Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Protective effect of Korean diet food groups on lymphocyte DNA damage and contribution of each food group to total dietary antioxidant capacity (TDAC)

한식 식품군의 in vitro 총 항산화능 (TDAC)과 ex vivo DNA 손상 보호효과와의 관련성

  • Lee, Min Young (Dept. of Food & Nutrition, Daedeok Valley Campus, Hannam University) ;
  • Han, Jeong-Hwa (Dept. of Food & Nutrition, Daedeok Valley Campus, Hannam University) ;
  • Kang, Myung-Hee (Dept. of Food & Nutrition, Daedeok Valley Campus, Hannam University)
  • 이민영 (한남대학교 식품영양학과) ;
  • 한정화 (한남대학교 식품영양학과) ;
  • 강명희 (한남대학교 식품영양학과)
  • Received : 2016.09.01
  • Accepted : 2016.10.05
  • Published : 2016.10.31
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Abstract

Purpose: This study was performed to compare total phenolic contents, in vitro antioxidant capacity, and reduction effect of Korean food groups on ex vivo DNA damage in human cells and analyze correlations between each indicator. Methods: Vegetable foods in the Korean diet based the results of the KNHANES V-2 (2011) were classified into 10 food groups: cereals, fruits, vegetables, nuts, kimchi, seaweeds, potatoes, mushrooms, legumes, and oils. Eighty-four foods constituted more than 1% of the total intake in each food group and finally designated as vegetable foods in the Korean diet. Total phenolic content of each food group was measured. Further, in vitro antioxidant capacity was measured based on DPPH radical scavenging assay, TEAC assay, and $ORAC_{ROO{\cdot}}$ assay. Ex vivo DNA damage in human lymphocytes was assessed using comet assay. Results: Total phenolic contents of food groups of the Korean diet increased in the order of mushrooms, fruits, vegetables, seaweeds, and kimchi. Meanwhile, antioxidant rankings of food groups as mean values from the three in vitro test methods increased in the order of mushrooms, seaweeds, vegetables, kimchi, and fruits. Protection against ex vivo DNA damage in human lymphocytes was highest in mushrooms, followed by vegetables, fruits, seaweeds, and kimchi. The rankings of the food groups for total phenolic content, in vitro DAC, and ex vivo DNA protection activity were similar, and correlations between each indicator were significantly high. Conclusion: Mushrooms, fruits, vegetables, and seaweeds among the tested food groups in the Korean diet showed high total phenolic contents, in vitro antioxidant capacities, and protection against DNA damage. Correlations between each indicator in terms of total phenolic content, in vitro antioxidant capacity, and ex vivo DNA protection between each food group were found to be particularly high.

본 연구는 제5기 2차년도 국민건강영양조사 결과를 활용하여 한식 식품군의 총 페놀 함량, in vitro 항산화활성 및 인체세포를 이용한 ex vivo DNA 손상 감소효과를 비교하고, 각 지표간의 상관성을 분석하며, 한식의 총 식사 항산화능에 대한 각 식품군의 기여도를 알아보기 위해 수행되었다. 제5기 2차년도 국민건강영양조사 결과를 바탕으로 한식의 식물성 식품을 10가지 식품군 (곡류, 과일류, 채소류, 견과류, 김치류, 해조류, 감자류, 버섯류, 두류, 오일류)으로 분류한 후 각 식품군별로 총 섭취량의 1% 이상 섭취한 식품 84종을 한식의 식물성 식품으로 최종 선정하였다. 각 식품군의 총 페놀함량을 측정하였고, DPPH radical scavenging assay, TEAC assay, $ORAC_{ROO{\cdot}}$ assay를 사용하여 in vitro 항산화능을 측정하였다. 한식의 식품군별 항산화능 (dietary antioxidant capacity, DAC)은 in vitro 항산화활성 평균값과 각 식품군의 1일 섭취량을 고려하여 계산하였고 한식 TDAC는 각 식품군의 DAC로의 합으로 구하였으며, TDAC에 대한 각 식품군 항산화능의 기여도를 평가하였다. 인체 임파구에서의 ex vivo DNA 손상 정도는 comet assay를 사용하여 평가하였다. 한식 식품군의 총 페놀함량은 버섯류, 과일류, 채소류, 해조류, 김치류 등의 순으로 높았으며, 3가지 in vitro 실험법을 평균한 식품군의 항산화활성 순위는 버섯류, 해조류, 채소류, 김치류, 과일류 등의 순이었다. 각 식품군의 항산화활성에 식품섭취량을 고려하여 계산한 한식의 TDAC에 대한 식품군의 항산화능 기여도는 곡류가 33.4%로 가장 높았으며, 과일류 (23.9%), 채소류 (12.7%), 김치류 (11.2%) 등의 순으로 나타났다. 인체 임파구에서 ex vivo DNA 손상 보호효과는 버섯류에서 가장 높았으며, 그 다음 채소류, 과일류, 해조류, 김치류의 순으로 나타났다. 각 식품군의 페놀함량과 in vitro 항산화 활성, 그리고 ex vivo DNA 보호효과의 순위가 비슷하게 나타났으며 각 지표간의 상관성은 매우 높았다. 한식 식품군 중 버섯류, 과일류, 채소류, 해조류에서 총 페놀함량과 항산화 활성, DNA 손상 보호효과가 높게 나타났다. 각 식품군의 총 페놀함량과 in vitro 항산화 활성, ex vivo DNA 보호효과 지표 간의 상관성은 매우 높았다. 한식의 TDAC에 대한 식품군별 항산화능 기여도는 곡류가 가장 높았고, 그 다음이 과일류, 채소류, 김치류의 순이었다. 이러한 결과는 앞으로 한식의 우수성을 항산화 측면에서 밝히는데 매우 중요한 기초자료로 활용될 수 있을 것이다.

Keywords

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