Abstract
Nowadays, analytical systems based on silver triangular nanoplates (AgTNPs) have been shown as good prospects for chemical sensing. However, they still remain relatively poorly studied as colorimetric probes for sensing various classes of compounds. This study shows that these nanoparticles are capable of being oxidized by peroxides, including both hydrogen peroxide and its organic derivatives. The oxidation was found to result in a decrease in the AgTNPs’ local surface plasmon resonance band intensity at 620 nm. This was proposed for peroxide-sensitive spectrophotometric determination. Five peroxides differing in their structure and number of functional groups were tested. Three of them easily oxidized AgTNPs. The effects of a structure of analytes and main exterior factors on the oxidation are discussed. The detection limits of peroxides in the selected conditions increased in the series peracetic acid < hydrogen peroxide < tert-butyl hydroperoxide, coming to 0.08, 1.6 and 24 μmol L−1, respectively. tert-Butyl peroxybenzoate and di-tert-butyl peroxide were found to have no effect on the spectral characteristics of AgTNPs. By the example of hydrogen peroxide, it was found that the determination does not interfere with 100–4000-fold quantities of common inorganic ions. The proposed approach was successfully applied to the analysis of drugs, cosmetics and model mixtures.
Highlights
It is well known that hydrogen peroxide and the associated active forms of oxygen play an important role in biochemistry, medicine and environmental monitoring [1–4]
The interaction is able to change the state of AgTNPs solution and, can affect both local surface plasmon resonance (LSPR)
Above-mentioned interaction is able to change the state of AgTNPs in solution and, and SERS effects on the surface of nanoparticles [37]
Summary
It is well known that hydrogen peroxide and the associated active forms of oxygen (anion radicals, hydroxyl radicals, etc.) play an important role in biochemistry, medicine and environmental monitoring [1–4]. Their excess relative to normal values may indicate the presence of an inflammatory process in the human body, deactivation of mitochondrial biochemical cycles and other important problems [5,6]. The attention of most researchers is mainly focused on the enzymatic methods, which have both good sensitivity and good selectivity [7,8]. Being substances of a protein nature, they are extremely sensitive to environmental parameters, such as temperature, pH and ionic strength, which requires the strictly controlled conditions and greatly complicates the procedure of analysis. To the best of our knowledge, Sensors 2020, 20, 4832; doi:10.3390/s20174832 www.mdpi.com/journal/sensors
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