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Chemical Functionalities at the Silica Surface Determining its Reactivity when Inhaled. Formation and Reactivity of Surface Radicals

Fubini, Bice, Giamello, Elio, Volante, Marco, Bolis, Vera·1990·Toxicology and Industrial Health
DOI 10.1177/074823379000600604
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Abstract

Reactive radicals at the surface of quartz or other SiO2 poly- morphs have been studied by EPR in relation to their possible role in pathogenicity. All the examined dusts bear the character- istic radicals of silica ground in air: Si, SiO, SiO2 (peroxyradi- cal) and O2 (superoxide ion), but some also show additional spectral lines belonging to other radical forms. Comparison of standard quartz dusts (DQ-12, Min-u-sil 5) with a natural quartz and with what obtained by grinding a very pure quartz crystal indicates that to a higher purity corresponds a higher rad- ical population. Cristobalite and vitreous silica exhibit similar spectra, with larger proportion by respect to quartz, of partially reduced oxygen forms. The reactivity of the silica surface to- wards O2 and NaClO aqueous solutions are investigated by ex- amining the modification in the EPR spectra induced by these treatments. A possible mechanism for fibrogenicity is proposed whereby, within the activated macrophage, a catalytic reaction occurs between surface functionalities and macrophage oxygen metabolites. This reaction would trigger the abnormal produc- tion of fibroblast stimulating factors, ending up with silicosis.

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Metadata

Authors
Fubini, B., Giamello, E., Volante, M., & Bolis, V.
Affiliations
Dipartimento di Chimica Inorganica, Chimica Fisica e Chimica dei Materiali, Via Pietro Giuria 9, 10125 Torino-Italy
Venue
Toxicology and Industrial Health
Publisher
SAGE Publications
Published
1990-12
Volume
6
Issue
6
Pages
571-598
ISSN
  • 0748-2337
  • 1477-0393
DOI
10.1177/074823379000600604
Cited by
8
References
1
Language
en
Licence
journals.sagepub.com/page/policies/text-and-data-mining-license (tdm)

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CoChat. (2026). Citation check: Chemical Functionalities at the Silica Surface Determining its Reactivity when Inhaled. Formation and Reactivity of Surface Radicals. https://app.cochat.ai/papers/10.1177/074823379000600604
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Fubini, B., Giamello, E., Volante, M., & Bolis, V. (1990). Chemical Functionalities at the Silica Surface Determining its Reactivity when Inhaled. Formation and Reactivity of Surface Radicals. Toxicology and Industrial Health. https://doi.org/10.1177/074823379000600604