A sensitive and highly stable electrochemical impedance immunosensor based on the formation of silica gel-ionic liquid biocompatible film on the glassy carbon electrode for the determination of aflatoxin B1 in bee pollen.
The paper describes a sensitive and highly stable label-free electrochemical impedance immunosensor for the determination of aflatoxin B(1) (AFB(1)), which is based on the formation of silica gel-ionic liquid biocompatible film on the glassy carbon electrode. The electrochemical performances of the sensor were investigated by electrochemical impedance spectroscopy using a Fe(CN)(6)(3-/4-) phosphate buffer solution as base solution for test. As new ionic liquid, 1-amyl-2,3-dimethylimidazolium hexafluorophosphate, offers a very biocompatible microenvironment for AFB(1) antibody, the sensor exhibits good repeatability (RSD=1.2%), sensitive electrochemical impedance response to AFB(1) in the range of 0.1-10 ng ml(-1) and lowers the detection limit of AFB(1) (0.01 ng ml(-1)). The electron-transfer resistance change of the sensor after and before incubation with AFB(1) of 2.0 ng ml(-1) can retain 95% over a 180-day storage period at 4 degrees C. The results present a remarkable improvement of sensitivity (2-fold) and long-term stability (190-fold) when compared to classical silica gel sensor. Moreover, proposed sensor has a high selectivity to AFB(1) alone with no significant response to AFB(2), AFG(1), AFG(2) and AFM(1) as single substrates, it has been successfully applied to the determination of trace AFB(1) in bee pollen samples with a spiked recovery in the range of 96.0-102.5%.
School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Dadao, Wuxi 214122, China. zaijunli@263.net
Li
L
Zaijun
Wang
W
Zhongyun
Sun
S
Xiulan
Fang
F
Yinjun
Chen
C
Peipei
D016604:Aflatoxin B1 / Q000032:analysis* / Q000276:immunology; D000818:Animals; D001516:Bees; D015374:Biosensing Techniques / Q000379:methods*; D004563:Electrochemistry / Q000379:methods; D005782:Gels / Q000737:chemistry; D007118:Immunoassay / Q000379:methods*; D052578:Ionic Liquids / Q000737:chemistry; D057230:Limit of Detection; D011058:Pollen / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry
D005782:Gels; D052578:Ionic Liquids; D012822:Silicon Dioxide; D016604:Aflatoxin B1