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Effect of addition of sweet potato on physiochemical properties of Kochujang

고구마를 이용한 고추장의 숙성 중 이화학적 특성 변화

  • Park, Su-Ah (Department of Food and Nutrition, Mokpo National University) ;
  • Kim, Dong-Han (Department of Food and Nutrition, Mokpo National University)
  • 박수아 (목포대학교 식품영양학과) ;
  • 김동한 (목포대학교 식품영양학과)
  • Received : 2016.04.08
  • Accepted : 2016.05.16
  • Published : 2016.08.30

Abstract

Kochujang was prepared by replacement of rice (25%, control) with pumpkin or purple sweet potato by 0. 5, 10, and 15% (total addition ratio of rice and sweet potato=25% of sample). Effects of the addition of sweet potato on physiochemical properties of fermented Kochujang were investigated. Viable cells of yeast decreased in the sweet potato-added Kochujang at the later stage of fermentation, while there was no significant difference in the number of bacteria among the test groups. As the addition ratio sweet potato increased, ${\alpha}$-amylase activity increased while protease activity decreased. Hunter L, a, and b values of Kochujang prepared with purple sweet potato were lower than those with pumpkin sweet potato. Changes in ${\Delta}E$ value was greater in Kochujang prepared with pumpkin sweet potato than that with purple sweet potato. Oxidation-reduction potential and water activity were higher in sweet potato-Kochujang than control, but reducing sugar content was higher in control. Alcohol and amino-type nitrogen contents were higher in Kochujang prepared with pumpkin sweet potato than that with purple sweet potato, but it was not significant. Overall sensory acceptability was highest in Kochujang prepared with 10% of purple sweet potato while that with 15% pumpkin sweet potato was the least preferred.

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