CHEMICAL COMPOSITION, ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF ALOYSIA TRIPHYLLA L. ESSENTIAL OILS AND METHANOLIC EXTRACT
AbstractThe essential oil variability of Aloysia triphylla aerial parts collected from four different Tunisian regions was assessed. In addition, total polyphenols, flavonoids, and condensed tannins as well as antioxidant, antibacterial, and antifungal activities of methanolic extract and essential oils were undertaken. Chromatographic analysis of A. triphylla essential oils showed the predominance of monoterpene aldehydes represented mainly by neral and geranial. RP-HPLC analysis of A. triphylla methanolic extract revealed the predominance of p-coumaric acid among the 15 phenolic acids identified. Antiradical activity was region-dependant and the methanolic extract of Kairouan region has the strongest activity. Concerning the reducing power, the methanolic extract of Kairouan, Siliana, Kairouan, and Gabes regions was less active than the positive control. Siliana region showed the lowest ability to prevent the bleaching of β-carotene, whereas Kairouan region exhibited the strongest activity. Obtained results of antimicrobial and antifungal activities showed that A. triphylla essential oil is endowed with important antibacterial and antifungal performances. As a whole, based on its methanolic extract and essential oil features, A. triphylla may be considered as a valuable source for new multipurpose products for industrial, cosmetic, and pharmaceutical utilization.
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