Description: A strong chaotropic agent useful for the denaturation8,10 and subsequent refolding of proteins.3 This strong denaturant can solubilize insoluble or denatured proteins5 such as inclusion bodies6 and be used for the recovery of periplasmic proteins.7,9 This can be used as the first step in refolding proteins or enzymes into their active form. Urea and dithiothreitol (DTT) may also be necessary. Also used in the isolation of RNA.