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• W3184365616 endingPage "106691" @default.
• W3184365616 startingPage "106691" @default.
• W3184365616 abstract "In this study, a novel Cu(II) protoporphyrin polymer-based magnetic nanocomposite, [email protected], is obtained by electropolimerization of metalloporphyrin IX dimethyl ester onto Fe3O4 nanoparticles in organic medium. [email protected] are proposed as a biomimetic magnetic solid-phase extraction sorbent with high selectivity toward peptides containing histidine residues. The nanocomposite was characterized by SEM/EDX, TEM and FTIR. Magnetic saturation values for magnetic nanoparticles (MNPs), naked MNPs (74 emu g−1) and [email protected] (43 emu g−1), were obtained at 300 K. At pH 7, [email protected] show selective adsorption toward angiotensin, about 90% adsorption vs 49 % adsorption for naked MNPs. In order to evaluate the mechanisms involved in angiotensin adsorption onto [email protected], different adsorption–desorption conditions and the model that describes the adsorption isotherm for both sorbents were determined. The parameters of fitting analyses were qm = 2.55 mg g−1 and b = 0.012 L mg−1 by Langmuir model for naked MNPs, and KF = 0.4105 mg g−1 and n = 2.09 by Freundlich model for [email protected] This indicates that [email protected] have heterogenous adsorption surface and different adsorption sites. The Freundlich exponent greater than 1 suggests strong adsorption interactions between angiotensin and this magnetic solid-phase extraction (MSPE) nanomaterial. The selectivity the [email protected] toward angiotensin was evaluated in an aqueous mixture composed of four peptides by capillary electrophoresis. Finally, the intrinsic characteristics of the magnetic substrate, the stable inclusion of the copper in an environment that favors the interaction with histidine residues, in addition to easy and reproducible preparation of the nanocomposite offer a very interesting strategy for the design of the MSPE sorbents." @default.
• W3184365616 created "2021-08-02" @default.
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• W3184365616 date "2021-11-01" @default.
• W3184365616 modified "2023-10-10" @default.
• W3184365616 title "Preparation of a biomimetic Cu(II) protoporphyrin magnetic nanocomposite and its application for the selective adsorption of angiotensin I" @default.
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• W3184365616 doi "https://doi.org/10.1016/j.microc.2021.106691" @default.
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