Abstract
Placing 2-microns sections of tissue-free glycol methacrylate on top of tissue sections is a simple way of forming semipermeable membranes to enhance enzyme histochemical staining. For demonstrating alkaline phosphatase in glycol methacrylate-embedded kidney by a standard azo dye method, such membranes enabled incubation times to be reduced to 1-2 hr, with azo dye reaction product being more crisply localized as compared to sections stained without membranes. Such effects are possible because the membranes are highly permeable to small molecules (e.g., substrate and diazonium salt), slightly permeable to molecules of moderate size (e.g., the final reaction product), and impermeable to large molecules (e.g., alkaline phosphatase and other tissue biopolymers). The implications of these findings for enzyme histochemistry and for enzyme-labeled antibody staining are discussed.