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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Blanching Effect on Quality Characteristics and Antioxidant Activities in Yacon Soaked in Doenjang Sauce

데침에 따른 야콘 된장절임의 항산화 활성 및 품질 변화

  • Kim, Gi-Chang (Dept. of Agro-Food Resources, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Hye-Sun (Dept. of Agro-Food Resources, National Academy of Agricultural Science, Rural Development Administration) ;
  • Jo, In-Hee (Dept. of Agro-Food Resources, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Kyung-Mi (Dept. of Agro-Food Resources, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Jin-Sook (Dept. of Agro-Food Resources, National Academy of Agricultural Science, Rural Development Administration)
  • 김기창 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 김혜선 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 조인희 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 김경미 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 김진숙 (농촌진흥청 국립농업과학원 농식품자원부)
  • Received : 2012.03.21
  • Accepted : 2012.04.27
  • Published : 2012.07.31
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Abstract

The objective of this study was to investigate the quality characteristics of blanched and non-blanched yacon (Smallanthus sonchifolius) soaked in Doenjang sauce. The yacon was treated by blanching ($100^{\circ}C$, 4 min), then soaked in Doenjang sauce at $20^{\circ}C$. The pH and total acidity of blanched yacon were not changed significantly after 42 days of soaking. But, the pH and total acidity of non-blanched yacon were rapidly increased and decreased, respectively. The salinity of blanched yacon was higher than that of non-blanched yacon until 35 days. Also, the $Brix^{\circ}$ of blanched yacon was higher than that of non-blanched yacon from 7 days to 35 days. Textural properties of both non-blanched and blanched yacon showed that hardness increased until 21 days but decreased afterwards. The total polyphenol contents of non-blanched yacon decreased after 14 days, but blanched yacon remained constant. The DPPH radical scavenging activity of both blanched and non-blanched yacon decreased gradually as aging continued in the Doenjang sauce. There were no significant differences in sensory characteristics between blanched and non-blanched yacon soaked in Doenjang sauce.

본 연구는 가공식품으로 활용도가 낮은 야콘을 이용하여 저장성을 높인 절임식품을 제조하는 과정 중 데침의 전처리가 최종 제품의 품질에 미치는 영향을 조사하였다. 야콘의 데침 전처리를 달리하여 된장소스에 절인 야콘의 pH는 전반적으로 절인 기간이 증가할수록 감소하는 경향을 보였으나 14일 이후 급격한 감소를 보인 데치지 않은 야콘에 비해 데친 야콘은 5.3~5.5의 수준을 유지하였다. 총산도 역시 기간이 지날수록 두 시료 모두 증가하는 경향을 보였으나 데친 야콘의 경우 데치지 않은 것보다 증가폭이 적었다. 이는 데침의 전처리가 야콘 절임제품의 산과 관련된 품질에 있어 변질을 제어할 수 있는 유용한 방법으로 생각되었다. 염도와 당도의 경우 데침 전처리를 거친 야콘이 데치지 않은 것에 비해 숙성기간 중 더 높은 값을 보였다. 야콘의 chlorogenic, ferulic, caffeic acid와 같은 항산화 능력이 있는 폴리페놀계 물질의 함량을 측정하기 위해 유기용매로 추출하여 분석한 결과 데친 야콘은 숙성기간이 경과하여도 유의적인 변화를 보이지 않았다. 이 결과는 데침의 전처리가 야콘 절임제품 가공 시 항산화력과 관련 깊은 폴리페놀 함량의 유지에 효과적인 것으로 판단되며 구체적인 기작과 최적조건의 설정을 위해서 추가적인 연구가 필요할 것으로 보인다. 된장소스에서 숙성기간에 따른 야콘의 조직감 측정을 위한 hardness는 데침 전처리와 관계없이 모두 21일째 가장 높은 값을 보였으며 이후 감소하는 경향을 보였다. 관능검사는 모든 평가항목에서 두 시료간의 유의적인 차이를 보이지 않아 데침의 열처리가 관능적 품질에 영향을 미치지 않는 것으로 생각된다. 위의 결과를 토대로 항산화 활성을 갖는 야콘의 데침 전처리는 된장소스에 절임 중 폴리페놀 함량과 품질을 유지할 수 있는 효과적인 가공법으로 이용될 수 있을 것으로 생각된다.

Keywords

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