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Laser photoacoustic spectroscopy (PAS) has a potential to be developed as a sensitive and solid-phase analytical method and was applied to enzyme immunoassay. The test sample for immunoassay was prepared by adsorbing multi-component immunoglobulins on a nitrocellulose membrane filter. Human lambda- and kappa-chains, which are used as a principal indication of malignant lymphoreticular disease, and immunoglobulin G were used as model proteins, and PAS immunoassay was applied to the individual detection of these three proteins in the urine. Furthermore, in order to develop a sensitive analysis for particular biological components in tissues or cells, laser photoacoustic microscopy (PAM) and video intensified microscopy (VIM) were developed. PAM was shown to be applicable to the detection and quantification of human lambda-chain in a micro-region of the tissue sections of the human fetal spleen and pancreas. VIM was applied to the detection of stimulation-response processes in a cell. By using neutrophils which are stimulated by many substances and produce active oxidants as the results, dynamic changes in the stimulation-response process in a living cell were visualized as fluorescence or chemiluminescence images by the VIM system.

Development of Multicomponent Immunoassay and Micro-localization Analysis by Laser-photoacoustic and Microscopic Image Analyzer