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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Quality Changes of Jujube Wine by Hydrostatic Pressure and Freezing Treatment during Storage

초고압 및 냉동처리에 의한 대추술의 저장 중 품질변화

  • Park, Hee-Joeng (High-Tech Agriculture Division, Rural Development Administration) ;
  • Kim, Kwang-Yup (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Jeong, Heon-Sang (Dept. of Food Science and Technology, Chungbuk National University)
  • Published : 2009.01.31
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Abstract

Jujube wine was treated with hydrostatic pressure (500 MPa, 5 min) or freezing ($-20^{\circ}C$, 3 days and thawed $20^{\circ}C$, 4 hr) and their microbial counts, physicochemical properties, and sensory characteristics were investigated during storage at $35^{\circ}C$ for 60 days. Microorganisms in pressure-treated jujube wine were not detected during the whole period and chemical compositions as well as color were slightly changed. Sensory quality was significantly preserved until 20 days without increasing sweet aroma and taste. In freezing-treated wine, bacterial counts were decreased after 10 days and remained below 10 CFU/mL while lactic acid bacteria and yeast were not detected. Changes of chemical composition were smaller than those of the untreated wine but bigger than those of the pressure-treated or heat-treated wine. Instrumental color was changed after $10{\sim}20$ days resulting from the increase of L value and the reduction of a value. Sensory quality was significantly similar with the fresh wine for 10 days, suggesting that pressure treatment would be the most effective sterilization method to improve the shelf life of jujube wine whereas freezing treatment would be insufficient.

가열살균에 의한 대추술의 품질저하를 개선하기 위하여 초고압(500 MPa, 5 min) 및 냉동처리($-20^{\circ}C$에서 3일간 냉동 후 $20^{\cric}C$에서 4시간 동안 해동)를 이용하여 대추술을 살균한 다음 저장 중 품질특성 변화를 조사하였다. 초고압 처리 대추술은 저장기간 동안 미생물이 전혀 검출되지 않았고 성분 및 색도의 변화폭도 가장 작았으며 관능적으로도 단내 및 단맛의 상승을 억제하면서 저장 20일까지 신선한 대추술과 유의적으로 품질이 유사하였다. 냉동처리 대추술에서는 저장 중 효모와 젖산균이 감소하여 저장 10일 후부터 검출되지 않고 세균류만이 10 CFU/mL 이하로 잔존하면서 대조구와 유사한 경향을 보였다. 성분변화는 대조구에 비해서는 소폭이었으나 초고압 처리구, 가열 처리구 및 시판 대추술보다는 컸으며 색도는 적색도와 명도가 낮아지면서 전체적인 변화 폭이 크게 나타났고, 관능적으로는 단내 및 단맛의 상승이 일부 억제되면서 저장 10일까지는 신선한 대추술과 품질이 유의적으로 유사하였다. 이상으로부터 초고압 처리는 대추술의 저장 중 품질을 유지할 수 있는 가장 효과적인 살균방법임을 알 수 있었고, 냉동 처리는 초기 품질에는 영향을 미치지 않았으나 저장 중에는 성분 및 색도에 변화가 나타나면서 초고압 처리에 비하여 저장성은 낮은 것을 알 수 있었다.

Keywords

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