Luminescent visualization of antigens on blots.

Proteins separated by SDS gel electrophoresis and transferred to a nitrocellulose sheet can be visualised by 'probing' with peroxidase-linked reagents which are detected by luminescence. A modified luminescent substrate is described containing 4-methylumbelliferone which enhances light emission four-fold. Using the modified substrate, luminescent detection was found to be more sensitive than chromogenic detection of peroxidase using 4-chloro-1-napthol. The new technique was used in conjunction with the immunoblot method to demonstrate antigenic differences between rat and mouse erythrocytes.