Analysis of Brazilian Plant Extracts as Potential Source of Antioxidant Natural Products Using Bench-Top Assays

Introduction: The present work reported the antioxidant and chemical screening of Brazilian plant aqueous and organic extracts. Methods: An amount of 895 Brazilian Amazon aqueous and organic plant extracts were tested in thin layer chromatography plates (TLC) using 2, 2-diphenyl-1-picrylhydrazyl (DPPH), β-carotene, Dragendorff’s reagent, Kedde’s reagent, and KOH reagent so as to evaluate antioxidant activity and chemical profiles. Antioxidant and DPPH free radical scavenging activities results were submitted to chi-square analyses. Results: Only 8.60% of the extracts showed β-carotene/bleaching response, while 96.09% of the extracts responded as a radical scavenger, alkaloids occurred in 8.0% of the extracts whereas anthraquinones occurred in 0.89% of the extracts and cardenolides in 3.89% of the extracts. Conclusion: Present findings described that Amazon plant extracts have a huge potential to be a source of antioxidant compounds to be used in preventive medicine, as well as the chemical screening revealed that their plants can be strategically assessed as a source of alkaloids to be tested in further biological assays.