Isolation and desalting with cation-exchange chromatography for compound-specific nitrogen isotope analysis of amino acids: application to biogeochemical samples

Rapid Communications in Mass Spectrometry : RCM
Yoshinori TakanoNaohiko Ohkouchi

Abstract

We have established a procedure for removing interfering materials from extracts of geological and biological samples, in order to determine precise compound-specific nitrogen isotopic compositions of amino acids. We employed cation-exchange chromatography of protein and non-protein amino acids prior to derivatization for gas chromatographic separation. The average recovery of a standard amino acid solution was better than 94%, without nitrogen isotope fractionation during the cation-exchange chromatography. We applied the procedure to various environmental samples including 'hard' (calcareous, siliceous, rock and sediment samples) and 'soft' materials (aggregated microbial samples and biological soft tissue samples). We conclude that cation-exchange chromatography is a pre-treatment procedure which should be widely useful for the determination of compound-specific nitrogen isotopic compositions of amino acids.

References

Jul 13, 2000·Protein Science : a Publication of the Protein Society·M V KattiV S Gupta
Sep 11, 2009·International Journal of Molecular Sciences·Marie-Paule BassezNaohiko Ohkouchi
May 7, 2005·Physical Chemistry Chemical Physics : PCCP·C CrépinJ P Boilot

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Citations

Aug 2, 2016·Journal of Mass Spectrometry : JMS·Mauro PaoliniFederica Camin
Sep 17, 2016·Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences·Zhongyi ZhangHuayun Xiao
Feb 9, 2017·Rapid Communications in Mass Spectrometry : RCM·Christopher T Yarnes, Julian Herszage
Sep 29, 2019·Nature Communications·Yasuhiro ObaAkira Kouchi
Jan 17, 2020·Nature·Hiroyuki ImachiKen Takai
Nov 18, 2020·Rapid Communications in Mass Spectrometry : RCM·Alexandra A PhillipsAlex L Sessions

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