pp. 737-744
S&M1037 Research Paper https://doi.org/10.18494/SAM.2014.1026 Published: December 22, 2014 Signal Enhancement of Indirect-Competitive Metallothionein Immunosensor by Horseradish-Peroxidase-Induced Precipitation of Diaminobenzidine Derivatives [PDF] Namsoo Kim (Received February 17, 2014; Accepted September 12, 2014) Keywords: signal enhancement, indirect-competitive metallothionein sensor, horseradish peroxidase (HRP)-induced precipitation, diaminobenzidine derivatives
An indirect-competitive quartz crystal microbalance immunosensor is well acknowledged as a tool for biological detection. As a method of improving sensitivity, horseradish-peroxidase-induced precipitation of 3,3’-diaminobenzidine (DAB) derivatives to the sensor surface, which was confirmed by field emission-scanning electron microscopy imaging, was conducted using metallothionein (MT) as a model analyte. The sensor signal was enhanced up to 5.3-fold when the DAB g/ml. Linearity in response signal was found in the MT range of 0.05–1 ng/ml, with the limit of detection of 50 pg/ml. The present biosensor can serve as a highly sensitive detection tool for biomarkers of physiological importance.
Corresponding author: Namsoo KimCite this article Namsoo Kim, Signal Enhancement of Indirect-Competitive Metallothionein Immunosensor by Horseradish-Peroxidase-Induced Precipitation of Diaminobenzidine Derivatives, Sens. Mater., Vol. 26, No. 10, 2014, p. 737-744. |