Whey peptide-encapsulated silver nanoparticles as a colorimetric and spectrophotometric probe for palladium(II)
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Silver nanoparticles (AgNPs) coated with whey peptides are shown to be a useful optical nanoprobe for the highly sensitive determination of Pd(II). The peptidic surface of the AgNPs works as a molecular receptor for the rapid detection of Pd(II) via a color change from dark yellow to orange/red along with a spectral red-shift with a gap about 120 nm. The effect is caused by the formation of a coordination complex between Pd(II) and the peptide ligands. This results in the aggregation of AgNPs and an absorbance spectral shift from 410 to 530 nm. The absorbance response is linear in the range 0.1 to 1.3 μM Pd(II) with a low detection limit of 115 nM. The nanoprobe responds within a few minutes and is not interfered by other metal ions except for Mg(II). The probe potentially can be applied to the determination of Pd(II) contamination in the products of Pd(II)−catalyzed organic reactions and in pharmaceutical settings.
KeywordsWhey waste Optical probe Metal ions Molecular receptor Absorbance probe Whey proteins Coordination chemistry HR-TEM EDS
This work was supported by the Dongguk University Research Fund of 2018-2020.
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The authors confirm that there is no conflict of interest to declare.
- 2.King AO, Yasuda N (2004) Palladium-catalyzed cross-coupling reactions in the synthesis of pharmaceuticals. Organometallic Process Chemistry Berlin, Heidelberg: Springer Berlin Heidelberg, 205–245. https://doi.org/10.1007/b94551
- 8.Van Meel K, Smekens A, Behets M, Kazandjian P, Van Grieken R (2007) Determination of platinum, palladium, and rhodium in automotive catalysts using high-energy secondary target x-ray fluorescence spectrometry. Anal Chem 79(16):6383–6389. https://doi.org/10.1021/ac070815r CrossRefPubMedGoogle Scholar