Feasibility of optical waveguide immunosensors for pesticide detection: physical aspects
نویسندگان
چکیده
The feasibility of detecting small molecules such as pesticides using optical evanescent-wave sensors is discussed with emphasis on the Mach-Zehnder sensor and a newly developed sensor called a ‘critical’ sensor. For direct detection of an estimated average pesticide layer growth of 2X 10m4 nm, the sensitivity of the Mach-Zehnder sensor is almost adequate (lx lo-” nm within one hour), whereas that of the ‘critical’ sensor (2X10-* nm) is not sufficient. However, the simplicity of this latter sensor is very attractive. Results of ru-hSA/hSA immunoreaction experiments obtained with this last type of sensor are presented. Keyword.~ Immunosensors; Optical waveguides; Pesticides
منابع مشابه
Feasibility of evanescent wave interferometer immunosensors for pesticide detection: chemical aspects
A waveguide Mach-Zehnder Interferometer (MZI) immunosensor has been developed which can detect, in a direct way, a minimum average layer growth thickness of the analyte of 2X 10e3 nm (bound mass, I’=lX low4 fig cm-“). The design and fabrication of the sensor and the experimental set-up are aimed at decreasing the detection limit. A flow cell has been designed and incorporated into the set-up to...
متن کاملThe phenomenon of fluorescence in immunosensors.
The phenomenon of fluorescence in immunosensors is described in this paper. Both structure and characteristics of biosensors and immunosensors are presented. Types of immunosensors and the response of bioreceptor layers to the reaction with analytes as well as measurements of electrochemical, piezoelectric and optical parameters in immunosensors are also presented. In addition, detection techni...
متن کاملElectrochemical Immunosensor for Pesticide Residues Detection in Food Analysis
Electrochemical immunosensors have emerged as a highly sensitive and rapid technique for chemical contaminants detection in environmental monitoring, food safety and quality control. This review concentrates on recent advances made in detection and quantification of chemical contaminants such as pesticides and antibiotics residues with electrochemical immunosensors. In this paper, the preparati...
متن کاملDesign of Arrayed Waveguide Grating based Optical Switch for High Speed Optical Networks
This paper demonstrates the design of an Arrayed Waveguide Gratings (AWG) based optical switch. In the design both physical and network layer analysis is performed. The physical layer power and noise analysis is done to obtain Bit Error Rate (BER). This has been found that at the higher bit rates, BER is not affected with number of buffer modules. Network layer analysis is done to obtain perfor...
متن کاملRecent Advance of Electrochemical Immunosensor for Pesticide Residues Detection
Electrochemical immunosensors have emerged as a highly sensitive and rapid technique for the detection of specific pesticide based on the immunological interactions between the binding biomolecules (antibody or hapten) onto the transducer interface and the target analyte (hapten or antibody). In terms of the development of electrochemical immunosensors, the antibody (Ab) /hapten immobilization ...
متن کامل