We present a surface plasmon resonance sensor base on prism excitation of surface plasmons and spectral interrogation. For specific detection of biomolecular analytes, multilayers of monoclonal antibodies are immobilized on the surface of the sensor. Detection of biomolecular analytes such as human (beta) -2)-microglobulin, choriogonadotropin, hepatitis B surface antigen, salmonella enteritidis is demonstrated.
A novel design of surface plasmon resonance fiber optic sensor is reported which leads to a compact, highly miniaturized sensing element with excellent sensitivity. The sensing device is based on a side-polished single-mode optical fiber with a thin metal overlayer supporting surface plasmon waves. The strength of interaction between a fiber mode and a surface plasmon wave depends strongly on the refractive index near the sensing surface. Therefore, refractive index changes associated with biospecific interaction between antibodies immobilized on the sensor and antigen molecules can be monitored by measuring light intensity variations. Detection of horse radish peroxidase (HRP) of the concentration of 100 ng/ml has been accomplished using the fiber optic sensor with a matrix of monoclonal antibodies against HRP immobilized on the sensor surface.
The exploitation of surface plasmon resonance (SPR) sensing principle for the study of formation of multilayers of human immunoglobulin (hlgG) and monoclonal antibody against human choriogonadotropin (a-hCG) as well as for monitoring immunoreaction between the immobilized a-hCG and human choriogonadotropin (hCG) is reported. It is demonstrated that even a very small attachment of proteins (due to the adsorption or the specific interaction) may be detected by the presented SPR sensor. An immobilization technique is described which allows to form stable multilayers of antibodies on the gold surface.
Langmuir—Blodget (LB) films are thin or ultrathin molecular layer systems. They are good basis for the creation of molecular encembles with predetermined architecture including superlattices and quasi two-dimensional systems. This opens new possibilities for a detailed investigation of various intermolecular coupling. In this paper we present preliminary fluorescence hole burning data of metal-free tetra-4-terc-butyl phthalocyanine (H2TTBPc) in LB film.
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