A8592 is an HRP-conjugated antibody. The product information sheet can be downloaded here:
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/111/306/a8592dat-mk.pdf
Although we do not routinely test 3,3′,5,5′-tetramethylbenzidine (TMB) in-house, it is a standard chromogenic substrate for horseradish peroxidase, so it is expected to work with the A8592 conjugate.
QuantaBlu from ThermoFisher is a fluorogenic substrate; TMB is colorimetric.
You should expect lower sensitivity with TMB compared with QuantaBlu, as fluorescence detection generally offers higher sensitivity.
The TMB-HRP reaction produces a soluble end-product that is blue in color and can be read spectrophotometrically at 370 nm or 650 nm.
The reaction may be stopped with acid, resulting in a yellow solution that is read at 450 nm.
Published protocol for use of A8592 together with TMB include:
https://pmc.ncbi.nlm.nih.gov/articles/PMC3709174/pdf/cpb-0026-0363.pdf
https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2022.869825/full
https://www.nature.com/articles/s41556-024-01448-1






