DPPH antiradical activity and total phenolic content of methanol and ethanol extracts from macroalgae (Ulva rigida) and microalgae (Chlorella)

Introduction: Algae are widely popular as dietary supplement. Furthermore, they can be a great source of antioxidants (pigments, alkaloids, carotenoids, phenolic acids, sulfated polysaccharides and long-chain polyunsaturated fatty acids etc.) and can be used instead of synthetic ones. The different nutrient compositions of algae depend on class, species, habitats, maturity, and environmental conditions. Aim: The present study aims to investigate the differences in the antioxidant activity (AOA) and total phenolic content (TPC) of macroalgae Ulva rigida from the Black Sea and microalgae Chlorella . In addition, the obtained results will show their potential as natural sources of antioxidants. Materials and Methods: The marine macroalgae Ulva rigida and the microalgae Chlorella were used to perform different solvent extracts, which were analyzed for antiradical activity and total phenol content. Results and Discussion: All analyzed extracts (methanol and ethanol) showed positive results of the DPPH test and TPC. Both methanol extracts of microalgae Chlorella and macroalgae Ulva rigida had higher scavenging effect on used radicals for antioxidant activity compared to both ethanol extracts of the same plant material. The results show high potential as natural source of antioxidants of both algae species due perhaps to the phenolic content and other compounds having antioxidant activity. Conclusion: Both Ulva rigida and Chlorella can be used as a source of antioxidants and phenolic acids, which can be added to new functional foods and supplements, as well as be the basis of pharmaceutical and cosmetic products.