Record details

Title
    Raman spectroscopic identification of usnic acid in hydrothermal minerals as a potential Martian analogue
Author
    Jehlička, Jan
    Osterrothová, Kateřina
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy
Vol./nr.
    Roč. 73, č. 3
Pages
    5
Year
    2009
Thesaurus term
    identification
    Martian analogue
    Raman spectroscopy
    usnic acid
Keyword
    Acid
    Analogue
    Hydrothermal
    Identification
    Martian
    Minerals
    Potential
    Raman
    Spectroscopic
    Usnic
Abstract (in english)
   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 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.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    8. 8. 2012