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Physicochemical Properties and Antioxidant Activities in Infrared Dried Peach Processed by Different Pretreatment

전처리조건에 따른 적외선건조 복숭아의 이화학적 특성 및 항산화효과

  • Kim, Jae-Won (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Youn, Kwang-Sup (Department of Food Science and Technology, Catholic University of Daegu)
  • 김재원 (대구가톨릭대학교 식품가공학전공) ;
  • 윤광섭 (대구가톨릭대학교 식품가공학전공)
  • Received : 2012.08.08
  • Accepted : 2012.10.06
  • Published : 2012.12.30

Abstract

This study was conducted to determine the effects of the pretreatment and infrared drying methods on the physicochemical properties and antioxidant activities of dried peaches. The pretreatment methods were the 30 min treatment of NaCl, vitamin C, and soluble Ca (1:5 w/v immersion ratio), and leaving them untreated before infrared drying at $55^{\circ}C$ for 20 hr. The moisture content was lower in the pre-treated group and was significantly lowest in the 0.3% NaCl. The titratable acidity and soluble solid content and acid ratio (SS/TA) were high for the vitamin C and soluble Ca groups. The browning degree and cutting strength of the dried peach were lower in the pre-treated group. The total sugar content in the 0.3% NaCl group was significantly higher than those in the vitamin C and soluble Ca groups. The Ca contents were more effective in the soluble Ca treated group and increased with higher Ca concentration. The sensory evaluation results indicated that the organoleptic scores for the overall preference were higher in the 0.1% vitamin C treated group. The phenolic compounds and ABTS radical scavenging ability were high for the 0.1% vitamin C and 0.1% soluble Ca treated groups. These results suggest that pretreatment affected the qualities of the dried peaches, showing that infrared drying can be applied to the production of high quality dried peach products.

Acknowledgement

Supported by : 중소기업청

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