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Published on: January 22, 2020
Membranolytic activities of quartz standards
R P Nolan1, A M Langer, R A Eskenazi
1Center for Polypeptide and Membrane Research, The Mount Sinai School of Medicine, 1 Gustave L. Levy Place, New York, NY 10029, USA.
Summary
Quartz's membranolytic activity, crucial for understanding pneumoconiosis, varies significantly with particle size and preparation methods. Smaller quartz particles and specific treatments restore biological potential, impacting fibrogenic dust research.
Area of Science:
- Mineralogy
- Toxicology
- Materials Science
Background:
- Quartz is a common mineral with potential biological effects.
- Standard fibrogenic dusts used in research vary in their properties.
- Understanding quartz's biological activity is essential for occupational health.
Purpose of the Study:
- To quantitatively assess the membranolytic activity of various quartz specimens.
- To investigate how factors like particle size, preparation, and thermal treatment influence quartz activity.
- To determine the variability in biological potential among different quartz samples.
Main Methods:
- Membranolytic activity was measured by erythrocyte lysis percentage.
- Quartz specimens were tested as heterogeneous powders and size-fractionated bands.
- Particle size reduction methods and thermal treatments were applied.
- Characterization included electron microscopy, X-ray diffraction, and optical microscopy.
Main Results:
- Membranolytic activity varied up to 100-fold across different quartz specimens and conditions.
- Activity increased significantly (average 30-fold) as particle size decreased from 20 to 1 µm.
- Hydration during processing reduced activity, which was restored by heating to 400-500°C.
- Physico-chemical properties influencing biological potential were not discernible by standard microscopy or diffraction.
Conclusions:
- Quartz's membranolytic activity is highly dependent on physical and chemical treatments.
- Particle size is a critical determinant of quartz's biological potential.
- Variability in quartz properties necessitates careful consideration in fibrogenic dust research and risk assessment.
