Laminine(Ln) has been identified as an important marker of liver fibrosis or cirrhosis. The Ln immunosensor was formed with thioglycolic acid to produce a self-assembled monolayer on the gold electrode surface. The monoclonal Ln antibody was orderly immobilized on the modified gold surface covalently using EDC/NHS. An unlabeled antigen combined on the antibody could reduce the capacitance of the electrode, which was evaluated by the potentiostatic method. The measurement was performed in microseconds. Ln antigen could be determined in the range of 2-50 ng/mL. The quick response made the immunosensor a promising clinical screening method.
