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Template-assisted Cu2O@Fe(OH)3 yolk-shell nanocages as biomimetic peroxidase: A multi-colorimetry and ratiometric fluorescence separated-type immunosensor for the detection of ochratoxin A

文献类型： 外文期刊

作者： Zhu, Hongshuai 1 ; Cai, Yue 1 ; Qileng, Aori 1 ; Quan, Zhu 1 ; Zeng, Wei 1 ; He, Kaiyu 3 ; Liu, Yingju 1 ;

作者机构： 1.South China Agr Univ, Coll Mat & Energy, Key Lab Bio Based Mat & Energy, Minist Educ, Guangzhou 510642, Peoples R China

2.South China Agr Univ, Coll Food Sci, Guangdong Prov Key Lab Food Qual & Safety, Guangzhou 510642, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Agroprod Safety & Nutr, State Key Lab Managing Biot & Chem Treats Qual &, Hangzhou 310021, Peoples R China

关键词： Cu2O@Fe(OH)3 nanocages; Immunosensor; Carbon dots; Ochratoxin A; Mimetic peroxidase

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：9.038； 五年影响因子：8.512 ）

ISSN： 0304-3894

年卷期： 2021 年 411 卷

页码：

收录情况： SCI

摘要： The convenient and effective detection of toxins is urgently demanded for food security and human health. Herein, based on the catalytic activity of mimetic peroxidase from the Cu2O@Fe(OH)3 yolk-shell nanocages, a dual-modal multi-colorimetric and ratiometric fluorescence immunosensor for the sensitive detection of ochratoxin A (OTA) was successfully developed. For the multi-colorimetric detection, H2O2 can be effectively decomposed by Cu2O@Fe(OH)3 to form ?OH groups, thus Au nanorods (Au NRs) can be etched to exhibit vivid color variations and localized surface plasmon resonance (LSPR) shifts. For the ratiometric fluorescence detection, o-phenylenediamine was oxidized by Cu2O@Fe(OH)3 to form 2,3-diaminophenazine (DAP) in the presence of H2O2. Interestingly, the exogenous fluorescence signal source of carbon dots can be quenched by DAP via inner filter effect, while a new emission peak at 563 nm can be discovered, forming a ratiometric fluorescence signal. Due to the independent signals and mutual confirmation, the performance of the dual-modal immunosensor for the detection of OTA was significantly improved, where a broad linear range from 1 ng/L to 10 ?g/L with a detection limit of 0.56 ng/L (S/N = 3) was achieved. The sensing strategy was also used to monitor OTA in millet and lake water samples with a satisfied performance.

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