For all the dextranases studied the maximum activity was distinctly 50.0 8 C, with 43.3–54.4 8 C being the optimum activity range. It has been reported [8] that high 8 Brix levels may increase the stability of dextranase to slightly higher temperatures. The lowest activity occurred at 65.5 8 C, most likely because of partial denaturation of the dextranase enzyme. Dextranase activities were also low at 26.7– 32.2 8 C, but were still better than at 65.5 8 C. This has dramatic consequences for the factory application of dextranases. Most last evaporators, where many factories have been adding dextranase (Table 2) have syrup temperatures 65.5 8 C, but the activity has dropped off dramatically at this temperature (Fig. 2). Even for those factories that are adding dextranase to juice (Table 2) where the ambient juice temperatures are 26.7–32.2 8 C, the dextranase activity is still relatively low (Fig. 2).