The aim of this study was to compare the antioxidant activities and functional contents of Korean conventional and Chinese seed gingers from the Jeollabuk-do Wanju and Chungcheongnam-do Seosan regions. Ginger samples were subjected to steaming treatments for different durations (2–8 h) at 121oC using an autoclave. The antioxidant activity was evaluated by measuring total polyphenol and flavonoid contents and ABTS and DPPH radical scavenging activities, while functional ingredient contents were analyzed for gingerols and shogaols. The results showed that Wanju conventional seed ginger (WO-2) had the highest total polyphenol (85.24 mg GAE/g) and flavonoid (98.14 RE/100 g) contents, surpassing that of the control in all steamed groups at 6 h. ABTS radical scavenging activity showed a strong correlation with total polyphenol and flavonoid contents. The control groups indicated that Korean conventional seed ginger had 1.0–1.3 times higher gingerol contents compared to Chinese seed ginger. Furthermore, the content of shogaols, considered major functional ingredients, increased significantly with longer steaming durations, reaching the highest content (1,793 mg/kg) at 8 h, which was 1.0–1.8 times higher in Korean conventional seed ginger than that in Chinese seed ginger. These experiments provide valuable data supporting the excellence of Korean conventional seed ginger in the future.

ABSTRACT
Materials and Methods
    생강재료
    증숙 처리
    수분함량
    항산화 활성 측정을 위한 시료 전처리
    총 페놀 화합물 및 총 플라보노이드 함량 측정
    DPPH 라디칼 소거능 측정
    ABTS 라디칼 소거능 측정
    Gingerol 및 Shogaol 분석
    통계분석
Results and Discussion
    총 페놀 화합물 함량
    총 플라보노이드 함량
    DPPH 함량
    ABTS 함량
    Gingerol 및 Shogaol 함량
국문요약
Conflict of interests
ORCID
References

• 김수진(전라북도보건환경연구원 식품분석과) | Su-Jin Kim (Food Analysis Division, Jeollabukdo Institute of Health and Environment, Imsil, Korea)
• 김종신(전라북도보건환경연구원 식품분석과) | Jong-Sin Kim (Food Analysis Division, Jeollabukdo Institute of Health and Environment, Imsil, Korea)
• 김민지(전라북도보건환경연구원 식품분석과) | Min-Ji Kim (Food Analysis Division, Jeollabukdo Institute of Health and Environment, Imsil, Korea)
• 강지연(전라북도보건환경연구원 식품분석과) | Ji-Yeon Kang (Food Analysis Division, Jeollabukdo Institute of Health and Environment, Imsil, Korea)
• 최현정(전라북도보건환경연구원 식품분석과) | Hyeon-Jeong Choi (Food Analysis Division, Jeollabukdo Institute of Health and Environment, Imsil, Korea)
• 김소연(전라북도보건환경연구원 식품분석과) | So-Yeon Kim (Food Analysis Division, Jeollabukdo Institute of Health and Environment, Imsil, Korea)
• 이하은(전라북도보건환경연구원 식품분석과) | Ha-Euu Lee (Food Analysis Division, Jeollabukdo Institute of Health and Environment, Imsil, Korea)
• 권태혁(전라북도보건환경연구원 식품분석과) | Tae-Hyuk Kwon (Food Analysis Division, Jeollabukdo Institute of Health and Environment, Imsil, Korea)
• 강미숙(전라북도보건환경연구원 식품분석과) | Mee-Sook Kang (Food Analysis Division, Jeollabukdo Institute of Health and Environment, Imsil, Korea) Corresponding author