Quality Characteristics of Cheonan Shingo Pear and Freeze-dried Pear Snack

천안 신고배의 품질 특성 및 이를 이용한 동결건조 배 스낵 제품 개발

  • Received : 2012.01.28
  • Accepted : 2012.05.30
  • Published : 2012.06.30


The evaluated physicochemical and sensory properties of freeze-dried Shingo pears(Pyus pyritolia Niitaka), cultivated at Cheonan city, prepared using different sugar concentration of blanching solution we evaluated. Sliced Shingo pears(5 mm and 7 mm thickness) were blanched in sugar solution(0, 3, 5, 7, 10%) and freeze-dried to make dried fruits snack. The firmness of the pear snack sliced in 7 mm portions was greater than the pear snacks sliced in 5mm pieces. However in sensory evaluation, pear snacks sliced in 5 mm portions showed higher scores. pH and titratable acidity showed no significant difference in the blanching process. Concentration of total phenollic compound in fresh pear was 3.7 mg% but freeze-dried pear snacks showed higher values at 15 mg%. Sensory evaluation tests showed that the scores for texture decreased as the thickness of the snack and sugar concentration of blanching solution increased; however the score increased(p<0.05). Color intensity and overall acceptability scores were highest in pear snacks sliced in 7 mm pieces and blanched with 7% sugar solution.




  1. Lee KS, Park KH, Lee SH, Choe EO, Lee HG 2003b. The quality properties of dried carrots as affected by blanching and drying methods during storage. Korean J Food Sci Technol 35:1086-1092
  2. Lenart A. 1996. Osmo-convective drying of fruits and vegetables: Technology and application. Dry Technol 14:391-413
  3. Mandala IG, Anagnostaras EF, Oikonomou CK. 2005. Influence of osmotic dehydration conditions on apple airdrying kinetics and their quality characteristics. J Food Eng 69:307-316
  4. Park YO, Choi JH, Choi JJ, Yim SH, Lee HC, Yoo MJ. 2011. Physicochemical characteristics of yanggaeng with pear juice and dried pear powder added. Korean J Food Preserv 18:692-699
  5. Tanrioven D, Eksi A. 2005. Phenolic compounds in pear juice from different cultivars. Food Chem 93:89-93
  6. Yang YJ. 2002. Edible coating effects on storage life of 'Niikata' pear. J Korean Academic Industrial Society 3:216-220
  7. Zhang YB, Bae MJ, An BJ, Choi HJ, Bae JH, Kim S, Choi C. 2003. Effect of antioxidant activity and change in quality of chemical composition and polyphenol compound during longterm storage. Korean J Food Sci Technol 35:115-120
  8. AOAC. Official Methods Analysis. 14th ed. 1984. Association of Official Analytical Chemists, Washington, DC. USA
  9. Choi HD, Lee HC, Kim YS, Choi IW, Park YK, Seog HM. 2008. Effect of combined osmotic dehydration and hot-air drying on the quality of dried apple products. Korean J Food Sci Technol 40:36-41
  10. Choi HS, Li X, Kim WS, Lee Y. 2010. Comparison of fruit quality and antioxidant compound of 'Niitaka' pear trees grown in the organically and conventionally managed systems. Korean J Environ Agric 29:367-373
  11. Choi OJ, Park HR, Chough SH. 1998. Variation of free sugar and amino acid contents of pears during the ripening period. Korean J Soc Food Sci 14:250-254
  12. Doymaz I. 2005. Sun drying of figs: an experimental study. J Food Engin 71:403-407
  13. Franck C, Lammertyn J, Ho QT, Verboven P, Verlinden B, Nicolai BM. 2007. Browning disorders in pear fruit. Postharvest Biology Technol 43:1-13
  14. Hwang IG, Koan SW, Kim TM, Kim DJ, Yang MH, Jeong HS. 2006. Change of physicochemical characteristics of Korean pear(Pyrus pyrifolia Nakai) juice with heat treatment conditions. Korean J Food Sci Technol 38:342-347
  15. Jeong ST, Kong MH, Yeo SW, Choi JH, Choi HS, Han GJ. 2010. Studies on the mixture wine processing using omija and pear. J East Asian Soc Dietary Life 20:896-902
  16. Kim GC, Lee SY, Kim KM, Kim Y, Kim JS, Kim HR. 2011 Quality characteristics of hot-air and freeze dried apples slices after osmotic dehydration. Korean Soc Food Sci Nutr 40:848-852
  17. Kim JG, Jeong ST, Jang HS, Kim YB. 1997. Quality properties of dried melon with different pretreatment. Korean J Post-Harvest Sci Technol Agri Products 4:147-153
  18. Kim MJ, Kim JH, Oh HK, Chang MJ, Kim SH. 2007. Seasonal variation of mineral nutrients in Korean common fruits and vegetables: Examining water, protein, lipid, ascorbic acid, and ${\beta}$-carotene contents. Korean J Food Cookery Sci 23: 423-432
  19. Lee JW, Kim SH, Hong SI, Jeong MC, Park HW, Kim DM. 2003a. Quality distribution of Korean Shingo pears. Korean J Food Preserv 10:162-168
  20. Lee KS, Park HM, Hong JS, Lee GH, Oh MJ. 2009. Changes of chemical components during fermentation of pear wine. Korean J Food Preserv 16:991-998

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