2023/03/16 by Nina Davtian, Nuria Penalva, Antoni Rosell‐Melé +1 · 1 voice · 2 citations
Earth and Planetary Sciences · Environmental Science · #Marine and coastal ecosystems #Isotope Analysis in Ecology #Geology and Paleoclimatology Research
paper · doi:10.1016/j.chroma.2023.463935
The analysis of trace quantities of monosaccharide anhydrides (MAs) in sediments is complicated by the lack of fast and reliable technologies to selectively extract these water-soluble non-ionic compounds from samples of complex composition. Here we describe a solid phase extraction method that takes advantage of the affinity between monosaccharide anhydrides (MAs) and immobilized Na+ ions related to ligand-exchange processes (LE-SPE). The capacity factor of LE-SPE columns was enhanced by using non-aqueous mobile phases such as DCM/MeOH mixtures. We have used the unique properties of LE-SPE columns to selectively extract MAs from lacustrine, coastal, and deep-sea oceanic sediment samples. The analytical procedure produces extracts with low ion suppression effects (0–20%), resulting in ideal conditions for MAs quantification with LC-ESI-MS/MS systems irrespective of the sedimentary matrix and MAs concentration. The analytical method yields repeatable concentration values (RSD of 9–23% for levoglucosan and 15–34% for mannosan and galactosan) and an IS recovery of 45–70%. The instrumental dynamic range is 10–10000 pg injected, but in practice, the methodological lower limit of quantification is constrained by sample contamination during processing. The combination of LE-SPE and LC-ESI-MS/MS has the potential to produce sensitive and reliable technologies to analyze saccharides and amino acids in environmental and biological samples.