I require 100 uL of bovine ribonuclease III-A stock solution (5mg/mL). The product from Sigma-Aldrich is a very fluffy substance. I need to inactivate this twice at 100 degree C twice. Does anyone know this particular procedure?
Make the solution at desired concentration of RNAse in a good quality polypropylene tube that can sealed well. Place it in a boiling water bath and let it stand for 15-20 min. Remove the tube and let it cool down. Repeat the process one more time. Freeze the solution for storage and future use.