Evidence of native starch degradation with human small intestinal maltase-glucoamylase (recombinant) |
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Authors: | Ao Zihua Quezada-Calvillo Roberto Sim Lyann Nichols Buford L Rose David R Sterchi Erwin E Hamaker Bruce R |
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Institution: | Whistler Center for Carbohydrate Research and Department of Food Science, 745 Agriculture Mall Drive, Purdue University, West Lafayette, IN 47907-2009, USA. |
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Abstract: | Action of human small intestinal brush border carbohydrate digesting enzymes is thought to involve only final hydrolysis reactions of oligosaccharides to monosaccharides. In vitro starch digestibility assays use fungal amyloglucosidase to provide this function. In this study, recombinant N-terminal subunit enzyme of human small intestinal maltase-glucoamylase (rhMGAM-N) was used to explore digestion of native starches from different botanical sources. The susceptibilities to enzyme hydrolysis varied among the starches. The rate and extent of hydrolysis of amylomaize-5 and amylomaize-7 into glucose were greater than for other starches. Such was not observed with fungal amyloglucosidase or pancreatic alpha-amylase. The degradation of native starch granules showed a surface furrowed pattern in random, radial, or tree-like arrangements that differed substantially from the erosion patterns of amyloglucosidase or alpha-amylase. The evidence of raw starch granule degradation with rhMGAM-N indicates that pancreatic alpha-amylase hydrolysis is not a requirement for native starch digestion in the human small intestine. |
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Keywords: | rhMGAM-N recombinant N-terminal subunit of human small intestinal maltase-glucoamylase MGAM maltase-glucoamylase SIM sucrase-isomaltase AMG amyloglucosidase SBD starch binding domain HPAEC high-performance anion-exchange chromatography |
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