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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor
Published on: February 16, 2018
Chiral-Specific Recognition-Based Organic Photoelectrochemical Transistor Biosensor for Ultrasensitive Detection of
Peng Ju1,2,3, Shanding Zhou1,3, Jingtian Chi1
1Qingdao Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation, Marine Bioresource and Environment Research Center, First Institute of Oceanography, Ministry of Natural Resources, No. 6 Xianxialing Road, Qingdao 266061, PR China.
This study introduces a novel biosensor for detecting marine toxins. It uses chiral self-assembly in organic photoelectrochemical transistors (OPECT) for sensitive and selective okadaic acid (OA) detection, crucial for environmental and food safety.
Area of Science:
- Chiral functional materials
- Organic electronics
- Biosensing
Background:
- Chiral materials offer unique optical properties but are underexplored in organic photoelectrochemical transistors (OPECT).
- Chiral self-assembly in OPECT enables enantiomer recognition and chiral information conversion.
- Marine algal toxins like okadaic acid (OA) pose significant risks to environmental and food safety.
Purpose of the Study:
- To develop a sensitive and selective biosensor for quantitative okadaic acid (OA) detection.
- To explore the application of chiral self-assembly in OPECT for toxin recognition.
- To establish a method for monitoring marine ecological environment safety and food security.
Main Methods:
- A competitive immunoassay utilizing liposome-encapsulated l-cysteine (l-Cys) as an electron donor.
- Immobilization of okadaic acid-bovine serum albumin (OA-BSA) on liposome surfaces for antibody competition.
- Chiral recognition self-assembly of released l-Cys with l-porphyrin on a CdIn2S4-gated OPECT device.
Main Results:
- The OPECT biosensor demonstrated a significant photocurrent increase upon l-Cys release and self-assembly.
- A dose-dependent relationship was observed between OA concentration and photocurrent modulation.
- Achieved high sensitivity with a low detection limit of 33.8 pM for OA detection.
Conclusions:
- The developed OPECT platform effectively utilizes chiral-specific recognition for quantitative OA determination.
- This approach offers a promising tool for the effective monitoring of marine ecological environment safety.
- The study highlights the potential of chiral functional materials in advanced biosensing applications for food security.
