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Prevention of quality deterioration of concentrated blueberry juice by means of pH regulators during thermal treatment

pH 조절제를 이용한 농축 블루베리주스 열처리 시 품질저하억제

  • Lee, In Gyeong (Department of Food Engineering, Dankook University) ;
  • Min, Seo Cheol (Department of Food Science and Technology, Seoul Women's University) ;
  • Kim, Hee Sun (National Academy of Agricultural Science, Rural Development Administration) ;
  • Han, Gwi Jung (National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Myung Hwan (Department of Food Engineering, Dankook University)
  • 이인경 (단국대학교 식품공학과) ;
  • 민세철 (서울여자대학교 식품공학과) ;
  • 김희선 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 한귀정 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 김명환 (단국대학교 식품공학과)
  • Received : 2016.06.17
  • Accepted : 2016.07.21
  • Published : 2016.10.31

Abstract

This study was conducted to minimize the quality degradation of concentrated blueberry juice after $90^{\circ}C$ treatment for 5 min by means of citric acid (CA) and acidic sodium metaphosphate (ASM) as pH modifiers. The highest anthocyanin content was observed at 1% CA+1% ASM (65.747 mg per 100 g) followed by 1% CA (46.022 mg per 100 g) and control (30.864 mg per 100 g). The DPPH radical scavenging activities of 1% CA+1% ASM, 1% CA and control were 87.338, 75.486 and 67.983% in respectively. The elastase inhibitory activity at 1% CA+1% ASM, 1% CA and in the control was 87.338, 75.486 and 67.983%, and the tyrosinase inhibitory of these samples were 77.891, 67.598 and 26.375%, respectively. Anthocyanin contents, DPPH radical scavenging, elastase inhibitory and tyrosinase inhibitory activities were significantly different (p<0.05) between the 1% CA+1% ASM treatment and control. During the heat treatment, quality degradation of concentrated blueberry juice was reduced by the 1% CA+1% ASM treatment, as expected for new acidulants.

본 연구는 농축 블루베리주스를 제조 시 구연산(CA) 또는 산성메타인산나트륨(ASM)을 산미료로써 이용하여 열처리과정에서 블루베리의 폴리페놀과 안토사이아닌과 같은 기능성 성분농도와 산화방지활성, elastase 억제활성 및 tyrosinase 억제활성 등의 저하를 최소화시키는데 있다. 열처리한 농축 블루베리주스의 색가는 1% CA+1% ASM 처리군이 54.672로 가장 높았고, 1% CA 처리군이 33.034, 대조군이 22.083의 순으로 나타났다. 총 안토사이아닌 함량에서도 1% CA+1% ASM 처리군이 65.747 mg/100 g, 1% CA 처리군, 대조군 순으로 각각 46.022, 30.864 mg/100 g으로 나타났다. 산화방지활성으로써 DPPH radical 소거능의 경우 대조군은 67.983%, 1% CA 처리군은 75.486%, 1% CA+1% ASM 처리군은 87.338%로 나타났다. Elastase 억제활성에서는 대조군, 1% CA, 1% CA+1% ASM 처리군의 결과 값은 각각 26.063, 26.336, 28.285%로 나타났다. Tyrosinase 억제활성에서는 대조군 26.375%, 1% CA 처리군 67.598%, 1% CA+1% ASM 처리군은 77.891% 순으로 높게 나타났다. 모든 분석 치에서 대조군과 1% CA+1% ASM 처리군 간에는 5% 내에서 유의성 차이가 있었다. 본 결과를 통해 ASM처리가 열처리과정에서 기능성성분과 생리활성의 저하를 억제하여주는 역할을 하는 것으로 나타났으며 새로운 산미료로서 활용할 수 있을 것으로 기대한다.

Keywords

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