Total antioxidant capacity of the Korean diet
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초록
BACKGROUND/OBJECTIVES: The objective of this study was to measure and/or estimate the total antioxidant capacity of theKorean diet. MATERIALS/METHODS: Eighty-one plant foods that were expected to exhibit rather high antioxidant activities were selectedfrom the Korean diet using the Fifth Korean National Health and Nutrition Survey (KNHANES V). These foods were categorizedinto 11 food groups: cereals, potatoes, legumes, nuts, vegetables, kimchies, mushrooms, fruits, fruit juices, sea weeds, andoils. The foods were mixed in the proportions specified in traditional Korean recipes and analyzed. The measured indicatorsfor antioxidant capacities were total phenolics, 2,2-diphenyl-1-picrylhydrazyl (DPPH), oxygen radical absorbance capacity (ORAC),and Trolox equivalent antioxidant capacity (TEAC). RESULTS: Total phenolics were high in the fruit juices, nuts, vegetables, and fruits; and the average DPPH, ORAC, and TEACvalues were high in the vegetables, fruits, fruit juices, and nuts. The correlation coefficient between the content of total phenolicsof each food and the in vitro antioxidant capacity was relatively high at 0.851. The intake of total phenolics per capita perday in the Republic of Korea was estimated to be 127 mg. The total dietary antioxidant capacity (TDAC) values, which wereobtained from the total antioxidant capacity of each food, taking into account the intake of each food, were 20,763, 54,335,and 876.4 μmol of Trolox equivalents using the DPPH, ORAC, and TEAC methods, respectively. The food group that contributedthe most to the Korean TDAC was cereals at 39.7%, followed by fruits and vegetables at 27.8% and 13.9%, respectively. Thecontribution of legumes, nuts, fruit juices, and mushrooms was quite minimal at less than 2% each. CONCLUSIONS: The content of total phenolics and the antioxidant capacity of the Korean diet are significantly correlated andthe high contributing food groups are cereals, fruits, and vegetables.
Abstract
BACKGROUND/OBJECTIVES: The objective of this study was to measure and/or estimate the total antioxidant capacity of theKorean diet. MATERIALS/METHODS: Eighty-one plant foods that were expected to exhibit rather high antioxidant activities were selectedfrom the Korean diet using the Fifth Korean National Health and Nutrition Survey (KNHANES V). These foods were categorizedinto 11 food groups: cereals, potatoes, legumes, nuts, vegetables, kimchies, mushrooms, fruits, fruit juices, sea weeds, andoils. The foods were mixed in the proportions specified in traditional Korean recipes and analyzed. The measured indicatorsfor antioxidant capacities were total phenolics, 2,2-diphenyl-1-picrylhydrazyl (DPPH), oxygen radical absorbance capacity (ORAC),and Trolox equivalent antioxidant capacity (TEAC). RESULTS: Total phenolics were high in the fruit juices, nuts, vegetables, and fruits; and the average DPPH, ORAC, and TEACvalues were high in the vegetables, fruits, fruit juices, and nuts. The correlation coefficient between the content of total phenolicsof each food and the in vitro antioxidant capacity was relatively high at 0.851. The intake of total phenolics per capita perday in the Republic of Korea was estimated to be 127 mg. The total dietary antioxidant capacity (TDAC) values, which wereobtained from the total antioxidant capacity of each food, taking into account the intake of each food, were 20,763, 54,335,and 876.4 μmol of Trolox equivalents using the DPPH, ORAC, and TEAC methods, respectively. The food group that contributedthe most to the Korean TDAC was cereals at 39.7%, followed by fruits and vegetables at 27.8% and 13.9%, respectively. Thecontribution of legumes, nuts, fruit juices, and mushrooms was quite minimal at less than 2% each. CONCLUSIONS: The content of total phenolics and the antioxidant capacity of the Korean diet are significantly correlated andthe high contributing food groups are cereals, fruits, and vegetables.
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