Improved Functional Properties of Potato Starch through Simultaneous Heat-moisture Treatment and Conjugation with Lysine and Fatty Acylated Saccharide by the Maillard Reaction

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  • Kohyama Noriki
    R & D Center, Nippon Meat Packers Inc.
  • Soga Naomi
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • Ohashi Satoko
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • Hattori Makoto
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • Yoshida Tadashi
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • Hasegawa Takanori
    R & D Center, Nippon Meat Packers Inc.
  • Oishi Yasuyuki
    R & D Center, Nippon Meat Packers Inc.
  • Morimatsu Fumiki
    R & D Center, Nippon Meat Packers Inc.
  • Takahashi Koji
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology

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説明

Potato starch (PS), L (+)-lysine hydrochloride (Lys) and glucose/fructose stearic acid monoester (GE/FE) were conjugated by autoclaving them by heat-moisture treatment (HMT) and the Maillard reaction to prepare PS-Lys-GE/FE conjugate with a molar ratio of PS (as glucose residues) : Lys : GE/FE=684 : 1.0 : 0.66. PS-Lys-GE/FE exhibited increased thermal stability in terms of significantly higher gelatinization temperature, lower gelatinization enthalpy, lower solubility than those of native and control PSs. It maintained the state of swollen granules without collapse, even if heated at 110°C for 30 min. In addition, gelatinized PS-Lys-GE/FE exhibited resistance to digestibility with α-amylase and easy vaporization of water, similar that of free water. Addition of PS-Lys-GE/FE markedly reduced the peak viscosity and breakdown values of wheat flour batter. Simultaneous modification through HMT and the Maillard reaction resulting in conjugation of PS with GE/FE through Lys could provide a conjugated starch material with unique properties in terms of the elevated gelatinization temperature, reduced solubility, swelling and digestibility, easy water vaporization, high thermal resistance, and reduced viscosity of wheat flour batter.

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