Changes in phenolic profiling and antioxidant capacity of Salvia aegyptiaca L. by-products during three phenological stages

The current study was performed to evaluate the effect of the phenophase on the total phenolic contents, the concentration of individual phenolics and consequently on the antioxidant capacity of Salvia aegyptiaca by-products. The flowering period revealed the highest accumulation of total phenolic contents (69.49, 88.41 mg GAE/g DW) in the methanolic extracts of S. aegyptiaca post-distilled aerial parts, as estimated spectrophotometrically. The HPLC allowed the identification of fifteen phenolic compounds classified into phenolic acids, phenolic diterpenes and flavonoids. Rosmarinic acid (757.17-1702.82 mu g/g DW) and methyl camosate (775.42-1092.50 mu g/g DW) were the most abundant compounds, being the highest at the flowering phase. The DPPH and ABTS-radical scavenging assays and FRAP reducing power test exhibited good antioxidant properties with the best performance detected in the course of the flowering stage. S. aegyptiaca by-products would be able to promise sources of natural products such as phenolic antioxidant adjunct for food processing. (C) 2015 Elsevier Ltd. All rights reserved.