β-Fructosidase activity in the gut of the house cricket Acheta domesticus

Abstract

1. 1. The optimal pH of β-fructosidase from the house cricket was 5.2 and the optimal temperature was probably around 45°C. The apparent activation energy was 4400 cal/mol. 2. 2. The 50% inactivation time for β-fructosidase at 50°C was 66 min and the 50% inhibition concentration for mercuric chloride was only 24.8 μM. 3. 3. The majority of β-fructosidase activity was found in the lumen of the ileum and after 5 days of starvation, all the β-fructosidase activity was gone. © 1992.