Preparation of Liposome@Ag/Au Nanocomposites and Their Interaction with H2O2†

doi:10.7503/cjcu20180667

Abstract

Abstract:

Liposome@Ag/Au nanocomposites were synthesized by chemical reduction using liposome as template, and their interaction with hydrogen peroxide was studied. The nanocomposites were characterized by transmission electron microscopy(TEM), UV-Vis absorption spectra and surface enhanced Raman spectra(SERS). In the presence of hydrogen peroxide and nanocomposites, 3,3',5,5'-tetramethylbenzidine(TMB) was added as the chromogenic solution, and the colorless TMB was oxidized to blue oxTMB. The characteristic absorption peak of oxTMB at 652 nm and its surface enhanced Raman spectra could be detected during the reaction. It was found that when the concentration of hydrogen peroxide was in the range of 15—100 μmol/L, the absorption intensity of oxTMB was linear with the concentration. The ultra-sensitive detection of hydrogen peroxide can be realized and the detection limit is 0.5 μmol/L.

Key words: Gold, Silver, Nanocomposites, Peroxidase-like, H₂O₂

CLC Number:

O611

TrendMD:

CHEN Yan,DONG Xuejiao,SHAN Guiye. Preparation of Liposome@Ag/Au Nanocomposites and Their Interaction with H₂ $O 2 †$ [J]. Chem. J. Chinese Universities, 2019, 40(4): 639.

Figures/Tables 6

Scheme 1 Schematic illustration for the Fabrication of liposome@Ag/Au nanocomposites

Fig.1 TEM(A) and HRTEM(B) images of liposome@Ag/Au nanocomposites, enlarged image of (A) (C), HAADF-STEM image(D) and EDX element mapping of elements Au(E), Ag(F) of liposome@Ag/Au nanocomposites

Fig.2 UV-Vis absorption spectra of liposome, Ag NPs, liposome@Au nanocomposites, and liposome @Ag/Au nanocomposites(A) and SERS spectra of RhB loaded liposome@Au nanocomposites and liposome@Ag/Au nanocomposites(B)λex=633 nm.

Scheme 2 Process of oxidation of TMB by liposome@Ag/Au nanocomposites interacting with hydrogen peroxide

Fig.3 UV-Vis absorption spectra(A) and Raman spectra(B) of TMB molecule in the presence of H2O2 with mimic enzyme of liposome@Ag/Au nanocomposites, liposome@Au nanocomposites and ESR signals(C) of hydroxyl radicals generated by liposome@Ag/Au nanocomposites, liposome@Au nanocomposites in the presence of H2O2

Fig.4 UV-Vis absorption spectra of TMB in the presence of different concentrations of H2O2 using liposome@Ag/Au nanocomposites as mimetic enzyme(A) and H2O2 concentration-dependent absorbance change at 652 nm(B)The inset in(B) is the linear calibration plot between the absorbance at 652 nm and the H2O2 concentration.

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Preparation of Liposome@Ag/Au Nanocomposites and Their Interaction with H₂ $O 2 †$

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