Effects of Freeze-Drying Time on Quality of Freeze-Dried Kimchi

동결건조 시간이 동결건조김치의 품질에 미치는 영향

  • Ko, Young-Tae (Department of Foods and Nutrition, Duksung Women's University) ;
  • Kang, Jung-Hwa (Department of Foods and Nutrition, Duksung Women's University)
  • 고영태 (덕성여자대학교 식품영양학과) ;
  • 강정화 (덕성여자대학교 식품영양학과)
  • Published : 2002.02.01

Abstract

Effects of freeze-drying time on the microbiological, sensory, and other characteristics of freeze-dried kimchi were investigated to optimize freeze-drying time for kimchi. Quality attributes of freeze-dried kimchi, including number of lactic acid bacteria (LAB), pH, sensory properties, brittleness, rehydration property, moisture content, and microstructure of Chinese cabbage were observed for 24, 48 and 72 h, respectively. Number of LAB and pH of the kimchi freeze-dried for 24 h were significantly changed in comparison with those of the kimchi not freeze-dried. However, further freeze-drying did not change markedly number of LAB and pH. Overall acceptability of the sample freeze-dried for 48 of 72 h was better than that of the sample freeze-dried for 24 h. As freeze-drying time increased, brittleness of the dried sample increased, and rehydration property was improved while dried weight and moisture content of the sample decreased. In conclusion, the sample freeze-dried for 48 h was better than the sample freeze-dried for 24 or 72 h, based on sensory properties and other characteristics.

Keywords

kimchi;freeze-drying

References

  1. Jo, J.S. Studies on Kimchi, pp. 261-339. Yurim-munhwasa, Seoul (2000)
  2. Yun, S.I. Method to increase preservation of kimchi by addition of cinnamon oil. Korean Patent 1002 (1990)
  3. Chung, D.K. and Yu, R. Antimicrobial activity of bamboo leaves extract on microorganisms related to kimchi fermentation. Kor. J. Food Sci. Technol. 27: 1035-1038 (1995)
  4. Kim, K.O., Moon, H.A. and Jeon, D.W. The effect of low molec ular weight chitosans on the characteristics of kimchi during fer-mentation. Kor. J. Food Sci. Technol. 27: 420-427(1995)
  5. Ko, Y.T. and Lee, E.J. Freeze drying of lactic acid bacteria fer-merited food prepared from egg white powder and casein supple-merited with growth stimulating agent. Kor. J. Food Sci. Technol. 31: 1337-1344 (1999)
  6. Kim, M.H. and Chang, M.J. Influence of organic acid or ester addition on kimchi fermentation. Foods and Biotechnol. 4: 146-149 (1995)
  7. Son, Y.M., Kim, K.O., Jeon, D.W. and Kyung, K.H, The effect of low molecular chitosan with or without other preservatives on the characteristics of kimchi during fermentation. Kor. J. Food Sci. Technol. 28: 888-896 (1996)
  8. Jandel Co. SigmaStat for Windows. V 1.02, Jandel Co., USA (1994)
  9. Lee, S.H., Choi, W.J. and Im, Y.S. Effect of Scizandra chinensis (Omija) extract on the fermentation of kimchi. Kor. J. Appl. Microbiol. Biotechnol. 25: 229-234 (1997)
  10. AOAC Official Methods of Analysis, 15th ed., 934.06, Moisture in dried fruits, Association of Official Analytical Chemists, Wash-ington, DC, USA (1990)
  11. Kim, S.J. and Park, K.H. Retardation of kimchi fermentation by the extracts of Allium tuberosum and growth inhibition of related microorganisms. Kor. J. Food Sci. Technol. 27: 813-818 (1995)
  12. Sun Scientific Co., User's Manual of Rheometer Model Compac-100, Sun Scientific Co., Tokyo, Japan (1999)
  13. Larmond, E. Laboratory methods for sensory evaluation of food, Canada Department of Agriculture, Ottawa, Canada (1977)
  14. Byun, M.W. and Kwon, J.H. Method of long term storage of Chinese cabbage kimchi. Korean Patent 5282 (1991)
  15. Ryu, H.J., Chung, C.H. and Kyung, K.H. Evaluation of nisin as a preservative to prevent over-acidiScation of kimchi. Food Sci. Biotechnol. 7: 205-208 (1998)
  16. Ahn, S.C. and Lee. G.J. Effects of salt-fermented fish and chito-san addition on the pectic substance and the texture changes of kimchi during fermentation. Kor. J. Soc. Food Sci. 11: 309-315 (1995)
  17. Lee, C.Y., Kim, H.S. and Chun, J.K. Studies on the manufacture of canned kimchi. J. Kor. Agri. Chem. Soc. 10: 33-38 (1968)
  18. Ko, Y.T, Kang, J.H. and Kim, T.E. Quality of Freeze Dried Kim-chi. Kor. J. Food Sci. Technol. 33: 100-106 (2001)
  19. Choi, S.Y, Lee, I.S., Yoo, J.Y., Chung, K.S. and Koo, Y.J. Inhibi tory effect of nisin upon kimchi fermentation. Kor. J. Appl. Microbiol. Biotechnol. 18: 620-623 (1990)
  20. Kim, C.S., Kim, J.H. and Jung, M.H. Method of preparation of kimchi can. Korean Patent 850 (1966)
  21. Lee, N.J. and Chun, J.K. Studies on the kimchi pasteurization. Part II. Effects of kimchi pasteurization conditions on the shelf-life of kimchi. J. Kor. Agri. Chem. Soc. 25: 197-200 (1982)
  22. Park, K.H., Seo, B.C., Han, J.S. and Na, S.I. Method to prolong ripening of kimchi by addition of glucono-delta-lactone. Korean Patent 3501 (1993)
  23. Cha, B.S., Kim, W.J., Byun, M.W., Kwon, J.H. and Cho, H.O. Evaluation of gamma irradation for extending the shelf life of kimchi. Kor. J. Pood Sci. Technol. 21: 109-119 (1989)
  24. Byun, M.W., Cha, B.S. Kwon, J.H., Cho, H.O. and Kim, W.J. The combined effect of heat treatment and irradiation on the inactivation of major lactic acid bacteria associated with kimchi fermentation. Kor. J. Food Sci. Technol. 21: 185-191(1989)
  25. Park, K.H., An, S.Y. and Yook, C. Method to prevent detedora-tion of kimchi by pre-heat treatment. Korean Patent 22 (1987)
  26. An, D.J., Lew, K.C. and Lee, K.P. Effects of adipic acid and stor-age temperature on extending the shelf-life of kimchi. Food Sci. Biotechnol. 8: 78-82 (1999)
  27. Moon, K.D., Byun, J.A., Kim, S.J. and Han, D.S. Screening of natural preservatives to inhibit kimchi fermentation. Kor. J. Food Sci. Technol. 27: 257-263 (1995)