I am planning to extract total protein from tumor tissue and to coat it as antigen for Indirect ELISA application. Please let me know what buffer I should use to dissolve the protein so that it can be used for ELISA.
1X PBS, pH 7.4 or carbonate-bicarbonate buffer, pH 9.6 should be fine. But you have to optimise both of them to see which one is more suitable for your system. All the best!
You should select a buffer close to the isoelectric point of your protein and avoid using surfactants. This will increase the amount of adsorbed molecules.