Analytical, thermodynamical and kinetic characteristics of photoluminescence immunosensor for the determination of Ochratoxin A

- Photoluminescence (PL) immunosensor for the determination of Ochratoxin A (OTA).
- PL immunosensor is based on of ZnO nanorods (ZnO-NRs).
- OTA-selective layer (ZnO-NRs/anti-OTA) is based on antibody against OTA (anti-OTA).
- Association constant and ΔG for anti-OTA and OTA interaction were calculated.
- PL-based immunosensor was integrated within portable fiber optic detection system.

Ochratoxin A (OTA) is one of the most widespread and dangerous food contaminants. Therefore, rapid, label-free and precise detection of low OTA concentrations requires novel sensing elements with advanced bio-analytical properties. In the present paper we report photoluminescence (PL) based immunosensor for the detection of OTA. During the development of immunosensor photoluminescent ZnO nanorods (ZnO-NRs) were deposited on glass substrate. Then the ZnO-NRs were silanized and covalently modified by Protein-A (Glass/ZnO-NRs/Protein-A). The latest structure was modified by antibodies against OTA (Anti-OTA) in order to form OTA-selective layer (Glass/ZnO-NRs/Protein-A/Anti-OTA). In order to improve immunosensors selectivity the surface of Glass/ZnO-NRs/Protein-A/Anti-OTA was additionally blocked by BSA. Formed Glass/ZnO-NRs/Protein-A/BSA&Anti-OTA structures were integrated within portable fiber optic detection system, what is important for the development of low cost and portable immunosensors. The immunosensor has been tested in a wide range of OTA concentrations from 10−4 ng/ml until 20 ng/ml. Interaction isotherms were derived from analytical signals of immunosensor. Association constant and Gibbs free energy for the interaction of Glass/ZnO-NRs/Protein-A/Anti-OTA with OTA were calculated, analyzed and compared with some other related results. Sensitivity range and limit of detection were determined as 0.1-1 ng/ml and 10−2 ng/ml, respectively. Interaction kinetics of ZnO-NRs with OTA was evaluated. Response time of the immunosensor toward OTA was in the range of 500-800 s. Some insights related to the mechanism of PL-signal generation are proposed and discussed.

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