title: Separation and characterization of antioxidants from Spirulina platensis microalga combining pressurized liquid extraction, TLC, and HPLC-DAD.
abstract: A new procedure has been developed to separate and characterize antioxidant compounds from Spirulina platensis microalga based on the combination of pressurized liquid extraction (PLE) and different chromatographic procedures, such as TLC, at preparative scale, and HPLC with a diode array detector (DAD). Different solvents were tested for PLE extraction of antioxidants from S. platensis microalga. An optimized PLE process using ethanol (generally recognized as safe, GRAS) as extraction solvent has been obtained that provides natural extracts with high yields and good antioxidant properties. TLC analysis of this ethanolic extract obtained at 115 degrees C for 15 min was carried out and the silica layer was stained with a DPPH (diphenyl-pycril-hydrazyl) radical solution to determine the antioxidant activity of different chromatographic bands. Next, these colored bands were collected for their subsequent analysis by HPLC-DAD, revealing that the compounds with the most important antioxidant activity present in Spirulina extracts were carotenoids, as well as phenolic compounds and degradation products of chlorophylls.
authors.affiliation: Sección Departamental Ciencias de la Alimentación, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, Madrid, Spain.
authors.forename: Laura
authors.initials: L
authors.lastname: Jaime
authors.forename: José A
authors.initials: JA
authors.lastname: Mendiola
authors.forename: Miguel
authors.initials: M
authors.lastname: Herrero
authors.forename: Cristina
authors.initials: C
authors.lastname: Soler-Rivas
authors.forename: Susana
authors.initials: S
authors.lastname: Santoyo
authors.forename: F Javier
authors.initials: FJ
authors.lastname: Señorans
authors.forename: Alejandro
authors.initials: A
authors.lastname: Cifuentes
authors.forename: Elena
authors.initials: E
authors.lastname: Ibáñez
mesh_terms: D000975:Antioxidants / Q000032:analysis* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D000458:Cyanobacteria / Q000737:chemistry*; D013053:Spectrophotometry
chemical_list: D000975:Antioxidants