Fast screening of carotenoids of gypsum endoliths using portable Raman spectrometer (Messinian gypsum, Sicily),Journal of Raman Spectroscopy

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Fast screening of carotenoids of gypsum endoliths using portable Raman spectrometer (Messinian gypsum, Sicily)
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-04-27 , DOI: 10.1002/jrs.5891
Kateřina Němečková ₁ , Jan Jehlička ₁ , Adam Culka ₁

Affiliation

We tested the potential of a portable Raman spectrometer—RaPort (G) by EnSpectr with a 532‐nm laser for use in field detection of biomarkers of endolithic colonization in gypsum. This study extends our previous research on gypsum endolithic colonies using laboratory Raman microspectrometer (514.5‐ and 785‐nm lasers). In the current study, variously coloured layers were found and screened separately on the outcrop under natural conditions. In the recorded Raman spectra, stretching vibrations of carotenoids were observed—ν₁ (C═C) around 1,513 cm⁻¹, and ν₂ (C—C) around 1,154 cm⁻¹, as well as the feature at around 1,005 cm⁻¹. The exact identification of different carotenoids by portable Raman spectrometer is limited. Nevertheless, the portable Raman spectrometer allowed fast and in situ detection of carotenoids of variously pigmented gypsum endolithic zones. Application of miniature Raman instruments is important in the context of forthcoming astrobiological missions to Mars (Exomars and Mars 2020).

中文翻译：

使用便携式拉曼光谱仪（西西里岛麦西尼安石膏）快速筛查石膏残渣中的类胡萝卜素

我们用532 nm激光测试了EnSpectr便携式Raman光谱仪RaPort（G）的潜力，用于现场检测石膏内生菌落的生物标记。这项研究使用实验室拉曼光谱仪（514.5和785 nm激光）扩展了我们以前对石膏内石集落的研究。在当前的研究中，发现了各种颜色的层，并在自然条件下分别对露头进行了筛选。在所记录的拉曼光谱中，观察到-ν类胡萝卜素的伸缩振动₁（C = C）周围1513厘米^-1，和ν ₂（C-C）周围1154厘米^-1，以及所述特征在周围1005厘米^{- 1个}。便携式拉曼光谱仪对不同类胡萝卜素的准确识别受到限制。然而，便携式拉曼光谱仪可以快速，原位检测各种色素的石膏内石层区域的类胡萝卜素。在即将对火星进行天体生物学任务时（Exomars和Mars 2020），应用微型拉曼仪器非常重要。

更新日期：2020-04-27

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