Is able to hydrolyze various linear maltooligosaccharides (maltotriose to maltoheptaose) and cyclomaltodextrins (CDs), to mainly glucose and maltose, by liberating glucose from the reducing end of the molecules. Shows a very weak activity on starch. Can neither hydrolyze maltose nor degrade pullulan, but rapidly hydrolyzes acarbose, a strong amylase and glucosidase inhibitor, to acarviosine and glucose. cyclomaltodextrin + H2O = linear maltodextrin Mn(2+), Co(2+), Zn(2+), Fe(2+), Mg(2+), and Ca(2+) inhibit the hydrolysis activity of the enzyme whereas EGTA and EDTA do not affect the activity. Optimum pH is 6.5 with beta-cyclodextrin as substrate. Optimum temperature is 85 degrees Celsius with beta-cyclodextrin as substrate. Retains 80% of its activity at 90 degrees Celsius. The half-lives of the enzyme examined at 80, 85, and 90 degrees Celsius are 147, 108, and 23 minutes, respectively. Belongs to the glycosyl hydrolase 13 family.