Rapid and sensitive detection of microcystin by immunosensor based on nuclear magnetic resonance.
A stable and sensitive toxin residues immunosensor based on the relaxation of magnetic nanoparticles was developed. The method was performed in one reaction and offered sensitive, fast detection of target toxin residues in water. The target analyte, microcystin-LR (MC-LR) in Tai lake water, competed with the antigens on the surface of the magnetic nanoparticles and then influenced the formation of aggregates of the magnetic nanoparticles. Accordingly, the magnetic relaxation time of the magnetic nanoparticles was changed under the effect of the target analyte. The calibration curve was deduced at different concentrations of the target analyte. The limit of detection (LOD) of MC-LR was 0.6 ng g(-1) and the detection range was 1-18 ng g(-1). Another important feature of the developed method was the easy operation: only two steps were needed (1) to mix the magnetic nanoparticle solution with the sample solution and (2) read the results through the instrument. Therefore, the developed method may be a useful tool for toxin residues sensing and may find widespread applications.
Ma
Wei
W
School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu Province, China.
Chen
Wei
W
Qiao
Ruirui
R
Liu
Chunyan
C
Yang
Chunhui
C
Li
Zhuokun
Z
Xu
Dinghua
D
Peng
Chifang
C
Jin
Zhengyu
Z
Xu
Chuanlai
C
Zhu
Shuifang
S
Wang
Libing
L
D005618:Fresh Water / Q000032:analysis*; D007118:Immunoassay / Q000191:economics / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000191:economics / Q000379:methods*; D008280:Magnetics; D008387:Marine Toxins; D052998:Microcystins / Q000032:analysis* / Q000276:immunology; D053758:Nanoparticles; D012680:Sensitivity and Specificity; D013997:Time Factors
D008387:Marine Toxins; D052998:Microcystins; C057862:cyanoginosin LR