Huang, YY and Beal, CM and Cai, WW and Ruoff, RS and Terentjev, EM (2010) Micro-Raman spectroscopy of algae: composition analysis and fluorescence background behavior. Biotechnol Bioeng, 105. pp. 889-898.Full text not available from this repository.
Preliminary feasibility studies were performed using Stokes Raman scattering for compositional analysis of algae. Two algal species, Chlorella sorokiniana (UTEX #1230) and Neochloris oleoabundans (UTEX #1185), were chosen for this study. Both species were considered to be candidates for biofuel production. Raman signals due to storage lipids (specifically triglycerides) were clearly identified in the nitrogen-starved C. sorokiniana and N. oleoabundans, but not in their healthy counterparts. On the other hand, signals resulting from the carotenoids were found to be present in all of the samples. Composition mapping was conducted in which Raman spectra were acquired from a dense sequence of locations over a small region of interest. The spectra obtained for the mapping images were filtered for the wavelengths of characteristic peaks that correspond to components of interest (i.e., triglyceride or carotenoid). The locations of the components of interest could be identified by the high intensity areas in the composition maps. Finally, the time evolution of fluorescence background was observed while acquiring Raman signals from the algae. The time dependence of fluorescence background is characterized by a general power law decay interrupted by sudden high intensity fluorescence events. The decreasing trend is likely a result of photo-bleaching of cell pigments due to prolonged intense laser exposure, while the sudden high intensity fluorescence events are not understood.
|Uncontrolled Keywords:||Chlorella Chlorophyta Eukaryota Fluorescence Spectrum Analysis, Raman|
|Depositing User:||Cron Job|
|Date Deposited:||12 Aug 2013 08:11|
|Last Modified:||30 Dec 2013 01:24|
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