Isolated rat pancreatic islets were cryopreserved in the presence of e
thylene glycol at a slow cooling rate (-0.3 degrees C/min) without usi
ng either stepwise addition or sucrose-mediated dilution methods. The
glucose-stimulated insulin release of the islets cryopreserved with et
hylene glycol did not differ from that of islets cryopreserved with di
methyl sulfoxide. These findings indicate that ethylene glycol is usef
ul as a new cryoprotectant for rat islets.