Summary of Study ST002292
This data is available at the NIH Common Fund's National Metabolomics Data Repository (NMDR) website, the Metabolomics Workbench, https://www.metabolomicsworkbench.org, where it has been assigned Project ID PR001470. The data can be accessed directly via it's Project DOI: 10.21228/M8Q99X This work is supported by NIH grant, U2C- DK119886.
See: https://www.metabolomicsworkbench.org/about/howtocite.php
This study contains a large results data set and is not available in the mwTab file. It is only available for download via FTP as data file(s) here.
| Study ID | ST002292 |
| Study Title | Quantification of Dissolved Metabolites in Environmental Samples through Cation-Exchange Solid Phase Extraction (CX-SPE) paired with Liquid Chromatography-Mass Spectrometry |
| Study Type | Method Development for Dissolved Metabolomics in Seawater |
| Study Summary | Small, biologically produced, organic molecules called metabolites play key roles in microbial systems where they directly mediate exchanges of nutrients, energy, and information. However, the study of dissolved polar metabolites in seawater and other environmental matrices has been hampered by analytical challenges including high inorganic ion concentrations, low analyte concentrations, and high chemical diversity. Here we show that a cation-exchange solid phase extraction (CX-SPE) sample preparation approach separates positively charged and zwitterionic metabolites from seawater and freshwater samples, allowing their analysis by liquid chromatography-mass spectrometry (LC-MS). We successfully extracted 69 known compounds from an in-house compound collection and evaluated the performance of the method by establishing extraction efficiencies and limits of detection (pM to low nM range) for these compounds. CX-SPE extracted a range of compounds including amino acids and compatible solutes, resulted in very low matrix effects, and performed robustly across large variations in salinity and dissolved organic matter (DOM) concentration. We compared CX-SPE to an established solid phase extraction procedure (PPL-SPE) and demonstrate that these two methods extract fundamentally different fractions of the dissolved metabolite pool with CX-SPE extracting compounds that are on average smaller and more polar. We use CX-SPE to analyze four environmental samples from distinct aquatic biomes, producing some of the first CX-SPE dissolved metabolomes. Quantified compounds ranged in concentration from 0.0093 nM to 49 nM and were composed primarily of amino acids (0.15 – 16 nM) and compatible solutes such as TMAO (0.89 – 49 nM) and glycine betaine (2.8 – 5.2 nM). |
| Institute | University of Washington |
| Department | Oceanography |
| Laboratory | Ingalls Lab |
| Last Name | Sacks |
| First Name | Joshua |
| Address | Ocean Sciences Building, 1492 NE Boat St. Seattle, WA 98105 |
| jssacks@uw.edu | |
| Phone | 4074090052 |
| Submit Date | 2022-08-30 |
| Raw Data Available | Yes |
| Raw Data File Type(s) | mzML |
| Analysis Type Detail | LC-MS |
| Release Date | 2022-10-19 |
| Release Version | 1 |
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Subject:
| Subject ID: | SU002378 |
| Subject Type: | Water sample |
