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Reactivity of Cyanobacteria Metabolites with Ozone: Multicompound Competition Kinetics.

ABSTRACT: Cyanobacterial blooms occur at increasing frequency and intensity, notably in freshwater. This leads to the introduction of complex mixtures of their products, i.e., cyano-metabolites, to drinking water treatment plants. To assess the fate of cyano-metabolite mixtures during ozonation, a novel multicompound ozone (O₃) competition kinetics method was developed. Sixteen competitors with known second-order rate constants for their reaction with O₃ ranging between 1 and 10⁸ M^-1 s^-1 were applied to cover a wide range of the O₃ reactivity. The apparent second-order rate constants (k_app,O3) at pH 7 were simultaneously determined for 31 cyano-metabolites. k_app,O3 for olefin- and phenol-containing cyano-metabolites were consistent with their expected reactivity (0.4-1.7 × 10⁶ M^-1 s^-1) while k_app,O3 for tryptophan- and thioether-containing cyano-metabolites were significantly higher than expected (3.4-7.3 × 10⁷ M^-1 s^-1). Cyano-metabolites containing these moieties are predicted to be well abated during ozonation. For cyano-metabolites containing heterocycles, k_app,O3 varied from <10² to 5.0 × 10³ M^-1 s^-1, giving first insights into the O₃ reactivity of this class of compounds. Due to lower O₃ reactivities, heterocycle- and aliphatic amine-containing cyano-metabolites may be only partially degraded by a direct O₃ reaction near circumneutral pH. Hydroxyl radicals, which are formed during ozonation, may be more important for their abatement. This novel multicompound kinetic method allows a high-throughput screening of ozonation kinetics.

SUBMITTER: Rouge V

PROVIDER: S-EPMC11223487 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature

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Reactivity of Cyanobacteria Metabolites with Ozone: Multicompound Competition Kinetics.

Rougé Valentin V von Gunten Urs U Janssen Elisabeth M L EML

Environmental science & technology 20240617 26

Cyanobacterial blooms occur at increasing frequency and intensity, notably in freshwater. This leads to the introduction of complex mixtures of their products, i.e., cyano-metabolites, to drinking water treatment plants. To assess the fate of cyano-metabolite mixtures during ozonation, a novel multicompound ozone (O3) competition kinetics method was developed. Sixteen competitors with known second-order rate constants for their reaction with O3 ranging between 1 and 10 ...[more]

PMID: 38885118

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Project description:RationaleAir pollution has been associated with increased prevalence of type 2 diabetes; however, the mechanisms remain unknown. We have shown that acute ozone exposure in rats induces release of stress hormones, hyperglycemia, leptinemia, and glucose intolerance that are associated with global changes in peripheral glucose, lipid, and amino acid metabolism.ObjectivesTo examine ozone-induced metabolic derangement in humans using serum metabolomic assessment, establish human-to-rodent coherence, and identify novel nonprotein biomarkers.MethodsSerum samples were obtained from a crossover clinical study that included two clinic visits (n = 24 each) where each subject was blindly exposed in the morning to either filtered air or 0.3 parts per million ozone for 2 hours during 15-minute on-off exercise. Serum samples collected within 1 hour after exposure were assessed for changes in metabolites using a metabolomic approach.Measurements and main resultsMetabolomic analysis revealed that ozone exposure markedly increased serum cortisol and corticosterone together with increases in monoacylglycerol, glycerol, and medium- and long-chain free fatty acids, reflective of lipid mobilization and catabolism. Additionally, ozone exposure increased serum lysolipids, potentially originating from membrane lipid breakdown. Ozone exposure also increased circulating mitochondrial β-oxidation-derived metabolites, such as acylcarnitines, together with increases in the ketone body 3-hydroxybutyrate. These changes suggested saturation of β-oxidation by ozone in exercising humans.ConclusionsAs in rodents, acute ozone exposure increased stress hormones and globally altered peripheral lipid metabolism in humans, likely through activation of a neurohormonally mediated stress response pathway. The metabolomic assessment revealed new biomarkers and allowed for establishment of rodent-to-human coherence. Clinical trial registered with www.clinicaltrials.gov (NCT 01492517).

Dataset Information

Reactivity of Cyanobacteria Metabolites with Ozone: Multicompound Competition Kinetics.

Publications

Reactivity of Cyanobacteria Metabolites with Ozone: Multicompound Competition Kinetics.

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