Roascorbic acid via the intermediate radical ion semidehydroascorbic acid [43]. Oxidation of
Roascorbic acid via the intermediate radical ion semidehydroascorbic acid [43]. Oxidation of ascorbic acid was catalyzed by copper ions [44]. Moreover, ascorbic acid has antioxidant properties due to its capability to trap cost-free radicals and reactive oxygen molecules [45]. Thus, ascorbic acid plays a dual role as a lowering agent for the synthesis of CuNPs and as an antioxidant for their protection. The formation of copper nanoparticles was accompanied by their donor cceptor interaction involving the imidazole ring, which acted as a ligand (Scheme 2). Coordination was provided by the electron onor SIRT1 Inhibitor custom synthesis nitrogen in position 3 on the imidazole ring, as in the case of binding with Cu2+ [46].radicals and reactive oxygen molecules [45]. Therefore, ascorbic acid plays a dual part as a minimizing agent for the synthesis of CuNPs and as an antioxidant for their protection. The formation of copper nanoparticles was accompanied by their donor cceptor interaction involving the imidazole ring, which acted as a ligand (Scheme 2). Polymers 2021, 13, 3212 Coordination was supplied by the electron onor nitrogen in position 3 in the imidazole ring, as inside the case of binding with Cu2+ [46].6 ofScheme two. Formation of copper nanoparticles. Scheme 2. Formation and stabilizationand stabilization of copper nanoparticles.By mixing aqueous options of polymer and ascorbic acid, a clear solution was By mixing aqueous solutions of polymer and ascorbic acid, a clear answer was obtained. Soon after adding blue copper acetate answer to it, the colour in the resolution progressively obtained. Immediately after adding blue copper acetate option to it, the color on the resolution adjustments from yellow to burgundy and ultimately to maroon. The appearance of a yellow gradually alterations from yellow to burgundy and ultimately to maroon. The appearance of a colour indicated the initiation of your reduction reaction. Ascorbic acid reduces the ionic yellow color indicated the initiation of your reduction reaction. Ascorbic acid reduces the type of the metal towards the metallic state. A color modify to maroon indicates the finish from the ionic type of the metal towards the metallic state. A colour alter to maroon indicates the end of formation of copper nanoparticles. It must be noted that the coordination interaction in the formation of copper nanoparticles. It needs to be noted that the coordination copper ions with functional imidazole groups from the polymer macromolecules creates a interaction of coppermicroenvironment that contributes for the successful stabilization of nanoparticles favorable ions with functional imidazole groups of your polymer macromolecules the early stages of their formation. Through contributes towards the efficient in creates a favorable microenvironment that the synthesis, excess ascorbic acid was stabilization of nanoparticles in thereduction and prevent the oxidation of CuNPs. Moreover, in order needed to finish early stages of their formation. Through the synthesis, excess ascorbic avoid oxidation of copper nanoparticles in the course of synthesis, an PLK1 Inhibitor supplier oxygen-free environment to acid was needed to finish reduction and stay clear of the oxidation of CuNPs. In addition, so as to prevent oxidation of copper nanoparticles for the duration of was created. synthesis, an oxygen-freefound that the copper content material in nanocomposites varies from 1.eight to 12.three It was environment was produced. It was identified that the copper content material in nanocomposites varies from 1.8 1). The copper content material by elemental evaluation and atomic absorption.