Antioxidant activities of some edaphic algae in Egypt

Abstract

Background Algae in general characterized by their rich content of biological compounds. However, few studies were conducted on the soil-inhabiting algae and their antioxidant characteristics. Results The present study was designed to evaluate the antioxidant activity of four edaphic algae including one on-soil alga (Vaucheria geminata) and three axenic isolated in-soil algae (Pleurochloris pyrenoidosa, Botrydiopsis eriensis, and Scenedesmus obliquus). Total antioxidant activity by Phosphomolybdenum assay ranged from 6.66 to 36.33 mg of Asc/g dwt; meanwhile, the percentage inhibition of DPPH radical was up to 97.37%. Antioxidant activity of each alga was assessed also by measuring their contents of total phenols, flavonoids, and pigments (chlorophyll a and carotenoids). B. eriensis and S. obliquus recorded the highest levels of phenols, flavonoids, and chlorophyll a followed by P. pyrenoidosa and V. geminata, while B. eriensis showed the highest carotenoids content. Moreover, about seven types of each phenol and flavonoid compound were identified by HPLC chromatography in the four algae under investigation. The most common detected phenols were gallic, chlorogenic, caffeic, and ferulic, while rutin, quercetin, apigenin, and quercitrin were the most abundant flavonoids among all algae under investigation. Conclusion All the tested algae were characterized with high antioxidant activities besides the rich contents of compounds with antioxidant properties which recommend their further potential using in nutritional, pharmaceutical, and medicinal implications.

Mechanism of macroalgae Gracilaria bailiniae responding to cadmium and lanthanum

“…Furthermore, DAMs up-regulated pathways were mainly focused on flavonoid biosynthesis, supporting the results of the significant up-regulated DAMs in the La treatment. Quercitrin is also considered an antioxidant flavonol in algae and plants experiencing metal stress (Skoŕzy ska- Polit et al, 2004;El-Tablawy et al, 2020). Finally, eicosatetraenoic acid is considered an evolutionarily conserved defense signalling molecule that modulates algae and plant stress signalling networks (Shanab et al, 2018;Tan et al, 2022).…”

Apoptotic Mechanisms of Quercetin in Liver Cancer: Recent Trends and Advancements

“…Though the induction of antioxidant effects in the prevention and treatment of cancer is obvious, as plants are good sources of antioxidants [ 16 , 17 , 18 ]. A study has shown the antioxidative properties present in soil algae ( Pleurochloris pyrenoidosa , Botrydiopsis eriensis , and Scenedesmus obliquus ) which was attributed to the presence of flavonoid compounds like quercetin [ 19 ]. In addition, another report has described anticancer and antioxidant activities of some algae such as Chlorophyta ( Ulva lactuca , and Codium tomentosum ), Phaeophyta ( Cystoseira crinita , Cystoseira stricta , and Sargassum vulgare ), and Rhodophyta ( Gelidium latifolium , Hypnea musciformis , and Jania rubens ).…”

Assessment of antioxidant activity in Vaucheria sessilis extracts and their efficacy against isolated Candida spp. from diabetic foot ulcers

“…The most important previous studies on the genus Vaucheria show its chemical compounds and their importance as antioxidants and antimicrobials according to the results of a spectrophotometer analysis of the total phenolic compounds present in a methanol extract of V. geminata, results were given as gallic acid equivalent (Vuran et al, 2012). In the study El-Tablawy et al (2020), HPLC chromatography was used to identify roughly seven varieties of each phenol and flavonoid chemical in the four algae (Vaucheria geminate, Pleurochloris pyrenoidosa, Botrydiopsis eriensis, and Scenedesmus obliquus). Gallic, chlorogenic, caffeic, and ferulic were the most often found phenols, while rutin, quercetin, apigenin, and quercitrin were the most prevalent flavonoids among all the investigated algae.…”