Colour diversification in octocorals based on conjugated polyenes: A Raman spectroscopic view

Authors

  • Lenize F. Maia,

    1. NEEM - Núcleo de Espectroscopia e Estrutura Molecular, Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
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  • Vanessa E. de Oliveira,

    1. Departamento de Física e Matemática, Universidade Federal Fluminense, Polo Rio das Ostras, RJ, Brazil
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  • Maria E. R. Oliveira,

    1. NEEM - Núcleo de Espectroscopia e Estrutura Molecular, Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
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  • Felipe D. Reis,

    1. NEEM - Núcleo de Espectroscopia e Estrutura Molecular, Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
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  • Beatriz G. Fleury,

    1. Departamento de Ecologia, IBRAG, Universidade do Estado do Rio de Janeiro – UERJ, Rio de Janeiro, RJ, Brazil
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  • Howell G. M. Edwards,

    1. Chemical and Forensic Sciences, School of Life Sciences, University of Bradford, Bradford, West Yorkshire, United Kingdom
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  • Luiz F. C. de Oliveira

    Corresponding author
    • NEEM - Núcleo de Espectroscopia e Estrutura Molecular, Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
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Correspondence to: Luiz F. C. de Oliveira, 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.

E-mail: luiz.oliveira@ufjf.edu.br

Abstract

Polyenic pigments in octocorals have been investigated by Raman spectroscopy using laser excitation at 532, 785 and 1064 nm. The spectral features suggest the structural nature of carotenoids from Phyllogorgia dilatata, Leptogorgia punicea, Muricea atlantica, Carijoa riisei and conjugated polyenals from L. punicea, L. setacea, Muricea flamma and Renilla muelleri. The observed vibrational bands at ca. 1540–1520 ν1(C=C), 1159 ν2(C–C) and 1005 cm−1 ρ3(C–CH3) were assigned to carotenoids, whereas the identification of non-methylated conjugated polyenals have been proposed due to two major Raman bands at ca. 1500 and 1120 cm-1, assigned to ν(C=C) and ν(C–C), respectively. Copyright © 2012 John Wiley & Sons, Ltd.

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