts of S. cartilaginea had the highest DPPH . antioxidant capacity (IC 50 =0.9 μg mL −1 ) and the highest iron‐reducing power was attributed to the acetone extract of this species. All extracts of all species were further screened by Fourier‐transform infrared spectroscopy (FT‐IR) and nuclear resonance spectroscopy (NMR); results showed an abundance of phenols, aromatic compounds, and fatty acids. Overall, our results showed that the investigated species are a rich source of potentially bioactive compounds with valuable properties.