Biological durability and oxidative potential of a stonewool mineral fibre compared to crocidolite asbestos fibres

Our plain-English summary of Biological durability and oxidative potential of a stonewool mineral fibre compared to crocidolite asbestos fibres, by S. Hippeli, K. Dornisch, S. Kaiser, et al (Archives of Toxicology, 1997).

The study

• Authors: S. Hippeli, K. Dornisch, S. Kaiser, U. Dräger, E.F. Elstner
• Journal: Archives of Toxicology
• Published: 1997;71(8):532-5
• Cited by: 3 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

Experiments are described concerning the differences in redox properties and biodurability of natural asbestos fibres and an experimental stonewool fibre incubated in Gamble solution and reconstructed surfactant fluid. Crocidolite exhibits a significantly higher oxidative potential compared to the tested stonewool fibres. The oxidative activity of both types of fibres is not constant during incubation over several weeks, but rather shows a sinoidal curve including reactivities much higher than those at the beginning of the incubation. A continuous loss of mass is concluded not to be definitively connected with a continuous loss of toxicity.

In plain English

This short communication reported a laboratory experiment, with no people or animals, comparing crocidolite asbestos with an experimental stonewool fibre (stonewool no.13). Fibres were incubated for 7 weeks in Gamble solution, representing blood plasma without proteins, and for 16 weeks in a surfactant-like solution containing phospholipids, each at pH 5.5 and 7.4. Weekly, the authors measured oxidative potential, the fibres' ability to help form reactive oxygen species, in a chemical test system. Crocidolite showed significantly higher activity than the stonewool in both fluids. For both fibres, activity rose and fell over the weeks rather than staying constant, at times reaching levels much higher than at the start. Crocidolite stayed highly active, while stonewool activity disappeared in the surfactant-like solution by the end. Activity was generally lower in the surfactant-like solution. Crocidolite was much more active at pH 5.5 than at 7.4; the stonewool was unaffected by pH. Activity values were shown only as a figure, with the findings described in words. The authors concluded that measuring oxidative potential continuously is needed to evaluate fibres' toxic potential during dissolution.

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: Laboratory (cell-free, in vitro) experiment published as a short communication; fibres were incubated in simulated body fluids and their oxidative potential was measured over time
• Who was studied: No human or animal subjects. Two fibre materials were tested: crocidolite obtained from the National Institute of Standards and Technology (USA), and an experimental stonewool man-made vitreous fibre (stonewool no.13) supplied by Deutsche Rockwool Mineralwoll GmbH. The work was done at the Technische Universität München-Weihenstephan, Germany.
• Exposure: Crocidolite and stonewool fibres (4 mg/ml) were incubated at 37 °C in Gamble solution (representing blood plasma without proteins) for 7 weeks and in a surfactant-like solution for 16 weeks, each at pH 5.5 and 7.4. Samples were taken weekly, and oxidative potential was measured as ethylene release from KMB in an NADH/diaphorase/EDTA system.
• Main results:
  • Crocidolite showed significantly higher oxidative activity than the experimental stonewool, both in Gamble solution and in the surfactant-like solution (no numerical values given in the text)
  • For both fibre types, oxidative potential was not constant over the weeks of incubation. It followed a rising-and-falling (sinusoidal) curve, with reactivities at times much higher than at the start.
  • Crocidolite retained high activity in both media, whereas the oxidative potential of the stonewool disappeared in the surfactant-like solution by the end of incubation
  • Reactivities were generally lower in the surfactant-like solution. The authors suggested that its phospholipids may partly act as radical scavengers.
  • The stonewool's oxidative potential was unaffected by pH, while crocidolite's was much higher at pH 5.5 than at pH 7.4 in both media
• The authors' conclusion: The authors concluded that measuring fibre number, length distribution and ion mass loss only at the beginning and end of incubation is insufficient to determine biodurability, and that continuous measurement of oxidative potential is needed to evaluate the real toxic potential during dissolution. Their abstract states that a continuous loss of mass is not definitively connected with a continuous loss of toxicity.

Topics

The National Library of Medicine indexes this study under subjects our site covers: Crocidolite.

Medical terms in this study, explained in our Lexicon: Crocidolite.

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