Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Establishment of Konjac Manufacturing Process and Optimum Storage Conditions at Room Temperature

곤약의 제조공정 및 최적 저장조건 확립

  • Lee, Nan-Hee (Dept. of Medi-food HMR industry, Daegu Hanny University) ;
  • Choi, Ung-Kyu (Dept. of Food Science & Technology, Korea National University of Transportation)
  • 이난희 (대구한의대학교 메디푸드 HMR산업학과) ;
  • 최웅규 (한국교통대학교 식품공학과)
  • Received : 2020.03.09
  • Accepted : 2020.04.14
  • Published : 2020.04.30
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Abstract

The manufacturing process for konjac jelly is largely divided into the three processes of powder manufacturing, a coagulation and finishing. It was found that the number of aerobic bacteria in konjac jelly decreases as the concentration of coagulation agent and soaking liquid increases. The temperature of the water has no significant effect. When the concentration of coagulation agent was maintained at 1.0%, the tensile strength was also maintained without significant change for up to 10 months. When the concentration was kept below 0.8%, however, the tensile strength showed a tendency to sharply decrease. After fixing the coagulant concentration to 1.0%, the effect by the soaking liquid was confirmed. At all concentrations of soaking, it was found that both tensile strength and bacterial numbers are unchanged until 10 months of storage.

곤약의 제조 공정은 크게 분말제조과정, 응고과정 및 제성과정으로 나눌 수 있었다. 곤약의 일반세균수는 응고제와 침지액의 농도가 높아질수록 뚜렷한 감소 경향을 나타낸 반면 용수의 온도는 유의미한 영향을 미치지 못하였다. 곤약의 저장성 실험에서 응고제[Ca(OH)2] 농도를 1.0%로 유지할 경우 인장강도는 10개월까지 큰 변화 없이 유지되는 것으로 나타났으나 0.8% 이하로 유지할 경우 급격한 감소를 나타내는 경향을 보였다. 일반세균수도 인장강도의 변화와 유사한 패턴을 보였다. 응고제 농도를 1.0%로 고정한 후 침지액에 의한 영향을 확인한 결과 시험된 모든 침지액 농도(4×10-3-1.2×10-2 N)에서 인장강도와 일반세균수 모두 저장 10개월까지 큰 변화없이 유지되는 것으로 나타났다. 이는 곤약의 저장시 응고제의 농도가 결정적 영향을 미치는 것을 의미하는 것으로 상온에서 응고제의 농도를 1.0% 이상 유지할 경우 침지액의 농도에 상관없이 상온에서 10개월 동안 물성을 유지할 수 있다는 것을 의미한다.

Keywords

References

  1. Kishida, N., Relationship between the quality of konjac flour and the molecular matter nature of konjac-mannan. Agr. Biol. Chem., 43, 2391-2397 (1979). https://doi.org/10.1271/bbb1961.43.2391
  2. Yoo, M.H., Lee, H.G., Lim S.T., Physical properties of the films prepared with glucomannan extracted from Amorphophallus konjac. Korean J. Food Sci. Technol., 29, 255-260 (1997).
  3. Bark, S.J., Kang, M.H., The dietary effect of patty made with added glucomannan in high fat diet-induced obese rats. J. East Asian Soc. Diet Life, 15, 40-48 (2005).
  4. Bark, S.J., Kang, M.H., The effect of dietary noodle with glucomannan on the weight loss in high fat diet-induced obese rats. J. Korean Soc. Food Sci. Nutr., 32, 893-898 (2003). https://doi.org/10.3746/jkfn.2003.32.6.893
  5. Kim, S.J., Choi, W.S., You, S.G., Min, Y.S., Effect of glucomannan on quality and shelf-life of low-fat chicken patty. Korean J. Food Sci. Technol., 39, 55-60 (2007).
  6. Choi, S.H., Kim, S.M., Quality properties of giant squid (Dosidicus gigas) surimi-based product manufactured with Amorphophallus konjac flour. Korean J. Food Sci. Technol., 44, 422-427 (2012). https://doi.org/10.9721/KJFST.2012.44.4.422
  7. Choi, H.E., Park, H.Y., Jo, Y.I., Kim, N.Y., Lee, N.H., Choi, U.K., Effect on the characteristics of noodle by the addition of konjac powder. Korean J. Food Nutr., 30, 282-289 (2017). https://doi.org/10.9799/ksfan.2017.30.2.282
  8. Choi, H.E., Park, H.Y., Kim, N.Y., Jang, H.S., Lee, N.H., Choi, U.K., Cooking characteristics of noodle containing konjac powder and Capsosiphon fulvescens. Korean J. Food Nutr., 30, 847-851 (2017). https://doi.org/10.9799/ksfan.2017.30.4.847
  9. Sim, J.I., Choi, S.J., Jeong, J.H., Choi, U.K., Selection of the coagulant for processing and identification of antibacterial activity on food-born pathogens of konjac jelly. Korean J. Food Nutr., 27, 699-705 (2014). https://doi.org/10.9799/ksfan.2014.27.4.699
  10. Sim, J.I., Choi, S.J., Jeong, J.H., Choi, U.K., Establishment of optimum condition for the coagulation and antimicrobial activity of konjac jelly. Korean J. Food Nutr., 29, 415-420 (2014).
  11. Lee, N.H., Choi, W.S., Choi, U.K., Optimization for the antibacterial activity of konjak jelly using evolutionary operation-factorial design technique. Korean J. Food Nutr., 31, 272-277 (2018). https://doi.org/10.9799/KSFAN.2018.31.2.272
  12. Choi, UK., Enhancement of konjac storage by controlling pH of coagulant and soaking liquid. J. Food Hyg. Saf., 34, 100-105 (2019). https://doi.org/10.13103/JFHS.2019.34.1.100
  13. Ministry of Food and Drug Safety, (2019, April 3). Korean Food. Code. Chapter 9. General analytical method. 9-3-3.5-9-3-3.25. Retrieved from http://www.foodsafetykorea.go.kr/portal/safefoodlife/food/foodRvlv/foodRvlv.do
  14. Liman, L., Thomas, J., Herald, Donghai Wang, Jeff, D., Wilson, Scott R., Bean, Fadi M., Aramouni., Characterization of sorghum grain and evaluation of sorghum flour in a Chinese egg noodle system. J. Cereal Sci., 55, 31-36 (2012). https://doi.org/10.1016/j.jcs.2011.09.007
  15. Kim, S.J., Preparation and characteristics of konjac noodleadded mugwort. J. East Asian Soc. Dietaty Life, 23, 613-619 (2013).
  16. Lee, N.H., Choi, W.S., Choi, U.K., Optimization for the antibacterial activity of konjak jelly using evolutionary operation-factorial design technique. Korean J. Food Nutr., 31, 272-277 (2018). https://doi.org/10.9799/KSFAN.2018.31.2.272