Phytochemical Screening, Extraction of Essential Oils and Antioxidant Activity of Five Species of Unconventional Vegetables

Abstract

Unconventional vegetables, in general, are plants that have been largely consumed by the population at some point and, because of changes in eating behavior, now present reduced economic and social expression and have lost ground to other vegetables. The objectives of this study were to perform phytochemical screening of the ethanol extracts of Rumex acetosa L., Tropaeolum majus L., Solanum muricatum, Stachys byzantina K. Koch and Solanum betaceum Cav. and evaluate their antioxidant potentials via the methods involving scavaging of the DPPH free radical and the ABTS radical, phosphomolybdenum and reducing power. In phytochemical screening, five species of unconventional vegetables tested positive for tannins; for sesquiterpene, lactones and other lactones. These tests were positive for Tropaeolum majus L. and Rumex acetosa L., Solanum betaceum Cav. and Solanum muricatum tested negative for steroids. Only Solanum betaceum Cav. gave positive tests for flavonoids. Among the five plant species studied, Stachys byzantina K. Koch presented the greatest antioxidant potential in all the methods evaluated.

Antimalarial Activity of Aqueous Extracts of Nasturtium (Tropaeolum majus L.) and Benzyl Isothiocyanate

“…To maximize the benzyl glucosinolate extraction without inactivating the myrosinase, we used aqueous extraction at room temperature instead of organic solvents. Also, we wanted to extract benzyl glucosinolate with less income of other compounds, such as alkaloids, flavonoids and tannins, that are present in methanolic extracts and tannins and steroids present in ethanolic extracts [14,43].…”

Comparative Study Evaluating Phytochemical Screening, Functional Groups Analysis, and Antimicrobial Activity of Tropaeolum Majus L. Leaves, Flowers, and Fruits

“…However, according to Scio et al (2012) this plant is devoid of tannins, and provided with flavonoids. Conversely, according to Carvalho et al (2015) T. majus is devoid of flavonoids, and provided with tannins. Furthermore, anthocyanins' presence in this plant has been reported in other studies (Brondani et al, 2016).…”

Evaluation of in vitro Schistosomicidal and Trypanocidal Activity of Leaf Extracts of Hancornia speciosa

“…The phytochemical analysis was performed according to the literature (Marinho et al, 2022;Matos, 1988;Menezes Filho et al, 2018;Sousa Carvalho et al, 2015). The final part of the ethanolic extract was suspended in water at concentration of 150 mg mL -1 , with 3 mL used for each experimental determination.…”