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Published on: October 4, 2012
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Comparative Analysis of Commercial Colloidal Silver Products
1Ames Electronic Materials Division, South Plainfield, NJ 07080, USA.
International Journal of Nanomedicine
|December 30, 2020
Summary
Many colloidal silver supplements contain only ionic silver, not silver nanoparticles as claimed. This misrepresentation by manufacturers impacts consumer understanding of efficacy and safety.
Area of Science:
- Nanotechnology
- Materials Science
- Analytical Chemistry
Background:
- The COVID-19 pandemic spurred demand for supplements with antimicrobial properties.
- Colloidal silver, with known antibacterial and antiviral effects, gained popularity.
- The unregulated supplement industry lacks standards, hindering product quality assessment.
Purpose of the Study:
- To scientifically evaluate commercial colloidal silver products sold online.
- To assess the accuracy of manufacturer claims regarding silver nanoparticle content.
Main Methods:
- Analyzed 14 popular colloidal silver products from Amazon.
- Employed advanced analytical techniques: UV-Vis, Field Emission Scanning Electron Microscopy (FE-SEM), and Atomic Absorption Spectroscopy (AAS).
- Investigated silver nanoparticle size, shape, and dispersion.
Main Results:
- Silver concentrations in products generally matched manufacturer claims.
- UV-Vis, FE-SEM, and STEM analyses indicated the absence of silver nanoparticles in most samples.
- 70% of evaluated products contained only ionic silver, not silver nanoparticles.
Conclusions:
- Significant misrepresentation exists, with many products labeled 'colloidal silver' lacking silver nanoparticles.
- Ionic silver and silver nanoparticles differ substantially in action, efficacy, and safety.
- This study establishes a scientific protocol for characterizing silver supplements and addresses consumer safety concerns.
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