Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Changes in Quality Parameters of Tomatoes Harvested at Different Mature Stages during Storage

수확시의 숙도에 따른 저온저장 중 토마토의 품질인자의 변화

  • Choi, Jeong Hee (Food Distribution Research Group, Korea Food Research Institute) ;
  • Jeong, Moon Cheol (Food Distribution Research Group, Korea Food Research Institute) ;
  • Kim, Dongman (Food Distribution Research Group, Korea Food Research Institute)
  • 최정희 (한국식품연구원 유통시스템연구단) ;
  • 정문철 (한국식품연구원 유통시스템연구단) ;
  • 김동만 (한국식품연구원 유통시스템연구단)
  • Received : 2012.11.06
  • Accepted : 2013.04.10
  • Published : 2013.04.30
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Abstract

This study was conducted to investigate the effect of mature stages on quality of Rafito tomatoes (Lycopersicon esculentum Mill.) during storage at low temperature. Tomatoes grown in greenhouse were harvested at three different mature stages (turning, pink, and red), packaged with a 30-${\mu}m$-thick polyethylene film, and then stored at 5 and $10^{\circ}C$, respectively. The changes in firmness, soluble solids content (SSC), titratable acidity (TA), colour, lycopene content, decay, and chilling injury were measured on a weekly basis. After three weeks of storage, chilling injury and decay were found to have individually occurred at 5 and $10^{\circ}C$, respectively. As there was little change in quality at $5^{\circ}C$, it was concluded that red tomatoes could maintain their good quality for two weeks. The normal postharvest ripening was inhibited in the turning and pink tomatoes during storage at $5^{\circ}C$. The turning and pink tomatoes showed improved quality after two-week storage at $10^{\circ}C$. In particular, the turning fruits showed the highest firmness throughout the storage period. Furthermore, the red colour, SSC/TA, and lycopene content of the turning fruits reached the same levels as with the red fruits after two-week storage at $10^{\circ}C$. These results suggest that red tomatoes should be stored at $5^{\circ}C$ to inhibit decay, and that the optimum temperature for early-harvested tomato (turning and pink) is $10^{\circ}C$ for the ripening process after harvest.

본 연구에서는 수확시 숙성 정도가 토마토의 저장 중 품질변화에 미치는 영향을 구명하고자 하였다. 그린하우스에서 재배된 'Rafito' 품종을 각각 turning, pink, red 단계에 수확한 후 $30{\mu}m$ PE 필름으로 포장한 후 $5^{\circ}C$와 $10^{\circ}C$에 두어 1주일 간격으로 경도, 가용성 고형분 함량, 적정산도, 색, 라이코펜 함량, 부패율, 저온장해율을 조사하였다. 저장 3주 이후에 $5^{\circ}C$에서는 저온장해가 $10^{\circ}C$에서는 부패가 높게 발생되었다. $5^{\circ}C$에서는 수확 후 품질변화가 거의 없으므로 완숙과인 red 토마토의 품질 유지에 적합하였나, turning과 pink 토마토는 수확후 숙성과정이 억제되어 저장 2주 후에도 미숙한 상태에 머물렀다. Turning과 pink 토마토를 수확 후 $10^{\circ}C$에 저장하면 수확기에 비해 품질이 향상되었다. 특히, turning 토마토는 $10^{\circ}C$에 2주간 저장할 경우 연화는 억제되어 경도가 높게 유지되면서도, 착색이 완성되고 SSC/TA가 증가하며 라이코펜 함량이 완숙과 수준으로 증가되어 내 외부 품질이 가장 우수하였다. 따라서 red 단계에서 수확된 'Rafito' 토마토의 경우 부패를 억제할 수 있는 $5^{\circ}C$ 저장이 바람직하며, red 단계보다 미숙한 상태에서 수확할 경우 저온에서는 후숙에 의한 품질형성이 억제되므로 $10^{\circ}C$가 적정 온도인 것으로 판단된다.

Keywords

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