Lichenochemical Screening and Antioxidant Capacity of Four Tunisian Lichen Species |
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Authors: | Mohamed Mendili Marwa Bannour Maria Eduarda M. Araújo Mark R. D. Seaward Ayda Khadhri |
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Affiliation: | 1. University of Tunis El-Manar II, Faculty of Sciences, Plant Ecology Research Unit, Campus Academia, 2092 Tunis, Tunisia;2. Faculty of Sciences, Center of Chemistry and Biochemistry, University of Lisbon, Lisboan, Portugal;3. School of Archaeological and Forensic Sciences, University of Bradford, Bradford, BD7 1DP UK |
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Abstract: | 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 (IC50=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. |
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Keywords: | DPPH. FT-IR NMR QUENCHER lichenized fungi |
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