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Glucosinolate profiles by HPLC-DAD, phenolic compositions and antioxidant activity of Eruca vesicaria longirostris: Impact of plant part and origin

Saoussen Bouacida, Hayet Ben Haj koubaier, Ahmed Snoussi, Marie Laure Fauconnier, Nabiha Bouzouita


The glucosinolate profiles, phenol and flavonoid contents and the antioxidant activity of Eruca vesicaria longirostris were studied for different organs and origins. Eleven desulpho-glucosinolates (DS-GLSs) were isolated and quantified by lipid chromatography- DAD. Similarity between profiles was obtained. Total DS-GLS content, expressed as sinigrin equivalents (SE) revealed a certain variabilily ranging between (76.07-45.61), (27.01-13.53), (4.52 -18.01), (9.39-3.37) and (1.16-13.99) µmol /g DW for seeds, flowers, leaves, roots and stems, respectively. Results showed that seeds are rich in phenolics as they contain highest amounts of phenolics ranging from 27.6±0.5 to 33.47±0.5 mg GAE/g extract as compared to all other parts. Leaves and flowers had a significantly higher total phenolic content than stems and roots in all samples (p < 0.05). According to statistical analysis, the investigated seed extracts with values between (16.20±0.10-18.50±0.10 mg QE/g) exhibited the highest total flavonoids content, followed by leaves (13.00±0.40-15.80±0.30mg QE/g), flowers (10.40±0.40-12.90±0.90 mg QE/g) and stems (7.80±0.20- 9.80±0.70 mg QE/g). Antioxidant activity tested by DPPH, ABTS and FRAP assays, was higher for seeds, leaves and flowers than the other studied organs. These organs were characterized by a significantly high content in glucoerucin, nasturtin and epiprogroitrin, respectively.

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