Abstract
1. A singly branched heptaose produced as a limit dextrin in the digest of beta-limit dextrin with liquefying alpha-amylase [EC 3.2.1.1] of Bacillus amyloliquefaciens was isolated in a paper chromatographically pure state. 2. Analysis using several enzymes revealed that the isolated branched dextrin was a mixture of six singly branched heptaoses with different ramifying points. 3. All the branched heptaoses contained a 62-alpha-maltosylmaltotriose moiety in their molecules, differing only in the mode of attachment of one maltose or two glucose residues by alpha-1,4-glucosidic bonds from this core dextrin. 4. The formation of various singly branched heptaoses (the present paper) and hexaoses (the previous paper) is discussed regarding the attack site specificity of the enzyme on beta-limit dextrin.
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