Metal ions-based immunosensor for simultaneous determination of estradiol and diethylstilbestrol.
Environmental estrogens (EEs) can cause various endocrine diseases. Herein, we designed an ultrasensitive electrochemical immunosensor for simultaneous detection of two typical EEs, estradiol and diethylstilbestrol. These two analytes were immobilized on graphene sheet (GS) modified glassy carbon electrode (GCE). Amino-group functionalized mesoporous Fe3O4 (Fe3O4-NH2) was loaded with Pb(2+) or Cd(2+), and then incubated with estradiol and diethylstilbestrol antibodies, respectively. Using an electrochemical analysis technique, two well-separated peaks were generated by the redox reaction of Pb(2+) or Cd(2+), making the simultaneous detection of two analytes on the electrode possible. Subsequently, square wave anodic stripping voltammetry (SWASV) and electrochemical impedance spectroscopy (EIS) were used to investigate the electrochemical behaviors of the immunosensor. Under optimized conditions, the SWASV peak currents were proportional to the concentrations of estradiol and diethylstilbestrol in the range from 0.050 pg mL(-1) to 100 ng mL(-1) and 1.0 pg mL(-1) to 100 ng mL(-1), respectively. The immunosensor exhibited highly sensitive response to estradiol with a detection limit of 0.015 pg mL(-1) and diethylstilbestrol with a detection limit of 0.38 pg mL(-1). Furthermore, the immunosensor was satisfactorily employed to detect estradiol and diethylstilbestrol simultaneously in water samples.
Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
Sen
S
Zhang
Bin
B
Du
He
H
Li
Xiaodong
X
Xin
Hongmin
H
Ma
Dan
D
Wu
Liangguo
L
Yan
Qin
Q
Wei
D015374:Biosensing Techniques / Q000379:methods*; D002104:Cadmium / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D058266:Dielectric Spectroscopy; D004054:Diethylstilbestrol / Q000302:isolation & purification*; D004958:Estradiol / Q000302:isolation & purification*; D006108:Graphite / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D057230:Limit of Detection; D014877:Water Pollution, Chemical
D007477:Ions; D002104:Cadmium; D004958:Estradiol; D004054:Diethylstilbestrol; D002244:Carbon; D006108:Graphite; D003300:Copper
Cadmium ion; Diethylstilbestrol; Estradiol; Lead ion; Simultaneous detection