title: Chemical images of marine bio-active compounds by surface enhanced Raman spectroscopy and transposed orthogonal partial least squares (T-OPLS).
abstract: Surface enhanced Raman spectroscopy combined with transposed Orthogonal Partial Least Squares (T-OPLS) was shown to produce chemical images of the natural antibacterial surface-active compound 1,1,3,3-tetrabromo-2-heptanone (TBH) on Bonnemaisonia hamifera. The use of gold colloids functionalised with the internal standard 4-mercapto-benzonitrile (MBN) made it possible to create images of the relative concentration of TBH over the surfaces. A gradient of TBH could be mapped over and in the close vicinity of the B. hamifera algal vesicles at the attomol/pixel level. T-OPLS produced a measure of the spectral correlation for each pixel of the hyperspectral images whilst not including spectral variation that was linearly independent of the target spectrum. In this paper we show the possibility to retrieve specific spectral information with a low magnitude in a complex matrix.
authors: Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden.
authors: Aamer
authors: A
authors: Abbas
authors: Mats
authors: M
authors: Josefson
authors: Göran M
authors: GM
authors: Nylund
authors: Henrik
authors: H
authors: Pavia
authors: Katarina
authors: K
authors: Abrahamsson
mesh_terms: D017979:Gold Colloid / Q000737:chemistry; D007659:Ketones / Q000032:analysis*; D016018:Least-Squares Analysis; D057054:Molecular Imaging / Q000379:methods*; D015999:Multivariate Analysis; D000461:Rhodophyta / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*
chemical_list: C561883:1,1,3,3-tetrabromo-2-heptanone; D017979:Gold Colloid; D007659:Ketones