Evaluation of phenolic contents and antioxidant properties of the leaves and flowers of Phlomis biloba Desf.
2019
Merouane, A. | Saadi, A. | Noui, A. | Abd. Latif M.
The present work was undertaken to evaluate the antioxidant potentials (β-carotene-linoleic acid system and 2, 2-diphenyl-1-picrylhydrazyl, DPPH, free radical scavenging assay) andbioactive components of leaves and flowers of Phlomis biloba Desf. Results show that the leaf extract yielded higher total phenolics (153.46 ± 1.36 µg GAE/mg extract) and flavonoid contents (53.84 ± 0.24 µg QE/mg extract) as compared to the flower extract which yielded 81.33 ± 2.29 µg GAE/mg extract and 14.86 ± 0.21 µg QE/mg extract, respectively. However, the flower extract surpassed the leaf extract in flavonol content (06.22 ± 0.05 vs. 03.39 ± 0.06 µgRE/mg extract). The leaf extract had the strongest antioxidant potential as evaluated by DPPH (47.78 ± 1.12 mg/mL) and β-carotene bleaching assays (76.18 ± 0.98%) with high correlation to flavonoid contents. The present work introduced P. biloba as a potential bio-resource for antioxidants which can be further utilised in food applications.
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