For protease-sensitive immunoassays, to stabilise peptides, proteins and enzymes in buffer solutions and prior to freeze-drying, as a stabiliser for long-term storage of highly diluted antibody solutions, to block non-specific adsorption of proteins in immunoassays such as Western blots, ELISA. Produced by heat shock fractionation, heated twice to ensure inactivation of proteases. For protease-sensitive immunoassays, to stabilise peptides, proteins and enzymes in buffer solutions and prior to freeze-drying, as a stabiliser for long-term storage of highly diluted antibody solutions, to block non-specific adsorption of proteins in immunoassays such as Western blots, ELISA. Produced by heat shock fractionation, heated twice to ensure inactivation of proteases.