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Quality changes of dried persimmon based on storage conditions

농가별 저장조건에 따른 건시의 품질 특성 변화

  • Choi, Ji-Young (School of Food Science and Technology, Kyungpook National University) ;
  • Jo, Jeong-Seok (School of Food Science and Technology, Kyungpook National University) ;
  • Lee, Hyeon-Jeong (School of Food Science and Technology, Kyungpook National University) ;
  • Woo, Jin-Ho (School of Food Science and Technology, Kyungpook National University) ;
  • Heo, Su-Hyeon (School of Food Science and Technology, Kyungpook National University) ;
  • Bae, Su-In (School of Food Science and Technology, Kyungpook National University) ;
  • Moon, Kwang-Deog (School of Food Science and Technology, Kyungpook National University)
  • 최지영 (경북대학교 식품공학부 식품생물공학전공) ;
  • 조정석 (경북대학교 식품공학부 식품생물공학전공) ;
  • 이현정 (경북대학교 식품공학부 식품생물공학전공) ;
  • 우진호 (경북대학교 식품공학부 식품생물공학전공) ;
  • 허수현 (경북대학교 식품공학부 식품생물공학전공) ;
  • 배수인 (경북대학교 식품공학부 식품생물공학전공) ;
  • 문광덕 (경북대학교 식품공학부 식품생물공학전공)
  • Received : 2018.01.18
  • Accepted : 2018.02.21
  • Published : 2018.02.28

Abstract

The purpose of this study is to present the results as basic data for establishing proper storage conditions and distribution conditions of actual farms at point of increasing concern about hygiene and palatabiltiy of consumers to food. In this study, three farmhouses of dried persimmons prepared using different storage conditions were selected in Sangju (Korea). The dried persimmons were stored for 90 days. Changes in temperature and humidity were measured with a temperature and humidity recorder under each storage condition, and physicochemical analysis and sensory evaluation were performed. The average temperatures of farmhouse A, B and C were approximately $-22--23^{\circ}C$, $-19--18^{\circ}C$ and $-25^{\circ}C$ respectively. The humidities of A, B and C were 62-63%, 59-60%, and 66-67%, respectively, and the moisture contents of all farmhouses increased during the storage period, with farmhouse B showing the most rapid increase. Free sugars increased, except for those from farmhouse C. Persimmons from farmhouse B showed the greatest changes in chewiness and hardness. The values of $a^*$ and $b^*$ were significantly decreased in persimmons from farmhouse B, and the color difference value of farmhouse B was dramatically increased. Sensory evaluation showed that the color preference tended to decrease compared with the initial value. Only farmhouse B showed decreased overall acceptability. Moreover, farmhouse B had the highest storage temperature and lowest humidity. Therefore, our results showed that storage at a low temperature and high humidity was important for manufacturing high-quality dried persimmons.

본 연구는 저장 조건을 달리 한 농가 3곳의 건시를 저장하면서 품질 특성변화를 비교 및 분석하였다. 건시는 각각 OP, GP, NP로 지칭하였으며 저장된 건시는 30일 간격으로 각 농가의 시료를 취하여 품질 변화를 실험, 분석하였다. 색도의 경우 내부 온습도 변화와 평균 온도가 가장 크고 습도가 가장 낮게 유지된 GP가 가장 유의미한 변화량을 보였다. OOP, IOP, ONP, INP의 변화값에 비해 OGP, IGP는 초기값에서 유의적으로 감소하였다. 색차의 산출결과 색도 변화에서도 OGP는 저장 기간 전체에서 가장 큰 값을 보였으며 IGP의 경우에도 큰 변화가 없는 IOP와 INP에 비해 저장기간 중 점차 색차값이 증가하였다. Glucose함량은 OP와 GP가 함께 증가하는 경향을 보였으며, 그 중 GP가 초기 값에 비해 가장 크게 증가하였다. Fructose함량의 경우도 OP와 GP가 둘 다 증가하는 경향을 보였으며, 저장 60일차 이후에는 큰 변화가 없었다. 조직감의 경우에도 큰 변화가 없는 OP와 NP와는 다르게 GP는 유의적인 차이를 보이며 크게 경화하는 경향을 보였다. 관능 검사의 경우 전반적 기호도, 특히 color항목에서 GP는 지속적으로 감소하는 모습을 보였다. 이상의 결과를 종합하였을 때, 소비자들의 건시에 대한 위생성, 안정성을 보장하고 품질을 향상시켜 기호성을 증대하기 위해서 내부 온습도 변화를 최대한 감소시켜야 하며, 이를 위해 일관성 있는 저장조건을 유지함의 중요함을 알 수 있었다. 향후 실제 농가에서 적합한 건시의 저장 및 유통조건 설정에 도움이 될 것이라고 사료된다.

Keywords

References

  1. Kim JK, Kang WW, Oh SL, Kim JH, Han JH, Moon HK, Choi JU (2004) Comparison of quality characteristics on traditional dried persimmons from various regions. J Korean Soc Food Sci Nutr, 33, 140-145
  2. Kim KH, Kim KM (2014) Food quality comparison of dried persimmons (Diospyros kaki THUNB) when using medicinal plant extracts and food additives during drying process. Curr Res Agric Life Sci, 32, 10-17
  3. Seo JH, Jeong YJ, Kim KS (2000) Physiological characteristics of tannins isolated from astringent persimmon fruits. Korean J Food Sci Technol, 32, 212-217
  4. Kim YB, Lee JS, Lim BS (1995) Survey on utilization of processing and storage the astringent persimmons. Research report of Expansion plan in regard to use the persimmons, gardening research institute, Suwon, Korea, p 15-31
  5. Kim JK, Kim YB, Jang HS (1993) Improved persimmon drying method. Horticultural Experiment Station Research Report, Suwon, Korea, p 344-349
  6. Kim JK, Jang HS, Jung ST, Kim YB (1996) Effect of gas-exchange packaging on quality of dried Persimmons during storage, RDA J Agri Sci, 38, 909-914
  7. Kim HY, Chnag HJ (1995) Changes of physicochemical properties during the preparation of persimmon pickles and its optimal preparation conditions. Korean J Food Sci Technol, 27, 697-702
  8. Park HW, Cha HS, Kim SH, Park HR, Lee SA, Kim YH (2006) Effects of grapefruit seed extract pretreatment and packaging material on quality of dried persimmons. Korean J Food Preserv, 13, 168-173
  9. Park HW, Lee SA, Cha HS, Kim YH (2005) Effect of cinnamon pretreatment and packaging materials on the quality of dried persimmon. Korean J Food Preserv, 12, 305-309
  10. Kim SH, Park HW, Lee SA, Kim YH, Cha HS (2004) Quality changes of dried persimmons depending on pre-treatment and packaging materials during storage. Korean J Food Preserv, 11, 437-440
  11. Park HW, Kim SH, Lee SA, Park JD (2012) Quality change of chill-stored dried persimmons affected by cinnamon extract pre-treatment and packaging condition. Korean J Packag Sci Technol, 18, 9-14
  12. Lee YH (2013) Cultivation of Persimmons-Agricultural Technology Assistant. Rural Development Administration, Jeonju, Korea, p 16
  13. Kim CI (2017) Forestry observation result (astringent persimmons). Korea Rural Economic Institute, 396, 2-3
  14. National Forestry Cooperative Federation (2014) astringent persimmons business development plan, Korea Forest Service, Seoul, Korea, p 4
  15. KREI (2015) Forest Products Production Survey. KREI 11-1400000-000529-13
  16. AOAC (2000) Official Methods of Analysis. 17th ed, Association of official analytical chemists, Washington DC, USA
  17. Im JS, Lee MH (2007) Physicochemical compositions of raw and dried Wolha persimmons. Korean J Food Preserv, 14, 611-616
  18. Lee SA, Park HW, Kim SH, Kim YH (2007) Quality changes of dried persimmons th toe storage temperature and packaging materials. Korean J Packag Sci Tech, 13, 1-4
  19. Lee YH, (2013) Cultivation of persimmons-agricultural technology assistant. Rural Development Administration, Jeonju, Korea, p 228
  20. Oh SR (2002) Development of quality improvement of dried persimmon. Sepecial Lecture Abstract on the 20th Conference, Korea Food Research Institute, Sangju, Korea, p 41-47
  21. Jung KM, Song IK, Cho DH, Chou YD (2004) Quality preperties of semi-dried persimmons with various drying methods and ripeness degree. Korean J Food Preserv, 11, 189-194
  22. Lee YH (2013) Cultivation of persimmons-agricultural technology assistant. Rural Development Administration, Jeonju, Korea, p 223
  23. Kim JK, Kang WW, Oh SL, Kim JH, Han JH, Moon HK, Choi JU (2004) Comparison of quality characteristics on traditional dried persimmons from various regions. J Korean Soc Food Sci Nutr, 33, 140-145
  24. Lee U, Jo DH, Lee MH, Song IK, Huang SI, Lee SH, Choi KS, Heo MS, Kim SY, Jeong KM (2009) Cultivation technique to improve fruit tree production-Walnut & Astringent persimmon. Korea Forest Research Institute Research Book 31, Daejeon, Korea, p 218
  25. Korean Food Science Society (2004) Dictionary of food science and technology. Gwang-il Munhwasa, Seoul, Korea, p 124