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Effects of Different Drying Methods on Fatty Acids, Free Amino Acids, and Browning of Dried Alaska Pollack

명태건조방법에 따른 갈변화 관련 물질의 변화

  • Choi, Hee-Sun (Food Science Institute, School of Food and Life Science, Inje University) ;
  • Kim, Jong-Hwan (Food Science Institute, School of Food and Life Science, Inje University) ;
  • Kim, Jae-Cherl (Food Science Institute, School of Food and Life Science, Inje University)
  • 최희선 (인제대학교 식품과학연구소, 식품생명과학부) ;
  • 김종환 (인제대학교 식품과학연구소, 식품생명과학부) ;
  • 김재철 (인제대학교 식품과학연구소, 식품생명과학부)
  • Published : 2007.09.30

Abstract

Changes in composition of fatty acids and free amino acids in three differently dried Alaska pollack (sun dried, naturally cyclic freeze-thaw dried, and 1-year-aged cyclic freeze-thaw dried Alaska pollack (Hwangtae)) were investigated to correlate them with browning reactions in drying and aging Alaska pollack. Major fatty acids of the sun dried Alaska pollack were palmitic acid, oleic acid, and eicosapentaenoic acid (EPA), and those in the Hwangtae were palmitic acid, oleic acid, and gondoic acid. Hwangtae showed the lowest amount of polyunsaturated fatty acids among the three types of dried Alaska pollack. Free amino acids content of sun dried Alaska pollack was higher than that of the cyclic freeze-thaw dried Alaska pollack and Hwangtae. Lesser amount of histidine in Hwangtae (0.02%) than that in the cyclic freeze-thaw dried Alaska pollack (0.087%) may indicate the degradation of histidine due to the browning reaction in aging the cyclic freeze-thaw dried Alaska pollack. Significant changes in compositions of fatty acids and free amino acids among the dried products revealed the browning reaction resulted from carbonyl compounds produced by decomposition of lipid hydroperoxides and free amino acids. Aging the cyclic freeze-thaw dried Alaska pollack for a year contributed to the development of browning.

건조된 명태들은 전반적으로 다가불포화지방산이 감소하고 단일불포화지방산은 증가하는 경향을 보였다. 특히 주기적인 자연냉동과 해동을 반복하면서 건조된 명태(미숙성황태)를 장기간 숙성하여 완성한 황태의 지방산 조성은 북어나 미숙성황태와 비교해 볼 때, 원료시료(명태)간의 차이를 감안하더라도 특징적인 차이를 보였다. 총 유리아미노산 함량도 황태가 북어나 미숙성황태보다 낮게 나타나 불포화지방산과 유리아미노산의 반응에 의한 점진적인 갈변화 현상을 설명해 주는 것으로 판단된다. 황태의 수용성 갈변물질은 주로 숙성단계에서 많이 형성되는 것으로 추정되었다.

Keywords

References

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