03090nas a2200229 4500008004100000245016100041210006900202260001800271300001000289490000700299520230700306653001802613653002602631653001202657653001902669653003502688100001602723700001502739700002902754700001702783856006002800 2022 eng d00aAnalysis of Bioactive Compounds from Different Algae Samples Extracted with Ultrasound: Characterizations, Phytochemical Contents and Antioxidant Potentials0 aAnalysis of Bioactive Compounds from Different Algae Samples Ext cDecember 2021 a35-440 v143 a

Introduction: Algae are a significant bioactive compounds source, with variation in biological functions including antioxidant, anti-inflammatory and antiviral. Both microalgae and macroalgae biomass are a rich source of high value nutraceuticals and other bio products of commercial value, making algae worth investigating into. Objectives: To analyze bioactive phytochemicals and their antioxidants properties of extracts from algae from lake Taihu, Microcystis aeruginosa, Spirogyra and Seaweed extracted with ultrasound assisted method in comparison to the traditional extraction method, and a subsequent use of the residue in producing biochar. Materials and Methods: The different algae species viz Microcystis aeruginosa, Spirogyra and Seaweed were subjected to ultrasonic and thermostatted water bath extraction with a 70% ethanol and 30% water (v/v) as solvent. The extracts were characterized using gas chromatography-mass spectrometry. The total phenol and flavonoid and antioxidant activities were assessed in vitro viz hydroxyl radical (•OH) scavenging activity, ferric- reducing antioxidant property, total antioxidant capacity and 1, 1‑diphenyl‑2‑picrylhydrazyl (DPPH) activity. Results: The chemical analysis indicated the existence of bioactive compounds such as alkaloids, phenols, tannins, flavonoids, terpenoids, steroids, proteins, carbohydrates, phytosterols, quinones, saponins, coumarins and glycosides. In vitro screening of the extracts also showed good antioxidant capacity (hydroxyl radical (•OH) scavenging activity, ferricreducing antioxidant property, total antioxidant capacity and 1, 1‑diphenyl‑2‑picrylhydrazyl (DPPH) activity), the extracted compounds are of biological and pharmacological importance. The ultrasound assisted extraction method significantly increased yield with 27.0% in comparison to conventional method with 18.6%. Conclusion: The study showed the different algae species were enriched with phytochemicals and that the ultrasound assisted method was an effective extraction method environmentally benignant. A complete utilization of algae biomass was achieved after biochar was made from the residue.

10aAlgae species10aAntioxidant activity.10aethanol10aPhytochemicals10aUltrasound assisted extraction1 aWizi, Jakpa1 aNi, Lixiao1 aDarkwah, Williams, Kweku1 aXianglan, Li uhttps://phcogres.com/fulltext/v14i1/105530pres1417.html