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Effect of Pretreatments on the Physicochemical Properties of Lotus Root Powder

전처리 방법에 따른 연근가루의 이화학적 특성

  • Kim, Ok-Suk (Department of Food & Cooking Science, Sunchon National University) ;
  • Choi, Ok-Ja (Department of Food & Cooking Science, Sunchon National University) ;
  • Shim, Ki-Hoon (Department of Food & Cooking Science, Sunchon National University)
  • Received : 2011.08.30
  • Accepted : 2011.12.30
  • Published : 2012.02.28

Abstract

To enhance the application of lotus roots and to provide basic data for processed foods with lotus roots, lotus root powder was processed under four different conditions, and their physicochemical properties were analyzed as follows. In the Hunter's color value results, the salted sample had the highest L value, and the vinegared sample had the highest a and b values. The water-holding capacities of the salted, vinegared, and blanched samples were higher than that of the control sample. The amylase contents were in the 19.57-20.43% range but were not significant. The swelling power and solubility of the processed samples increased as the temperature rose. The blanched sample had the highest swelling power and solubility (65 and $60^{\circ}C$, respectively). The crystallinity of the processed samples, as determined via X-ray diffraction, reached their peak at $16.9^{\circ}$, and the other peaks at 14.6, 22.2, and $23.8^{\circ}$ were typical of the B type. In addition, the relative crystallinity, gelatinization temperature, and enthalpy, as determined via DSC thermogram, were highest in the vinegared sample and lowest in the blanched sample. In the amylogram results, the vinegared sample had the highest maximum viscosity and breakdown. The retrogradation of the vinegared sample was the slowest as its setback value was the lowest.

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