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Antioxidants of Salvia aegyptiaca L. residues depending on geographical origin

Ben Farhat, Mouna, Sotomayor, Jose A., Jordán, María J.
Biocatalysis and agricultural biotechnology 2019 v.17 pp. 486-491
2,2-diphenyl-1-picrylhydrazyl, Salvia aegyptiaca, antioxidant activity, antioxidants, food industry, high performance liquid chromatography, inhibitory concentration 50, iron, polyphenols, provenance, rosmarinic acid
Variations in polyphenolic contents and antioxidant capacities depending on the collection sites of Salvia aegyptiaca, were examined. Total polyphenolics assessed by the Folin-Ciocalteu procedure reached the values of 79.67 and 77.91 mg GAE/g DW in post-distilled Salvia aegyptiaca from Enfida and Chott Meriem. HPLC analysis permitted the identification of 14 phenolic components. Methyl carnosate (416.29–4052.24 µg/g DW), rosmarinic acid (562.46–1172.24 µg/g DW) and apigenin-7-glucoside (512.96–774.02 µg/g DW) were detected as the main phenolics. Samples of Chott Meriem were characterized by the best antioxidant performance as evaluated by DPPH (IC50, 29.62 µg/mL), ABTS (198.48 µM TE/mg) and FRAP (155.34 mM Fe(II)/mg) assays. Also, significant (p < 0.05) correlations were established between several identified phenolics and antioxidant tests. Residues of S. aegyptiaca might be valuable natural antioxidants and seemed to be useful in both pharmaceutical and food industries with appreciable health-promoting properties.