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 -20oC and 5oC, respectively. Steam blanching and osmotic dehydration with ascorbic acid reduced ΔE 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.

Abstract
 서 론
 재료 및 방법
  재료
  전처리 방법
  Drip loss
  냉동 및 해동
  색도
  물성
  pH, 산도, Brix
  수분함량
  Total polyphenol contents
  DPPH radical scavenging activity
  ABTS radical scavenging activity
  통계 처리
 결과 및 고찰
  전처리 방법에 따른 복숭아의 수분함량 변화
  전처리 방법에 따른 냉해동 복숭아의 색도 변화
  전처리 방법에 따른 냉해동 복숭아의 물성 변화
  전처리 방법에 따른 냉해동 복숭아의 drip loss, pH, 산도,Brix 변화
  전처리 방법에 따른 냉해동 복숭아 총 페놀함량 및 항산화활성 변화
 요 약
 References

• 박종진(농촌진흥청 국립농업과학원 농식품자원부) | Jong Jin Park (Department of AgroFood Resources, National Institute of Agricultural Science, Rural Development Administration)
• 손영란(농촌진흥청 국립농업과학원 농식품자원부)
• 김경미(농촌진흥청 국립농업과학원 농식품자원부) | Kyung Mi Kim (Department of AgroFood Resources, National Institute of Agricultural Science, Rural Development Administration)
• 조용식(농촌진흥청 국립농업과학원 농식품자원부) | Yong Sik Cho (Department of AgroFood Resources, National Institute of Agricultural Science, Rural Development Administration)
• 김하윤(농촌진흥청 국립농업과학원 농식품자원부) | Ha Yun Kim (Department of AgroFood Resources, National Institute of Agricultural Science, Rural Development Administration) Corresponding author