Abstract
The collinear dual beam thermal lens spectrometric (TLS) detection in batch mode (BM), as well as combined with the flow injection analysis (FIA), was applied to determine the colloidal silver in personal care products available in the public pharmacies and declared by producers to contain nanosilver at the level of 5-30 μg ml-1. It was found, that the examined samples contain mainly ionic silver (99% or more), whereas the colloidal form of silver is at the level of less than 1 μg ml-1. The TLS methods were confirmed to be fast, precise, highly accurate and highly sensitive with limits of quantitation of 0.30 ng ml-1 and 1.50 ng ml-1 and relative standard deviations not higher than 1.2% and 6.0% for BM- and FIA-TLS configuration, respectively. The developed TLS methods have nearly 60 times lower LOQ values concerning the colloidal silver determination than the classical spectrophotometric method. To verify the obtained results of the real sample analysis the total amount of ionic silver was determined by the use of ICP-OES technique.
Highlights
Inorganic nanoparticles exhibit physical, chemical and biological properties which attract much interest in a broad spectrum of applications including the field of pharmaceutics and personal care products
The thermal lens spectrometry, both in batch mode (BM) and in flow injection analysis (FIA) working configurations, was applied for determination of the content of colloid and total silver in the samples, the later one as the sum of the initially present colloidal silver and the colloidal silver obtained from the same samples from the ionic silver, which was present initially into the samples as well, after its reduction to elementary one
A good agreement of the results was obtained for colloidal silver as well as for total silver measured in the form of AgNPs by both thermal lens spectrometric (TLS) and spectrophotometric methods for all real samples, since the statistical analysis of these results reveals, that the data obtained by all three measurement techniques and protocols are in agreementat at the confidence level (CL) of 99%
Summary
Chemical and biological properties which attract much interest in a broad spectrum of applications including the field of pharmaceutics and personal care products. Nowadays the increased antibiotic resistance of disease-causing microbes has lead to the renewed interest in silver and its compounds as biocidal agents. They serve as antibacterial components in dental resin composites [8,9], in coatings of medical devices [10,11,12], surgical prostheses [13], wound dressings [14,15], and in novel advanced biocomposite materials for medical use [16]. Silver nanoparticles are incorporated in some products such as the deodorizing shoe inserts, sports socks, soaps, lotions, nasal sprays and in household appliances such as washing machines, air conditioners and other technical products
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