Cd-Cysteine Nanorods as a Fluorescence Sensor for Determination of Fe (III) in Real Samples

Abstract

A new Cd-Cysteine complex nanorods (Cd-Cys NRs) were synthesized in one step at room temperature, and its morphology, structure and spectral properties were characterized by transmission electron microscopy (TEM), elemental analysis (EA), X-Ray diffraction (XRD), solid state and normal UV-Vis, Fourier transform infrared (FTIR) and spectrofluorometry. The developed Cd-Cys NRs were used as a fluorescence sensor for detection of Fe (III) in different aqueous matrices. The selectivity and sensitivity of the fabricated nano-sensor based on its fluorescence quenching in the presence of Fe (III) were probed according to the Stern-Volmer equation. The detection limit of the method was in micro-molar per liter range. Cd-Cys NRs response tested in different complex samples such as Rosemary plant leaves, exhibited a well-defined response. Anticoagulation measurements were performed to evaluate their blood biocompatibility.

Role of Reduced Sulfur in the Transformation of Cd(II) Immobilized by δ-MnO2

“…For cysteine systems, new peaks emerged in the XRD pattern of pH7.5_4Cys as compared to five other XRD patterns. The peaks at 8.6, 19.7, 25.0, 26.3, 33.6, and 40.0° 2θ in the XRD pattern of pH7.5_4Cys were coincident with the patterns of Cd–cysteine nanorods reported by Ghiamati and Boroujerdi . Cd–cysteine formation in the current study could be ascribed to the Cd­(II) release to the solution due to δ-MnO 2 corrosion, followed by the precipitation of Cd­(II) with redundant cysteine.…”

“…The peaks at 8.6, 19.7, 25.0, 26.3, 33.6, and 40.0°2θ in the XRD pattern of pH7.5_4Cys were coincident with the patterns of Cd−cysteine nanorods reported by Ghiamati and Boroujerdi. 45 Cd−cysteine formation in the current study could be ascribed to the Cd(II) release to the solution due to δ-MnO 2 corrosion, followed by the precipitation of Cd(II) with redundant cysteine. The coexistence of Cd−cysteine and δ-MnO 2 in the pH7.5_4Cys system indicated that oxidation of cysteine by δ-MnO 2 would be impeded when cysteine was complexed with Cd(II), similar to the previous study where the complexation of glutathione by Hg(II) and Ag(I) protected thiol functional groups (R−S−) from oxidation by H 2 O 2 and Cu(II).…”

“…42 The absence of S− H at 2551 cm bound to thiol group in Cd−cysteine. 45 The FTIR spectrum of the pH7.5_4Cys system exhibited the characteristic peaks of Cd−cysteine. No characteristic peaks of cystine 48 were observed in cysteine systems (Figure S5).…”

Detection of Al3+ and Fe3+ Ions with Phthalocyanine‐Merocyanine 540 Dye‐Based Fluorescence Resonance Energy Transfer

“…Therefore, several studies on Fe 3+ detection have been reported in the literature. [11][12][13][14][15] Aluminum is the third most abundant element in the biosphere. Due to increasing environmental pollution, the amount of Al 3+ accumulation in living organisms is on the increase.…”

“…The Environmental Protection Agency (EPA) determined the maximum limit value for Fe 3+ in drinking water to be 5.37 μM. Therefore, several studies on Fe 3+ detection have been reported in the literature 11–15 …”