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  • Unexpected high digestion rate of cooked starch by the Ct-maltase-glucoamylase small intestine mucosal α-glucosidase subunit.

    Author(s) : Lin, A. H. M.Nichols, B. L.Quezada-Calvillo, R.Avery, S. E.Sim, L.Rose, D. R.Naim, H. Y.Hamaker, B. R.

    Author Affiliation : Whistler Center for Carbohydrate Research, Department of Food Science, Purdue University, West Lafayette, Indiana, USA.

    Author Email : hamakerb@purdue.edu

    Journal article : PLoS ONE 2012 Vol.7 No.5 pp.e35473 ref.49

    Abstract : For starch digestion to glucoseglucoseSubject Category: Chemicals and Chemical Groups
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    , two luminal α-amylases and four gut mucosal α-glucosidase subunits are employed. The aim of this research was to investigate, for the first time, direct digestion capability of individual mucosal α-glucosidases on cooked (gelatinized) starch. Gelatinized normal maize starchmaize starchSubject Category: Commodities and Products
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    maize starchSubject Category: Chemicals and Chemical Groups
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    was digested with N- and C-terminal subunits of recombinant mammalian maltase-glucoamylase (MGAM) and sucrase-isomaltase (SI) of varying amounts and digestion periods. Without the aid of α-amylase, Ct-MGAM demonstrated an unexpected rapid and high digestion degree near 80%, while other subunits showed 20 to 30% digestion. These findings suggest that Ct-MGAM assists α-amylase in digesting starch molecules and potentially may compensate for developmental or pathological amylase deficiencies.

    ISSN : 1932-6203

    DOI : 10.1371/journal.pone.0035473

    Record Number : 20123225368

    Publisher : Public Library of Sciences (PLoS)

    Location of publication : San Francisco

    Country of publication : USA

    Language of text : English

    Indexing terms for this abstract:

    Organism descriptor(s) : Zea mayszea maysSubject Category: Organism Names
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    Descriptor(s) : alpha-amylasealpha-amylaseSubject Category: Chemicals and Chemical Groups
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    , alpha-glucosidasealpha-glucosidaseSubject Category: Chemicals and Chemical Groups
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    , glucoseglucoseSubject Category: Chemicals and Chemical Groups
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    , maizemaizeSubject Category: Commodities and Products
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    , maize starchmaize starchSubject Category: Chemicals and Chemical Groups
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    , small intestinesmall intestineSubject Category: Anatomical and Morphological Structures
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    , starchstarchSubject Category: Chemicals and Chemical Groups
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    Identifier(s) : alpha-D-glucosidase, corn, corn starch, dextrose, maltase

    Broader term(s) : ZeazeaSubject Category: Organism Names
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    , PoaceaepoaceaeSubject Category: Organism Names
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    , PoalespoalesSubject Category: Organism Names
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    , commelinidscommelinidsSubject Category: Organism Names
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    , monocotyledonsmonocotyledonsSubject Category: Organism Names
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    , angiospermsangiospermsSubject Category: Organism Names
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    , SpermatophytaspermatophytaSubject Category: Organism Names
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    , plantsplantsSubject Category: Organism Names
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    , eukaryoteseukaryotesSubject Category: Organism Names
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