S-S bonds are not required for the sonochemical formation of proteinaceous microspheres: the case of streptavidin.

Proteinaceous microspheres can be prepared using the sonochemical method. However, it is known that these proteins should possess at least one cysteine residue in order to obtain stable microspheres using this method. In the present study, we have produced streptavidin microspheres, using the sonochemical method, from streptavidin, which does not have any cysteine residues.