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The detection of relatively low concentrations of the biomarkers in experimentally prepared evaporitic matrices using a portable Raman instrument (Ahura First Defender XL equipped with a 785nm diode laser and fixed frontal probe) under Alpine conditions was tested. The instrument was able to detect nucleobases thymine (1673 and 984cm −1 ) and adenine (722 and 536cm −1 ) at concentrations...
Raman spectra of 13 amino acids: l-alanine, β-alanine, l-asparagine, l-aspartic acid, l-glutamic acid, l-glutamine, glycine, l-methionine, l-proline, l-serine, l-threonine, l-tryptophan and l-tyrosine were acquired outdoors using two portable Raman instruments from the Ahura and Delta Nu manufacturers, both with 785nm laser excitation. Both instruments provide quality Raman spectra with nevertheless...
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