 She has also investigated trehalose glycopolymers that contain pendant pyridyl disulfide groups.If polymers only contain side-chain trehalose, they can stabilise a granulocyte colony-stimulating factor and degrade via hydrolysis.If they containpyridyl disulfide groups they can be cross-linked into nanoparticles using peptide glucagon, made bioactive "in vitro," neutral to pH and protected from making aggregates.