Home / Products / Enzyme Substrates / Enzyme Blocking Reagents Enzyme Blocking Reagents Tissues can contain endogenous peroxidase, pseudoperoxidase, and/or alkaline phosphatase activity that will produce background staining if an alkaline phosphatase and/or peroxidase detection system and corresponding substrates are used. BLOXALL™ Endogenous Peroxidase/Alkaline Phosphatase Blocking Solution (SP-6000) inactivates endogenous peroxidase, pseudoperoxidase, and alkaline phosphatase in formalin-fixed, paraffin-embedded tissue sections, frozen tissue sections, and cell preparations in a single 10 minute incubation step. This reagent is provided as a ready-to-use reagent in a convenient dropper bottle. Alternatively, if an alkaline phosphatase development system and substrate are used, Levamisole Solution (SP-5000), an inhibitor of alkaline phosphatase, can be added to the alkaline phosphatase substrate solution. Levamisole does not inhibit the isoenzyme used for either the VECTASTAIN® ABC-AP, ImmPRESS_AP reagents or other alkaline phosphatase conjugates. It is supplied as a 100x concentrated stock in a conenient dropper bottle. 2 Showing Position Name Catalog Number Price View as: List Grid Show 30 60 120 BLOXALL Endogenous Peroxidase and Alkaline Phosphatase Blocking Solution Catalog Number: SP-6000 Unit Size: 100 ml Add to Wishlist | Add to Compare As low as: $84.00 $105.00 Add to Cart Levamisole Solution Catalog Number: SP-5000 Unit Size: 18 ml Add to Wishlist | Add to Compare As low as: $100.00 $125.00 Add to Cart 2 Showing Position Name Catalog Number Price View as: List Grid Show 30 60 120 Didn't find what you were looking for? Submit a suggestion.