The present study was conducted to determine whether degradation produ
cts of streptozotocin formed under various conditions induce hyperglyc
emia in rats. Streptozotocin is completely degraded in pH 7.4 buffer i
n 4 hr and even more rapidly plasma. Streptozotocin degradation produc
ts resulting from incubation in pH 7.4 phosphate buffer or in plasma w
ere not diabetogenic in rats.