In this study, domestic soybean cultivars were extracted using water, 70% ethanol, and 100% ethanol. The contents of polyphenols, flavonoids, and antioxidant activities of these extracts were measured. For the water extracts, the polyphenol content was significantly higher in the Daewon cultivar compared to the others. Ethanol extracts contained lower levels than the water extracts, and, unlike the water extracts, there was no significant difference between the cultivars. The flavonoid content in the Jinpung cultivar was the highest among the water extracts, and this content was greater in the water extract than in the ethanol extract. In terms of ABTS radical scavenging activity, Daewon and Taekwang exhibited significantly higher activity in the water extracts. The Jinpung cultivar showed the highest activity in the 70% ethanol extract, which was slightly lower than that of the water extract. DPPH radical scavenging activity was found to be higher in Taekwang than in the other cultivars. In the 70% ethanol extract, Taekwang demonstrated high antioxidant activity, similar to that of the water extract. A correlation analysis of antioxidant components and antioxidant activity in soybean cultivars revealed the highest r value of 0.9326 between the contents of flavonoid compounds and polyphenol compounds.

Abstract
서 론
재료 및 방법
    1. 실험재료
    2. 용매별 추출물의 제조
    3. Polyphenol 화합물의 함량
    4. Flavonoid 화합물의 함량
    5. DPPH radical 소거능
    6. ABTS radical 소거능
    7. 통계처리
결과 및 고찰
    1. Polyphenol 화합물의 함량
    2. Flavonoid 화합물의 함량
    3. ABTS 라디칼 소거능
    4. DPPH 라디칼 소거능
요약 및 결론
감사의글
References

• 이경행(한국교통대학교 식품영양학 전공 교수) | Kyung-Haeng Lee (Professor, Major in Food and Nutrition, Korea National University of Transportation, Chungbuk 27909, Korea) Corresponding author