Abstract
Starch consists of two high molecular mass fractions, amylose and amylopectin, both composed of anhydro glucose units connected to each other by α-glycosidic linkages. In the straight-chain fraction, amylose, there are only α-1,4 linkages, whereas in the branched-chain fraction, amylopectin, short α-1,4 chains are linked to each other by α-1,6 linkages at the branch points. The relative amount of α-1,6 linkages depends on the source of the starch but is approximately 3%–4% in most common starches (Fogarty and Kelly, 1979). α-Amylases (EC 3.2.1.1) hydrolyze α-1,4 linkages in amylose and amylopectin in an endo fashion, producing dextrins and maltooligosaccharides and causing a rapid decrease in the viscosity and iodine-binding capacity of the starch.
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Melasniemi, H. (1993). The α-Amylase-Pullulanase (apu) Gene from Clostridium thermohydrosulfuricum: Nucleotide Sequence and Expression in Escherichia coli . In: Sebald, M. (eds) Genetics and Molecular Biology of Anaerobic Bacteria. Brock/Springer Series in Contemporary Bioscience. Springer, New York, NY. https://doi.org/10.1007/978-1-4615-7087-5_32
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DOI: https://doi.org/10.1007/978-1-4615-7087-5_32
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