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Aloysia triphylla L, regions, phenolic, essential oils, antioxidant activity, antimicrobial activity
The essential oil variability in aerial parts of Aloysia triphylla, 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 determined. Chromatographic analysis of Aloysia triphylla essential oils showed the predominance of monoterpene aldehydes represented mainly by neral and geranial. RP-HPLC analysis of Aloysia triphylla methanolic extract revealed the predominance of p-coumaric acid among the 15 phenolic acids identified. Antiradical activity was region-dependent and the methanolic extract of Kairouan sample had the strongest activity. Concerning the reducing power, the methanolic extract of Kairouan, Siliana, Kairouan, and Gabes samples were less active than the positive control. Siliana sample showed the least ability to prevent the bleaching of B-carotene, whereas Kairouan sample exhibited the strongest activity. Obtained results of antimicrobial and antifungal activities showed that Aloysia triphylla essential oil was endowed with important antibacterial and antifungal properties. Overall, based on its methanolic extract and essential oil features, Aloysia triphylla may be considered as a valuable source of new multipurpose products for industrial, cosmetic, and pharmaceutical utilization.
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