Electron spin resonance. Part two: a diagnostic method in the environmental sciences

Our plain-English summary of Electron spin resonance. Part two: a diagnostic method in the environmental sciences, by C.J. Rhodes (Science Progress, 2011).

The study

• Author: C.J. Rhodes
• Journal: Science Progress
• Published: 2011;94(Pt 4):339-413
• Type of article: Review
• Cited by: 8 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text

Abstract

A review is presented of some of the ways in which electron spin resonance (ESR) spectroscopy may be useful to investigate systems of relevance to the environmental sciences. Specifically considered are: quantititave ESR, photocatalysis for pollution control; sorption and mobility of molecules in zeolites; free radicals produced by mechanical action and by shock waves from explosives; measurement of peroxyl radicals and nitrate radicals in air; determination of particulate matter polyaromatic hydrocarbons (PAH), soot and black carbon in air; estimation of nitrate and nitrite in vegetables and fruit; lipid-peroxidation by solid particles (silica, asbestos, coal dust); ESR of soils and other biogenic substances: formation of soil organic matter carbon capture and sequestration (CCS) and no-till farming; detection of reactive oxygen species in the photosynthetic apparatus of higher plants under light stress; molecular mobility and intracellular glasses in seeds and pollen; molecular mobility in dry cotton; characterisation of the surface of carbon black used for chromatography; ESR dating for archaeology and determining seawater levels; measurement of the quality of tea-leaves by ESR; green-catalysts and catalytic media; studies of petroleum (crude oil); fuels; methane hydrate; fuel cells; photovoltaics; source rocks; kerogen; carbonaceous chondrites to find an ESR-based marker for extraterrestrial origin; samples from the Moon taken on the Apollo 11 and Apollo 12 missions to understand space-weathering; ESR studies of organic matter in regard to oil and gas formation in the North Sea; solvation by ionic liquids as green solvents, ESR in food and nutraceutical research.

In plain English

This article was a review by a single author. It covered many ways electron spin resonance (ESR), a laboratory method that detects free radicals, had been used in the environmental sciences, from air pollution and soils to fuels and Moon samples. On asbestos, it described earlier studies rather than a new experiment. One short section described earlier studies of lipid peroxidation by silica, asbestos and coal dust. The author noted that the precise way inhaled asbestos causes lung disease remained uncertain. The studies described there reported several things. Crocidolite's activity seemed to depend on the valency, location and availability of its iron rather than its total iron content. 'Detoxified' or microwave-treated crocidolite showed reduced radical-producing or lipid-peroxidising activity. In rats given 500 micrograms of crocidolite into the windpipe, lung extracts gave radical signals that were taken as evidence of lipid peroxidation in the living animal. Another study compared how probe molecules attached to chrysotile, anthophyllite, amosite and crocidolite. The author wrote that spin-trapping studies gave evidence that these materials can start free radical formation and so might lead to lipid peroxidation of lung cell membranes.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Narrative review of published studies using ESR in the environmental sciences; asbestos is covered in one short section on lipid peroxidation by solid particles
• Who was studied: No asbestos study population of its own; the asbestos section draws on previously published fiber experiments and one study in rats
• Exposure: In the reviewed asbestos studies: crocidolite fibres (native, 'detoxified' and microwave-treated), and chrysotile, anthophyllite, amosite and crocidolite in a probe-adsorption study; silica (quartz) and coal dust were also covered
• Main results:
  • Reviewed study: the activity of crocidolite in iron-catalysed reactions was not characterised by its total iron content but appeared to depend on the valency, location and availability of the iron
  • Reviewed study: 'detoxified' crocidolite (coated using ferric salts) gave a weaker hydroxyl-radical spin-adduct signal than native crocidolite fibres
  • Reviewed study: microwave treatment of crocidolite fibres decreased their ability to peroxidise linoleic acid
  • Reviewed rat study: 24 hours after crocidolite instillation, lung extracts showed a carbon-centred radical adduct spectrum, with a far weaker spectrum in saline-instilled lungs, described as evidence of in vivo lipid peroxidation
  • Reviewed study: the hydroxyl-radical-generating potential of coal dust correlated positively with its surface iron content
• The authors' conclusion: The author wrote that spin-trapping studies give evidence that silica, asbestos and coal dust can initiate free radical formation and so might precipitate lipid peroxidation of lung cell membranes
• Limitations the authors state:
  • The author stated that the precise mode of action by which inhaled minerals such as asbestos cause lung disease remains uncertain

Topics

Medical terms in this study, explained in our Lexicon: Zeolite, Reactive Oxygen Species (ROS).

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