Phytochemical study and antibacterial activity of different extracts of Pistacia lentiscus L collected from Dahra Region West of Algeria

The purpose of this study was to investigate the phytochemical proprieties, antioxidant and antibacterial activities of different extracts of Pistacia lentiscus on two pathogenic bacteria. The concentration of total phenols was analyzed using Folin-Ciocalteu’s method. Exracts of plant were evaluated for their antimicrobial activities against Staphylococcus aureus and Esherichia coli using the agar disk diffusion method and the minimal inhibitory concentration. The phytochemical study revealed the presence of major bioactive chemical constituents in different extracts of P. lentiscus (flavonoids, alkaloids, saponins, tannins, terpenoids, glycosides and steroids). Results showed that this plant has antioxydant activity and high quantity of total phenols and flavonoids. Antibacterial activity of the aerial parts of P. lentiscus against tested bacteria has shown that Gram-negative strains were more resistant compared to the Gram- positive ones. We can conclude that Pistacia lentiscus from Dahra region under investigation can be a potential source of useful drugs.Keywords: Pistacia lentiscus; Phytochemicals; total phenol; Flavonoids; Antibacterial activit

Effect of the chelating agents on bio-sorption of hexavalent chromium using Agave sisalana fibers

International audienc

Influence of plant and environment parameters on phytochemical composition and biological properties of Pistacia atlantica Desf

The aim of the current study is to analyze the phytochemical, antioxidant and antimicrobial activities of 34 extracts prepared from Pistacia atlantica Desf. subsp. atlantica, according to gender, organ type (roots, buds and fruits), geographical location and stage of ripening. Bud extracts exhibited the highest phenolic content (565.74 ± 9.84 mg GAE/g DM), followed by fruit and root extracts. TFC and TTC ranged from 0.38 ± 0.03 to 1.92 ± 0.11 mg CE/g DM and from 0.37 ± 0.03 to 16.54 ± 0.94 mg CE/g DM, respectively. For DPPH and TAC assays, the values varied from 0.038 ± 0.000 to 1.331 ± 0.114 mg/mL and 1.58 ± 0.06 to 43.64 ± 2.58 mg AAE/g DM, respectively. Besides, bud extracts showed the highest bioactivity against pathogenic bacteria and a slight antifungal effect. Additionally, HPLC-DAD analysis revealed that the caffeic acid and the dimethyl-allyl caffeic acid characterized the bud extract, while the rutin and the hydroxytyrosol were abundant in the red fruit extract. The present evidence suggests that P. atlantica may be considered as a potential source of new additives for therapeutic, food and cosmetic products

Leaf-buds of Pistacia atlantica: a novel source of bioactive molecules with high anti-inflammatory, antioxidant, anti-tyrosinase and antimicrobial properties

In this study, for the first time, the anti-inflammatory, antioxidant, anti-tyrosinase and antimicrobial property of P. atlantica Desf. subsp. atlantica leaf-bud extract have been investigated. The anti-inflammatory activity was determined in vivo by reducing carrageenan-induced hind paw edema in mice, while the antiradical function was evaluated using DPPH, total antioxidant capacity (TAC) and reduction power assays. The extract induced a significant reduction of the edema, from 1 to 6 h in a dose-dependent manner (150, 200 and 300 mg/kg). Histological observations of the inflamed tissues also confirmed this. An effective antioxidant activity of the plant samples was demonstrated, showing an EC50 = 0.183 ± 0.005 mg/mL for the DPPH test, a value of 28.776 ± 2.541 mg AAE/g for the TAC and an EC50 = 0.136 ± 0.003 mg/mL for reducing power. The leaf-bud extract also revealed a good antimicrobial activity against S. aureus and L. monocytogenes (mean diameter of inhibition zones of 13.2 and 17.0 mm, respectively), while a slight antifungal effect was observed. The plant preparation was then documented to inhibit tyrosinase activity, with an EC50 value of 0.098 ± 0.00 mg/mL in a dose-dependent manner. HPLC–DAD analysis revealed that dimethyl-allyl caffeic acid and rutin were the most abundant molecules. The current data documented that P. atlantica leaf-bud extract has strong biological properties and constitutes a potential source of pharmacological molecules