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Colour diversification in octocorals based on conjugated polyenes: A Raman spectroscopic view
Author(s) -
Maia Lenize F.,
Oliveira Vanessa E.,
Oliveira Maria E. R.,
Reis Felipe D.,
Fleury Beatriz G.,
Edwards Howell G. M.,
Oliveira Luiz F. C.
Publication year - 2013
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4226
Subject(s) - raman spectroscopy , conjugated system , chemistry , pigment , botany , photochemistry , stereochemistry , organic chemistry , biology , optics , physics , polymer
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 ν 1 (C=C), 1159 ν 2 (C–C) and 1005 cm −1 ρ 3 (C–CH 3 ) 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.