title: Assessment of the phytochemical constituents and antioxidant activity of a bloom forming microalgae Euglena tuba.
abstract: BACKGROUND
  Unstable generation of free radicals in the body are responsible for many degenerative diseases. A bloom forming algae Euglena tuba growing abundantly in the aquatic habitats of Cachar district in the state of Assam in North-East India was analysed for its phytochemical contents, antioxidant activity as well as free radical scavenging potentials.
  
  
  RESULTS
  Based on the ability of the extract in ABTS•+ radical cation inhibition and Fe3+ reducing power, the obtained results revealed the prominent antioxidant activity of the algae, with high correlation coefficient of its TEAC values to the respective phenolic and flavonoid contents. The extract had shown its scavenging activity for different free radicals and 41.89 ± 0.41 μg/ml, 5.83 ± 0.07 μg/ml, 278.46 ± 15.02 μg/ml and 223.25 ± 4.19 μg/ml were determined as the IC50 values for hydroxyl, superoxide, nitric oxide and hypochlorous acid respectively, which are lower than that of the corresponding reference standards. The phytochemical analysis also revealed that the phenolics, flavonoids, alkaloids, tannins and carbohydrates are present in adequate amount in the extract which was confirmed by HPLC analysis.
  
  
  CONCLUSIONS
  The results showed that 70% methanol extract of the algae possesses excellent antioxidant and free radical scavenging properties.
authors.forename: Dipankar
authors.initials: D
authors.lastname: Chaudhuri
authors.forename: Nikhil Baban
authors.initials: NB
authors.lastname: Ghate
authors.forename: Shampa
authors.initials: S
authors.lastname: Deb
authors.forename: Sourav
authors.initials: S
authors.lastname: Panja
authors.forename: Rhitajit
authors.initials: R
authors.lastname: Sarkar
authors.forename: Jayashree
authors.initials: J
authors.lastname: Rout
authors.forename: Nripendranath
authors.initials: N
authors.lastname: Mandal
mesh_terms: D000470:Alkaloids / Q000032:analysis; D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D001205:Ascorbic Acid / Q000032:analysis; D002457:Cell Extracts / Q000737:chemistry*; D002839:Chromans / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D005055:Euglena / Q000737:chemistry*; D005419:Flavonoids / Q000032:analysis; D016166:Free Radical Scavengers / Q000378:metabolism*; D005947:Glucose / Q000032:analysis; D007194:India; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D000432:Methanol; D051379:Mice; D058086:Microalgae; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis; D019163:Reducing Agents / Q000378:metabolism*; D013634:Tannins / Q000032:analysis
chemical_list: D000470:Alkaloids; D000975:Antioxidants; D002457:Cell Extracts; D002839:Chromans; D005419:Flavonoids; D016166:Free Radical Scavengers; D010636:Phenols; D019163:Reducing Agents; D013634:Tannins; D005947:Glucose; D001205:Ascorbic Acid; C010643:6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid; D000432:Methanol