Abstract
p-Nitrophenyl α-maltotetraosides and α-maltopentaosides having a carboxymethyl group at the nonreducing-end glucosyl group were prepared by the action of Bacillus macerans cyclomaltodextrin glucanotransferase on a mixture of monocarboxymethyl-substituted cyclomaltoheptaose and p-nitrophenyl α- d-glucopyranoside, followed by digestion with glucoamylase, and purification by chromatography. The modes of actions of human pancreatic and salivary α-amylases on these derivatives were studied. The maltopentaoside derivatives were suitable as substrates for assays of α-amylases coupled with glucoamylase and α- d-glucosidase.
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