title: Raman spectroscopic study of antioxidant pigments from cup corals Tubastraea spp.
abstract: Chemical investigation of nonindigenous Tubastraea coccinea and T. tagusensis by Raman spectroscopy resulted in the identification of carotenoids and indolic alkaloids. Comparison of Raman data obtained for the in situ and crude extracts has shown the potential of the technique for characterizing samples which are metabolic fingerprints, by means of band analysis. Raman bands at ca. 1520, 1160, and 1005 cm(-1) assigned to ν1(C═C), ν2(C-C), and ρ3(C-CH3) modes were attributed to astaxanthin, and the band at 1665 cm(-1) could be assigned to the ν(C-N), ν(C-O), and ν(C-C) coupled mode of the iminoimidazolinone from aplysinopsin. The antioxidant activity of the crude extracts has also been demonstrated, suggesting a possible role of these classes of compounds in the studied corals.
authors.affiliation: NEEM Núcleo de Espectroscopia e Estrutura Molecular, Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora , 36036-330 Juiz de Fora, MG, Brazil.
authors.forename: Lenize F
authors.initials: LF
authors.lastname: Maia
authors.forename: Gilson R
authors.initials: GR
authors.lastname: Ferreira
authors.forename: Regina C C
authors.initials: RC
authors.lastname: Costa
authors.forename: Nanci C
authors.initials: NC
authors.lastname: Lucas
authors.forename: Rodolfo I
authors.initials: RI
authors.lastname: Teixeira
authors.forename: Beatriz G
authors.initials: BG
authors.lastname: Fleury
authors.forename: Howell G M
authors.initials: HG
authors.lastname: Edwards
authors.forename: Luiz F C
authors.initials: LF
authors.lastname: de Oliveira
mesh_terms: D000818:Animals; D037421:Anthozoa / Q000737:chemistry*; D000975:Antioxidants / Q000032:analysis*; D002338:Carotenoids / Q000032:analysis*; D026121:Indole Alkaloids / Q000032:analysis*; D015394:Molecular Structure; D010860:Pigments, Biological / Q000032:analysis*; D011789:Quantum Theory; D013059:Spectrum Analysis, Raman
chemical_list: D000975:Antioxidants; D026121:Indole Alkaloids; D010860:Pigments, Biological; D002338:Carotenoids