Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Changes in nutritional components and antioxidant activities from soybean leaves containing high isoflavone contents according to different storage temperatures and periods

고 이소플라본 함유 콩잎의 저장 온도와 기간에 따른 영양학적 성분과 항산화 활성 변화

  • Lee, Hee Yul (Department of Food Science, Gyeongnam National University of Science and Technology) ;
  • Lee, Dong Hee (Industry Academy Cooperation Foundation, Andong National University) ;
  • Kim, Su Cheol (Department of Food Science, Gyeongnam National University of Science and Technology) ;
  • Cho, Du Yong (Department of Food Science, Gyeongnam National University of Science and Technology) ;
  • Cho, Kye Man (Department of Food Science, Gyeongnam National University of Science and Technology)
  • Received : 2020.08.04
  • Accepted : 2020.10.05
  • Published : 2020.12.31
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Abstract

This study investigated that change of the nutrients (including fatty acids, amino acids, and minerals) and total phenolic (TP), total flavonoid (TF), and isoflavone contents and antioxidant activities during the storage of soybean leaves containing high isoflavone contents at 5, 25, and 55 ℃ for 180 days. The contents of free amino acids were increased from 1313.81 mg/100 g at 0 day to 1776.15, 1693.93 and 1551.18 mg/100 g at 5, 25, and 55 ℃ storage for 180 days, respectively, but the values of fatty acids were little unchanged. The contents of minerals were detected from 51.65 mg/100 g (0 day) to 49.93 (5 ℃), 50.20 (25 ℃), and 61.21 (55 ℃) mg/100 g at 180 days, respectively. The levels of total isoflavones did not change during the storage periods. In case of storage at 55 ℃, the contents of glycosides (1347.78→2195.13 ㎍/g) and aglycones (342.79→480.61 ㎍/g) increased during storage, while the levels of malonylglycosides (2209.22→1289.48 ㎍/g) decreased. Also, the TP and TF contents were slightly increased from 9.31 and 8.61 mg/g at 0 day to 9.97 and 9.3 mg/g at 180 days, corresponding to the radical scavenging activities of 2,2-diphenyl-1-picrydrazyl, 2,4,6-azino-bis (3-ethylbenzthiazoline-6-sulphnoic acid), and hydroxyl increased from 30.91, 55.98 and 23.27% from 37.10, 62.54, and 30.95%, respectively.

본 연구는 고 이소플라본 함유 콩잎을 5, 25 및 55 ℃에서 180일간 저장하면서 지방산, 아미노산, 무기질, 이소플라본, 총 phenolics, 총 flavonoids 및 라디칼 소거활성 변화를 확인하였다. 총 지방산 함량은 저장 기간에 따라 큰 차이를 보이지 않았다. 총 아미노산 함량은 저장 0일에 1313.81 mg/100 g에서 5, 25 및 55 ℃에서 180일째 각각 1776.15, 1693.93 및 1551.18 mg/100 g로 증가하였다. 총 무기질 함량은 저장 초기(51.65 mg/100 g)에 비해 5, 25 및 55 ℃에서 180일째 각각 49.93, 50.20 및 61.21 mg/100 g로 검출되었다. 총 이소플라본 함량은 저장기간 중 비교적 큰 변화가 없었다. 55 ℃에서 180일 저장의 경우, glycosides와 aglycones은 각각 2195.13과 480.61 ㎍/g로 증가하였으며, malonylglycosides는 1289.48 ㎍/g로 감소하였다. 한편, 총 phenolics 및 총 flavonoids 함량은 0일 저장 시료에서 각각 9.31과 8.61 mg/g에서 180일째 각각 9.97과 9.30 mg/g으로 약간 증가하였고, 이에 상응하여 DPPH, ABTS 및 hydroxyl 라디칼 소거활성은 저장 0일째 각각 30.91, 55.98 및 23.27%에서 180일째 37.10, 62.54 및 30.95%로 증가하였다.

Keywords

References

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