Raman spectroscopic identification of usnic acid in hydrothermal minerals as a potential Martian analogue

被引：14

作者：

Osterrothova, Katerina ^{[1
]}

Jehlicka, Jan ^{[1
]}

机构：

[1] Charles Univ Prague, Inst Geochem Mineral & Mineral Resources, Fac Sci, Prague 12843 2, Czech Republic

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2009年 / 73卷 / 03期

关键词：

Raman spectroscopy; Usnic acid; Mars-analogue; Lichen; Hydrothermal minerals; LICHEN SYMBIOSIS; MARS; CARBONATE;

D O I：

10.1016/j.saa.2008.09.005

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Raman spectroscopy using 785 nm excitation was tested as a nondestructive method for determining the presence of the potential biomarker, usnic acid, in experimentally prepared mineral matrices. Investigated samples consisting of usnic acid mixed with powdered hydrothermal minerals, gypsum and calcite were studied. Various concentrations of usnic acid in the mineral matrix were studied to determine the detection limits of this biomarker. Usnic acid was mixed with gypsum (respectively, calcite) and covered by a UV-transparent crystal of gypsum (CaSO(4)center dot 2H(2)O), thereby creating artificial inclusions similar to those which could be present in Martian minerals. A Raman usnic acid signal at the concentration level as low as 1 g kg(-1) was obtained in the powdered mineral matrix and 5 g kg(-1) when analyzed through the monocrystal. The number of registered usnic acid key Raman bands was dependent on the particular mineral matrix. If a similar concentration of usnic acid could persist in Martian samples, then Raman spectroscopy will be able to identify it. Obtained results will aid both in situ Raman analyses on Mars and on Earth. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：576 / 580

页数：5

共 20 条

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