Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Low Temperature Storage on Proteolytic and Antioxidant Activities of Fresh Pineapple and Kiwi Juices Extracted by Slow-Speed Masticating Household Juicer

저속압착방식으로 착즙한 파인애플 및 키위 주스의 저온저장 조건에 따른 단백질분해효소 및 항산화 활성

  • Park, Shin-Young (Department of Food and Life Science, Inje University) ;
  • Kim, Min-Ju (Bio-Food Research Center, Hurom Co., Ltd.) ;
  • Park, Ji-In (Department of Food and Life Science, Inje University) ;
  • Kim, Jung-In (Department of Food and Life Science, Inje University) ;
  • Kim, Myo-Jeong (Department of Food and Life Science, Inje University)
  • 박신영 (인제대학교 식품생명과학부) ;
  • 김민주 ((주)휴롬 바이오식품연구소) ;
  • 박지인 (인제대학교 식품생명과학부) ;
  • 김정인 (인제대학교 식품생명과학부) ;
  • 김묘정 (인제대학교 식품생명과학부)
  • Received : 2016.05.04
  • Accepted : 2016.07.20
  • Published : 2016.09.30
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Abstract

The aim of this study was to evaluate proteolytic and antioxidant activities of fresh pineapple and kiwi juices extracted using a slow-speed masticating household juicer during low temperature storage. While over 90% of vitamin C and total polyphenols in both juices were retained after storage for 30 days at $-20^{\circ}C$, reduction of 56.8% for vitamin C and 31.9% for total polyphenols in pineapple juice were detected after storage at $4^{\circ}C$. In the case of kiwi juice, 32.9% of vitamin C and 22.4% of total polyphenols were lost. A high initial content of vitamin C in kiwi juice resulted in a slower reduction rate than that for pineapple juice. A similar result was obtained for 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity. Proteolytic activities of both juices were maintained efficiently with less than 10% loss during storage for 30 days at $-20^{\circ}C$. Protease stability of pineapple juice was better than that of kiwi juice during storage at $4^{\circ}C$, and the same result was obtained when boiled chicken breast was used as a substrate. From these results, when storing pineapple and kiwi juices, which are widely used as a natural meat tenderizer and digestive aid, cold storage at $-20^{\circ}C$ seemed to be more suitable for maintaining antioxidant and proteolytic activities than cold storage at $4^{\circ}C$.

저속압착방식의 주서기를 이용하여 착즙한 파인애플 주스와 키위 주스를 냉장($4^{\circ}C$) 및 냉동온도($-20^{\circ}C$)에서 30일 동안 저장하면서 저장조건이 주스의 항산화 활성 및 단백질 분해효소 활성에 미치는 영향을 확인하였다. 비타민 C 함량 및 총폴리페놀 함량은 파인애플 주스, 키위 주스 모두 냉동저장에서는 30일까지 90% 이상이 유지되었으나 냉장저장에서 비타민 C 함량은 각각 56.8% 및 32.9%, 총폴리페놀 함량은 각각 31.9% 및 22.4%가 감소하였으며, DPPH 라디칼 소거능도 냉동조건보다는 냉장조건에서 활성 감소율이 크게 나타나 유사한 결과를 보였다. 활성 감소율은 초기 비타민 C의 함량이 파인애플 주스보다 1.7배 더 높은 키위주스에서 낮게 나타났다. 파인애플 주스와 키위 주스의 단백질분해효소 활성은 냉동저장 30일까지 모두 초기 활성의 90% 이상으로 높게 유지되었으며 냉장저장 30일 후 파인애플 주스는 초기 활성의 88.4%를 유지하였지만 키위 주스는 초기 효소 활성의 34.5%만이 남아있어 서로 다른 양상을 나타내었다. 이러한 결과는 단백질분해효소 활성을 육안으로 직접 확인하기 위해 진행한 닭 가슴살 단백질분해 활성 측정 결과에서도 확인할 수 있었다. 이상의 결과로부터 천연 연육제 또는 소화보조제로 널리 이용되는 파인애플 및 키위주스의 보관 시 냉장저장보다는 냉동저장이 항산화 활성 및 단백질분해효소 활성의 유지 측면에서 바람직한 것으로 사료된다.

Keywords

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