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A new method of chemically immobilizing antibody on nylon was developed. The method consists of serial treatments with HCl, polyethylene imine, and maleic anhydride methylvinyl ether copolymer, which resulted in the stable immobilization of sufficient amounts of antibodies on nylon. This principle was used to differentially detect two immunologically related but nonidentical hemolysins (thermostable direct hemolysin [TDH] and TDH-related hemolysin [TRH]) of Vibrio parahaemolyticus in a modified enzyme-linked immunosorbent assay with antibodies immobilized on nylon slips (NSIT). The results (dark purple color on nylon slips) were easily evaluated by the naked eye. The results with NSIT were compatible with those obtained by using DNA probes or a conventional bacterial culture test, not only with cultured specimens but also with clinical specimens (diarrheal stool samples). Furthermore, the NSIT differentially detected TDH and TRH in a single test. The antibody immobilization method developed here is applicable to various immunological detection methods and may improve their sensitivity and specificity.

clinical and diagnostic laboratory immunology

A novel method to chemically immobilize antibody on nylon and its application to the rapid and differential detection of two Vibrio parahaemolyticus toxins in a modified enzyme-linked immunosorbent assay