Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Recrystallization Characteristics of Solar Salt After Removing of Bittern and Impurities

간수와 불순물을 제거시킨 천일염의 재 결정화 특성

  • Lee, Ye-Kyung (Dept. of Food Science and Technology, Food Industrial Technology, Catholic University of Daegu) ;
  • Kim, Soon-Dong (Dept. of Food Science and Technology, Food Industrial Technology, Catholic University of Daegu)
  • 이예경 (대구가톨릭대학교 식품외식산업학부 식품공학) ;
  • 김순동 (대구가톨릭대학교 식품외식산업학부 식품공학)
  • Published : 2008.02.29
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Abstract

Recrystallization characteristics of salt after removing bittern and impurities from solar salt (SD) were investigated. To remove the bittern, the SD was treated at 30, 40 and $50^{\circ}C$ under 95% humidity. 86% of the bittern was removed when the SD was kept at $30^{\circ}C$ for three weeks. Total amount of impurity in SD was 6.94% (w/w) with organic impurity (5.58%) and inorganic impurity (1.36%). Most organic impurities (89%) were soluble. When the SD was roasted at $350^{\circ}C$ for 40 minutes, 90.14% of the soluble organic impurities were removed; however, the removable organic impurity was reduced, when the SD roasted for 50 minutes at $350^{\circ}C$. L* value decreased while a* and b* values increased when the SD was roasted until 40 minutes at $350^{\circ}C$. In contrast, L* value increased while a*, b* values decreased with SD roasted over 50 minutes at $350^{\circ}C$. The size of recrystallized pure salt was positively correlated to temperature and depth of salt solution, while the crystallization time was negatively correlated to temperature and salinity. Yield of recrystallized salt was negatively correlated to temperature. Overall acceptability tended to increase at low crystallization temperature and high salinity.

천일염에 함유된 간수와 불순물의 제거와 재결정화 특성을 조사하였다. 간수제거를 위하여 습도 95%로 온도별(30, 40, $50^{\circ}C$)로 처리한 결과 $30^{\circ}C$에서 3주간 둠으로써 간수성분의 86%가 제거되었다. 천일염에 함유된 불순물의 총량은 6.94%(w/w)였으며, 유기태가 5.58%, 무기태가 1.36%이었고, 유기태 불순물은 89%가 가용성이었다. 수용성의 유기태 불순물은 천일염을 $350^{\circ}C$에서 40분간 볶음 처리함으로써 90.14%가 침전, 제거되었으나 50분간 볶음 처리한 경우는 침전량이 감소되었다. 소금의 색상은 볶음 40분까지는 L*값은 감소한 반면 a*, b*값은 증가하였으나 50분간 볶음에서는 이와 반대의 경향을 나타내었다. 간수와 불순물을 제거시킨 천일염을 온도별, 염도별, 소금물의 깊이별로 재결정화시킨 결과 결정의 크기는 온도가 높을수록 커지고 낮아지면 작아지는 경향이었으며 소금물의 깊이가 깊어짐에 따라 컸다. 결정화시간은 온도가 높을수록 염도가 높을수록 단축되었으며 소금결정의 수율은 온도가 높을수록 낮았다. 종합적 기호도는 결정화 온도가 낮고 소금농도가 높은 경우에 높아지는 경향을 보였다.

Keywords

References

  1. Beak HY. 1987. A study on nutrition of salt. Korean J Soc Food Cookery Sci 3: 92-106
  2. Fujino, Yasuhiko. 1999. Living science of table salt in human ecology-common salt, health and environment. J East Asian Soc Dietary Life 9: 230-244
  3. Kim YS. 1999. The application method of bamboo salt and health in the pollution period. J East Asian Dietary Life 9: 257-260
  4. Kim DH, Lee SB, Rhim JH. 2004. Characteristics of seaweed salts prepared with seaweeds. Korean J Food Sci Technol 36: 937-942
  5. Kim DH, Rhim JW, Lee SB. 2003. Characteristics of seaweed salts prepared with seaweeds. Korean J Food Sci Technol 35: 62-66
  6. Moon DS, Kim HJ, Shin PK, Jung DH. 2005. Characteristics of chemical contents of horizontal spray salts from deep ocean water. J Kor Fish Soc 38: 65-69
  7. Kim GY, Jung JH, Kim SK, Cho JE, Lee JM. 2004. The effects of endurance exercise and chitosan salt on blood pressure in normotensive rats. Korean J Exercise Nutr 8: 199-206
  8. Lee WJ. 1999. Salt and hypertension. J East Asian Dietary Life 9: 378-385
  9. Shin Hy, Na HJ, Moon PD, Seo SW, Shin TY, Hong SH, See KN, Park RK, Kim HM. 2004. Biological activity of bamboo salt. Food Ind Nutr 9: 36-45
  10. Park MW, Park YK. 1998. Changes in physicochemical and sensory characteristics of Oiji (Korean pickled cucumber) prepared with different salts. J Korean Soc Food Sci Nutr 27: 419-424
  11. Kim KM, Kim JG, Kim JS, Kim WJ. 2004. Effects of heating temperature and time salt and pH on the texture and color characteristics of whole egg gel. Korean J Food Nutr 17: 163-170
  12. Kim DH, Yang SE, Rhim JW. 2003. Fermentation characteristics of Kochujang prepared with various salts. Korean J Food Sci Technol 35: 671-679
  13. Kim MH, Kim SD, Kim KS. 2000. Effect of salting conditions on the fermentation and quality of dandelion (Taraxacum platycarpum D.) kimchi. Korean J Food Sci Technol 32: 1142-1148
  14. Park JW, Kim SJ, Kim SH, Kim BH, Kang SG, Nam SH, Jung ST. 2000. Determination of mineral and heavy metal contents of various salts. Korean J Food Sci Technol 32: 1442-1445
  15. Heo OS, Oh SH, Shin HS, Kim MR. 2005. Mineral and heavy metal contents of salt and salted-fermented shrimp. Korean J Food Sci Technol 37: 519-524
  16. Hwang SH. 1988. A study on the heavy metal contents of common salts in Korea. Kor J Env Hith Soc 14: 73-86
  17. Hong KT, Lee JY, Jang BK. 1996. Heavy metal contents of marketing salts and bay salts by heating. Korean J Sanitation 11: 79-84
  18. Ha JO, Park KY. 1998. Comparison mineral contents and external structure of various salts. J Korean Soc Food Sci Nutr 27: 413-418
  19. Lee KK. Preparation of magnesium oxide containing salt and bitter taste components. Korean Patent 10-2004-0086458
  20. Yang KY, Kim HD, Lee CS. 1985. The effect of cooling surface on the crystallization kinetics in a Cmsmprcrystallizer. Abstract of '85 Annual Meeting in Autumn of Korean Institute of Chem Eng F-22: 289-290
  21. Kim SD, Lee YK. 2007. Preparation method of clean salts removed impurity and bitter taste components. Korean Patent 2007-0039182
  22. Meilgaard M, Civille GV, Carr BT. 1987. Sensory evaluation techniques. CRC Press, Inc., Boca Raton, Florida, USA. p39-112
  23. Klitzke S, Lang F. 2007. A method for the determination of hydrophobicity of suspended soil colloids. Colloids and Surfaces A: Physicochem Eng Aspects 303: 249-252 https://doi.org/10.1016/j.colsurfa.2007.04.014
  24. Hong SH. 2005. A natural colored mineral salt and its manufacturing method. Korean Patent 10-2005-0073163
  25. Han JS. 1999. Effect of salt on cooking. J East Asian Dietary Life 9: 391-401

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