title: In vitro antioxidant activities of selected seaweeds from Southeast coast of India.
abstract: OBJECTIVE
  In vitro antioxidant activities of three selected Indian seaweeds viz., Halimeda tuna (H. tuna), Turbinaria conoides (T. conoides) and Gracilaria foliifera (G. foliifera) were evaluated.
  
  
  METHODS
  Total antioxidant activity, total phenolic content, and reducing power of crude methanol and diethyl ether extracts were determined.
  
  
  RESULTS
  Total phenolic content and total antioxidant activity were higher (1.231±0.173 mg GAE/g, 1.675± 0.361 mg GAE/g) in T. conoides respectively. Reducing power of crude methanol extract increased with concentrations of the extract. The Fourier transform-infra red spectrum analysis revealed the presence of polyphenolic signals. The seaweed extracts displayed moderate antioxidant activity compared to gallic acid standard.
  
  
  CONCLUSIONS
  The seaweeds could be considered for curing diseases from oxidative deteriorations.
authors.affiliation: Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai- 608502, Tamil Nadu, India.
authors.forename: Gopalraj Karthikai
authors.initials: GK
authors.lastname: Devi
authors.forename: Karunamoorthy
authors.initials: K
authors.lastname: Manivannan
authors.forename: Ganapathy
authors.initials: G
authors.lastname: Thirumaran
authors.forename: Fatimson Arockiya Aarthi
authors.initials: FA
authors.lastname: Rajathi
authors.forename: Perumal
authors.initials: P
authors.lastname: Anantharaman
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D007194:India; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D012623:Seawater; D012624:Seaweed / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D000975:Antioxidants; D010636:Phenols; D010936:Plant Extracts