title: Fenton reaction-based colorimetric immunoassay for sensitive detection of brevetoxin B.
abstract: We designed a new colorimetric immunoassay for sensitive monitoring of brevetoxin B (BTB) using enzyme-controlled Fenton reaction with a high-resolution 3,3',5,5'-tetramethylbenzidine (TMB)-based visual colored system. Upon addition of hydrogen peroxide (H2O2), the equivalent iron(II) could be first converted into iron(III) and free hydroxyl radical (•OH) via the classical Fenton reaction. Then the as-produced iron(III) and •OH could cause a perceptible change from colorless to blue with the increasing H2O2 concentration in the presence of TMB. Based on Fenton reaction-triggered visual colored system, a novel competitive-type colorimetric enzyme immunoassay was developed for the quantitative screening of target BTB on the bovine serum albumin-BTB-modified magnetic bead using glucose oxidase/anti-BTB antibody-labeled gold nanoparticle as the signal-transduction tag. Upon target BTB introduction, the analyte competed with the conjugated BTB on the magnetic bead for anti-BTB antibody on gold nanoparticle. The carried glucose oxidase with the gold nanoparticle could implement the oxidation of glucose to produce H2O2, and the generated H2O2 promoted the above-mentioned Fenton reaction for color development. Under the optimal conditions, the absorbance decreased with the increasing target BTB in the range from 0.1 to 150 ng kg(-1) with a low detection limit (LOD) of 0.076 ng kg(-1). The LOD was 500-fold lower than that of commercialized Abraxis BTB ELISA kit. Non-specific adsorption was not observed. The precision, reproducibility and specificity were acceptable. Finally, the method accuracy was also validated for monitoring spiked seafood samples, giving results well matched with the referenced brevetoxin ELISA kit.
authors: State Key Laboratory of Photocatalysis on Energy and Environment, Key Laboratory of Analysis and Detection for Food Safety (Fujian Province & MOE), Institute of Nanomedicine and Nanobiosensing, Department of Chemistry, Fuzhou University, Fuzhou 350108, PR China.
authors: Wenqiang
authors: W
authors: Lai
authors: State Key Laboratory of Photocatalysis on Energy and Environment, Key Laboratory of Analysis and Detection for Food Safety (Fujian Province & MOE), Institute of Nanomedicine and Nanobiosensing, Department of Chemistry, Fuzhou University, Fuzhou 350108, PR China.
authors: Qiaohua
authors: Q
authors: Wei
authors: State Key Laboratory of Photocatalysis on Energy and Environment, Key Laboratory of Analysis and Detection for Food Safety (Fujian Province & MOE), Institute of Nanomedicine and Nanobiosensing, Department of Chemistry, Fuzhou University, Fuzhou 350108, PR China.
authors: Junyang
authors: J
authors: Zhuang
authors: Institute of Environmental and Analytical Science, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, Henan, PR China.
authors: Minghua
authors: M
authors: Lu
authors: State Key Laboratory of Photocatalysis on Energy and Environment, Key Laboratory of Analysis and Detection for Food Safety (Fujian Province & MOE), Institute of Nanomedicine and Nanobiosensing, Department of Chemistry, Fuzhou University, Fuzhou 350108, PR China. Electronic address: dianping.tang@fzu.edu.cn.
authors: Dianping
authors: D
authors: Tang
mesh_terms: D015374:Biosensing Techniques; D003124:Colorimetry; D004797:Enzyme-Linked Immunosorbent Assay; D006046:Gold / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry; D007118:Immunoassay; D007501:Iron / Q000737:chemistry; D057230:Limit of Detection; D008387:Marine Toxins / Q000737:chemistry / Q000302:isolation & purification*; D035964:Oxocins / Q000737:chemistry / Q000302:isolation & purification*; D000095702:Polyether Toxins
chemical_list: D006046:Gold; D006861:Hydrogen Peroxide; D017665:Hydroxyl Radical; D007501:Iron; D008387:Marine Toxins; D035964:Oxocins; C043466:brevetoxin B; D000095702:Polyether Toxins
keywords: Brevetoxin B; Colorimetric immunoassay; Fenton reaction; Gold nanoparticles; Magnetic beads