Chemical Changes of Low Salt Gulbi (salted and dried yellow corvenia) during Hot-air Drying with Different Temperatures

저염 굴비 제조 시 열풍건조 온도에 따른 화학적 특성 변화

  • Gwak, Hyun-Jung (Department of Food Science and Technology and Institute of Agricultural Science and Technology, Chonnam National University) ;
  • Eun, Jong-Bang (Department of Food Science and Technology and Institute of Agricultural Science and Technology, Chonnam National University)
  • 곽현정 (전남대학교 식품공학과.농업과학기술연구소) ;
  • 은종방 (전남대학교 식품공학과.농업과학기술연구소)
  • Received : 2009.09.11
  • Accepted : 2009.12.17
  • Published : 2010.04.30

Abstract

Gulbi, made of fresh yellow corvenia (Psendosciaena manchurica) that has been salted and dried, is one of the most popular traditional marine foods in Korea. The objective of this study was to develop a method to safely manufacture Gulbi with low levels of oxidation and contamination, by a hot air drying method. Changes in total acidity, pH, salt concentration, thiobarbituric acid-reactive substance (TBARS) and volatile basic nitrogen (VBN) were measured during drying at 30, 35 and $40^{\circ}C$ for 15 days in a hot air-dryer using a semi-dried method. Acidity increased with increasing drying time at all drying temperatures. The pH decreased gradually with increasing drying time. Salt concentration was increased as drying time increased at all drying temperatures due to moisture loss. The VBN increased as drying time increased for all drying temperatures. Data indicate that the drying at $35^{\circ}C$ appears to have a significant sensory and physicochemical advantage in Gulbi products.

열풍건조 온도를 달리한 생조기와 냉동조기의 내장의 유무에 따른 각각의 처리구별로 건조 온도를 달리하여(30, 35, $40^{\circ}C$) 건조기간 동안 화학적 품질 특성에 대해 알아보았다. 산도, pH, 염농도, 휘발성 염기질소, TBARS를 분석한 결과를 요약하면 다음과 같다. 일반적인 전통굴비의 염도는 22-23%정도를 나타내는데 본 연구에서 30, $35^{\circ}C$에서 건조하여 제조한 굴비의 염도는 17-20% 정도로 염도가 더 낮아 저염 굴비의 제조 가능성을 보였다. 또한 $35^{\circ}C$ 건조 처리구의 염도가 $40^{\circ}C$ 건조 처리구에 비해 2-4% 이상 낮은 염도를 나타내어 저염 굴비를 제조하는데 적합한 온도로 결정 할 수 있었다. VBN 함량에서는 30, 35, $40^{\circ}C$ 건조에서 유의적인 차이를 보이지는 않았으나 건조 시간이 경과함에 따라 VBN의 수치가 점차 증가하는 것을 볼 수 있었으며, 이는 굴비의 건조중 변패가 많이 일어난 것으로 여겨진다. 그 외 TBARS 함량 역시 건조기간이 경과할수록 점차 증가하는 경향을 보였으나 제품의 내장 유무에 대한 산패도 측정결과에서는 유의적인 차이는 없었다. 결론적으로, 전통적인 굴비 제조 방법에 비해 $35^{\circ}C$에서 15일 동안 건조 하는 것이 품질이 우수한 저염굴비를 빠르게 제조할 수 있을 것으로 생각되며 물리적 특성 및 관능적 특성에 대한 연구가 필요하다고 생각된다.

Keywords

References

  1. Ro RH. Changes in lipid components of salted-dried Yellow corvenia during processing and storage. J. Korean Fish Soc. 21: 217-224 (1988)
  2. Hong YH. Studies on improving gulbi processing technology and changes in flavor and nutrients of Pseudosciaena manchurica (yellow corvenia). Chonnam National University, Gwangju, Korea. pp. 1-53 (1987)
  3. Shin JH, Kwon OC, Kang MJ, Choi SY, Lee SJ. The changes of malonaldehyde and fatty acids composition of yellow corvenia during gulbi processing and storage. Korean J. Food Sci. Technol. 19: 374-380 (2006)
  4. Eun JB, Lee JC, Chung DO. Chemical changes of low salt-dried yellow corvenia muscle during frozen storage. J. Korean Fish Soc. 30: 660-666 (1997)
  5. Shin MJ, Kim JM. Effect of garlic and onion juice on fatty acid compositions and lipid oxidation in gulbi (salted and semi-dried yellow croaker). J. Korean Soc. Food Sci. Nutr. 33: 1337-1342 (2004) https://doi.org/10.3746/jkfn.2004.33.8.1337
  6. Yang HC, Chung HJ. Changes of microbial and chemical components in salt-fermented youbsak during the fermentation. Korean J. Food Sci. Technol. 21: 838-844 (1995)
  7. Shin DH, Kim DH, Choi U, Lim DK, Lim MS. Studies on the physicochemical characteristic of traditional kochujang. Korean J. Food Sci. Technol. 28: 157-161 (1996)
  8. Lee KD, Choi CR, Cho JY, Kim HL, Ham KS. Physicochemical and sensory properties of salt-fermented shrimp prepared with various salts. J. Korean Soc. Food Sci. Nutr. 37: 53-59 (2008) https://doi.org/10.3746/jkfn.2008.37.1.53
  9. Shon J, Haque ZU. Antioxidative ability of native and thermized sour whey in oxidation-catalysed model systems. Int. J. Dairy Technol. 60: 143-148 (2007) https://doi.org/10.1111/j.1471-0307.2007.00320.x
  10. Kim MH, Kim MK, Yu MS, Song YB, Seo WJ, Song KB. Dehydration of sliced ginger using maltodextrin and comparison with hot-air dried and freeze-dried ginger. Korean J. Food Sci. Technol. 41: 146-150 (2009)
  11. Cho HS, Park BH. Effect of onion and garlic juice on the lipid oxidation and quality characteristics during the storage of congereel (Astroconger myriaster). Korean J. Food Sci. Technol. 16: 135-142 (2000)
  12. Lee EH, Oh KS, Ahn CB, Lee TH, Chung YH. Processing conditions and quality stability of seasoned sardine chopped-meat during frozen storage. J Korean Fish Soc. 20: 191-201 (1987)
  13. Ha JO, Park KY. Comparison of antioxidation rate and comutagenic effect of different kinds of salt. J. Korean Assoc. Cancer Preven. 4: 44-51 (1999)
  14. Ha JH, Song DJ, Kim PH, Heu MS, Cho ML, Sim HD, Kim HS Kim JS. Changes in food components of top shell, Omphalius pfeifferi capenteri by thermal processing at high temperature. J Korean Fish Soc. 35: 166-172 (2002)
  15. Cha WS, Kim CK, Kim YS. On the chemical analysis of amino acid of yellow corvenia. J. Korean Biotechnol. Bioeng. 4: 157-161 (1989)
  16. Kim HJ. Shelf-life extension of Korean native beef using ultraviolet irradiation. MS thesis, Chonnam National University, Gwangju, Korea (2006)
  17. Demeyer D, Hoozaee J, Meadom H. Specificity of lipolysis during dry sausage ripening. J. Food Sci. 39: 293-296 (1974) https://doi.org/10.1111/j.1365-2621.1974.tb02878.x
  18. Park YH, Song E, Shin MS, Jhon DY, Hong YH. Studies on the changes of lipid constituents during gulbi processing. Korean J. Food Sci. Technol. 18: 485-491 (1986)