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- W1818523863 abstract "Carotenoids are among the key biomarkers in the search for life on other planets, and non‐destructive Raman spectroscopy on future rover missions is a potential sensitive detection method, especially under resonant conditions. In this research, reflectance spectra of minerals and microorganisms were measured using ultraviolet/visible diffuse reflectance spectroscopy in order to evaluate potential resonance Raman conditions and the possible degree of sample damage during laser irradiation. We report a photodegradation and semi‐quantitative Raman study of β‐carotene and the carotenoid‐containing extremophile Deinococcus radiodurans mixed with calcite at excitation wavelengths of 440 nm, 532 nm and 785 nm. A different type of carotenoid was detected in a culture of Chroococcidiopsis . Carotenoids embedded in bacterial membranes were found to be less sensitive to photodegradation than in a mineral matrix. Corrections for self‐absorption effects were performed using the 1085 cm −1 peak of calcite as an internal standard. Carotenoid‐type signals from 1 mg g −1 D . radiodurans in calcite could be detected, corresponding to about 5 µg g −1 β‐carotene in calcite (≈0.5% cell weight). This research emphasizes the potential suitability of Raman spectroscopy in the detection of organic biomarkers in future planetary exploration. Copyright © 2015 John Wiley & Sons, Ltd." @default.
- W1818523863 created "2016-06-24" @default.
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- W1818523863 date "2015-01-15" @default.
- W1818523863 modified "2023-09-26" @default.
- W1818523863 title "Raman spectroscopy for future planetary exploration: photodegradation, self-absorption and quantification of carotenoids in microorganisms and mineral matrices" @default.
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- W1818523863 doi "https://doi.org/10.1002/jrs.4647" @default.
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