Related Experiment Video
Updated: Sep 30, 2025
Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
Published on: January 7, 2019
Extraction methods for untargeted metabolomics influence enzymatic activity in diverse soils
Madison A Bell1, Ulrica McKim2, Amanda Sproule2
1Agriculture and Agri-food Canada, Ottawa Research and Development Centre, Ottawa, ON K1A 0C6, Canada; Laboratory for the Analysis of Natural and Synthetic Environmental Toxicants, Department of Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada.
Estimating soil organic matter (SOM) loss during untargeted metabolomics is crucial. Shaking extraction minimizes SOM loss and compositional variation, making it ideal for soil analysis.
Area of Science:
- Environmental Science
- Soil Science
- Analytical Chemistry
Background:
- Soil organic matter (SOM) is a vital terrestrial carbon pool, essential for soil health and productivity.
- Accurate chemical characterization of SOM aids understanding of stabilization processes.
- Untargeted metabolomics offers insights into SOM's low molecular weight features.
Purpose of the Study:
- To quantify soil organic matter (SOM) loss during extraction for untargeted metabolomics.
- To evaluate the impact of extraction methods and solvents on SOM recovery and composition.
- To assess the influence of soil/clay type on SOM extraction efficiency.
Main Methods:
- Utilized two mined clays (kaolinite, montmorillonite) and three diverse soils.
- Assessed extraction efficiency using three enzymatic activity indicators (DCIP, MUBph, LDOPA).
- Compared extraction methods (ultrasonication, shaking, chloroform fumigation) with water and methanol solvents.
Main Results:
- Soil/clay type significantly affected indicator recovery and SOM recovery.
- Extraction method choice impacted SOM mass feature composition and recovery.
- Chloroform fumigation led to the greatest indicator loss, attributed to enzymatic activity or adsorption.
- Shaking extraction showed minimal variation in SOM composition and loss across tested soils.
Conclusions:
- Recommends shaking as the preferred method for untargeted SOM extraction due to minimal loss and variation.
- Highlights the importance of considering extraction method and solvent choice for accurate SOM analysis.
- Emphasizes the influence of soil physical properties on extraction efficiency.
