Food Engineering Progress (산업식품공학)

Korean Society for Industrial Food Engineering (한국산업식품공학회)
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Effects of Various Pretreatments on Quality Attributes of Frozen and Thawed Peaches

전처리 방법에 따른 냉동 복숭아의 품질 특성

  • Park, Jong Jin (Department of AgroFood Resources, National Institute of Agricultural Science, Rural Development Administration) ;
  • Park, Ji Hyun (Department of AgroFood Resources, National Institute of Agricultural Science, Rural Development Administration) ;
  • Kim, Kyung Mi (Department of AgroFood Resources, National Institute of Agricultural Science, Rural Development Administration) ;
  • Cho, Yong Sik (Department of AgroFood Resources, National Institute of Agricultural Science, Rural Development Administration) ;
  • Kim, Ha Yun (Department of AgroFood Resources, National Institute of Agricultural Science, Rural Development Administration)
  • 박종진 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 손영란 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 김경미 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 조용식 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 김하윤 (농촌진흥청 국립농업과학원 농식품자원부)
  • Received : 2018.08.27
  • Accepted : 2018.10.30
  • Published : 2018.11.30
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Abstract

The aim of this study was to investigate the effect of pretreatments on quality of frozen peach. Pretreatments including steam blanching, water blanching, high pressure, and osmotic dehydration were applied to two varieties (Daeokgye and Hwangdo). Pretreated peaches were frozen and thawed at $-20^{\circ}C$ and $5^{\circ}C$, respectively. Steam blanching and osmotic dehydration with ascorbic acid reduced ${\Delta}E$ values without change of pH and acidity. Osmotic dehydration with sucrose decreased drip loss and increased brix. Freezing/thawing resulted in an increase of maximum force, while maximum force decreased with increasing time of steam and water blanching. Furthermore, osmotic dehydration with calcium chloride increased maximum force. High pressure decreased maximum force of Daeokgye and increased that of Hwangdo compared with non-treatment. Total polyphenol content, DPPH radical scavenging activity, and ABTS radical scavenging activity were improved by pretreatment including steam blanching, blanching, and osmotic dehydration with ascorbic acid.

본 연구에서는 품종 및 전처리방법에 따른 복숭아의 냉해동 특성을 비교하였다. 전처리 없이 냉해동한 대옥계와 황도는 변색과 maximum force 증가, 드립로스 발생 현상을 보였는데, 이러한 문제점들은 전처리 방법에 의해 개선할 수 있었다. 전처리 직후 냉동 전에 전처리 별로 수분함량을 비교했을 때 sucrose를 포함한 삼투건조 시 수분이 감소하였으며 이는 해동 후 drip loss 감소에 영향을 주었다. 변색과 성분 및 항산화능력의 감소는 SB 3분 이상, ascorbic acid를 포함한 삼투건조 시 크게 개선되었다. Maximum force는 steam blanching, water blanching 시간이 증가할수록 감소하였으며, ACS의 경우 다른 삼투건조 처리구에 비해 높은 값을 보였다. 두 품종 모두 sucrose를 포함한 삼투건조 시 Brix가 크게 증가하였으며 pH와 산도는 품종 별로 차이는 있었으나 전처리 방법에 따라서는 큰 차이가 없었다. 물성 및 색도, 드립로스 등으로 판단하였을 때 steam blanching 3분 처리구가 전처리 조건 중 가장 적절한 방법으로 생각된다.

Keywords

Acknowledgement

Supported by : 농촌진흥청

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