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Selected papers from the latest issue:
Electrochemical immunoassay based on gold nanoparticles and reduced graphene oxide functionalized carbon ionic liquid electrode
14 February 2012, 23:46:40
Publication year: 2012
Source: Microchemical Journal, Available online 13 February 2012
Sheng Yu, Xiaoyu Cao, Meng Yu
In this paper, a gold nanoparticles, reduced graphene oxide (R-GO) and poly(L-Arginine) composite material modified carbon ionic liquid electrode (CILE) was used as the platform for the construction of a new electrochemical carcinoembryonic antigen (CEA) immunosensor. The poly(L-Arginine)/R-GO composite film was used to modify CILE to fabricate Arg/R-GO/CILE through electropolymerization of L-Arginine on R-GO/CILE. Gold nanoparticles (AuNPs) were adsorbed on the modified electrode to immobilize the CEA antibody and to construct the immunosensor. The stepwise assembly process of the immunosensor was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). By combining the specific properties such as the biocompatibility and big surface area of AuNPs, the excellent electron transfer ability of R-GO and the high conductivity of CILE, the synergistic effects of composite increased the amounts of CEA antibody adsorbed on the electrode surface and then resulted in the greatly increase of the electrochemical responses. Under the optimal conditions, differential pulse voltammetric responses of [Fe(CN)6]were proportional to CEA concentration in the range from 0.5-200 ng mLwith the detection limit as 0.03 ng mL(S/N = 3)). The proposed immunosensor showed good reproducibility, selectivity, and acceptable stability.
Source: Microchemical Journal, Available online 13 February 2012
Sheng Yu, Xiaoyu Cao, Meng Yu
In this paper, a gold nanoparticles, reduced graphene oxide (R-GO) and poly(L-Arginine) composite material modified carbon ionic liquid electrode (CILE) was used as the platform for the construction of a new electrochemical carcinoembryonic antigen (CEA) immunosensor. The poly(L-Arginine)/R-GO composite film was used to modify CILE to fabricate Arg/R-GO/CILE through electropolymerization of L-Arginine on R-GO/CILE. Gold nanoparticles (AuNPs) were adsorbed on the modified electrode to immobilize the CEA antibody and to construct the immunosensor. The stepwise assembly process of the immunosensor was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). By combining the specific properties such as the biocompatibility and big surface area of AuNPs, the excellent electron transfer ability of R-GO and the high conductivity of CILE, the synergistic effects of composite increased the amounts of CEA antibody adsorbed on the electrode surface and then resulted in the greatly increase of the electrochemical responses. Under the optimal conditions, differential pulse voltammetric responses of [Fe(CN)6]were proportional to CEA concentration in the range from 0.5-200 ng mLwith the detection limit as 0.03 ng mL(S/N = 3)). The proposed immunosensor showed good reproducibility, selectivity, and acceptable stability.
Highlights
► AuNPs and poly(L-Arginine)/graphene composite modified carbon ionic liquid electrode. ► Combined advantages of graphene, AuNPs, poly(L-Arginine) and ionic liquid. ► Enhanced electrochemical response of carcinoembryonic antigen immunosensor. ► The immunosensor has low detection limit and wide linear range.Editorial Board
11 February 2012, 22:38:28
Publication year: 2012
Source: Microchemical Journal, Volume 102, May 2012, Pages IFC
[No author name available]
Source: Microchemical Journal, Volume 102, May 2012, Pages IFC
[No author name available]
Determination and speciation of mercury in environmental and biological samples by analytical atomic spectrometry
10 February 2012, 00:40:26
Publication year: 2012
Source: Microchemical Journal, Available online 8 February 2012
Ying Gao, Zeming Shi, Zhou Long, Peng Wu, Chengbin Zheng, ...
Mercury and its compounds are ubiquitous in the environment. Much concern has been attracted to the determination of mercury and its species due to their high toxicity and biomagnification. The state of the arts of mercury determination and speciation analysis and its applications in environmental and biological sciences since 2008 are reviewed with 133 references. The methodological innovations in sample preparation, preconcentration, instrumentation and speciation analysis are summarized, and the future perspectives are briefly discussed and speculated.
Source: Microchemical Journal, Available online 8 February 2012
Ying Gao, Zeming Shi, Zhou Long, Peng Wu, Chengbin Zheng, ...
Mercury and its compounds are ubiquitous in the environment. Much concern has been attracted to the determination of mercury and its species due to their high toxicity and biomagnification. The state of the arts of mercury determination and speciation analysis and its applications in environmental and biological sciences since 2008 are reviewed with 133 references. The methodological innovations in sample preparation, preconcentration, instrumentation and speciation analysis are summarized, and the future perspectives are briefly discussed and speculated.
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