C 1598 (OTTO) CAPS buffer, 99% Cas 1135-40-6 - used to formulate CAPS buffer, a zwitterionic buffer useful in the range of pH 7.9-11.1.C 1598 (OTTO) CAPS buffer, 99% Cas 1135-40-6 - used in Western and immunoblotting experiments as well as protein sequencing and identification.