Isotopic Analysis of Microbial Dehalogenation Mechanisms
Summary
Microbial dehalogenation underpins the natural attenuation and engineered remediation of halogenated pollutants such as chlorinated solvents and polychlorinated biphenyls. Compound-specific isotope analysis (CSIA) has emerged as a powerful approach to characterise in situ reaction pathways, quantify transformation extents and distinguish biotic from abiotic processes. By measuring subtle shifts in stable carbon, hydrogen and halogen isotope ratios of substrates and products, researchers can infer enzymatic mechanisms, identify rate-limiting steps and monitor field-scale dehalogenation without relying solely on concentration data. Integration of isotopic data with molecular studies of reductive and hydrolytic dehalogenases has enabled detailed insights into electron-transfer dynamics, substrate specificity and environmental factors that influence bioremediation efficiency. Global applications span groundwater cleanup, contaminated sediment management and evaluation of sewage-sludge treatment, emphasising isotopic analysis as a critical tool for robust assessment of microbial dehalogenation in diverse ecological contexts.
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Isotopic Analysis of Microbial Dehalogenation Mechanisms publication trend
The graph below shows the total number of articles in isotopic analysis of microbial dehalogenation mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
Compound-specific isotope analysis (CSIA): Analytical technique measuring stable isotope ratios of individual compounds to infer reaction pathways and transformation extents.
Stable isotope fractionation: Preferential partitioning of lighter or heavier isotopes during chemical reactions, yielding diagnostic changes in isotopic ratios.
Reductive dehalogenase (RDase): Corrinoid-containing enzyme that catalyses the removal of halogen atoms from organic compounds under anaerobic conditions.
Hydrolytic dehalogenase: Enzyme that cleaves carbon–halogen bonds via nucleophilic substitution, typically yielding a halide ion and an alcohol.
Isotopic signature: Distinctive pattern of isotope ratios in substrates and products that reflects specific reaction mechanisms.
References
- Lack of selectivity in sample preparation ‒ An achilles heel of compound-specific isotope analysis for environmental micropollutants. TrAC Trends in Analytical Chemistry (2024).
- Organohalide Respiring Bacteria and Reductive Dehalogenases: Key Tools in Organohalide Bioremediation. Frontiers in Microbiology (2016).
- Dehalogenases: From Improved Performance to Potential Microbial Dehalogenation Applications. Molecules (2018).
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