Gastrodia elata has been used in traditional Chinese medicine for treating headaches, dizziness, and convulsive illness for centuries. G. elata has traditionally been processed by steaming or blanching to increase the content and quality of its main ingredients. This study aimed to identify changes in physicochemical properties and active ingredients of G. elata depending on the steaming time. Data of this study could be used to develop traditional medicine and health foods. No steaming was used as a control. Steaming time was 5, 10, 20, 30, 60, or 120 min. The drying yield according to the steaming time ranged from 20.2% to 22.9%, with the lowest drying yield at 120 min. As the steaming time increased, gastrodin content increased more than that in fresh G. elata due to inhibition of β-glucosidase enzyme activity, 4-hydroxybenzyl alcohol condensation, and parishin decomposition. Steamed G. elata did not show higher total polyphenols, total flavonoids, or ABTS radical scavenging activities than fresh G. elata even with an increase of steaming time. The steaming time to improve the quality of G. elata may varied depending on the size of G. elata. Thus, it is important to set the steaming time taking these characteristics into consideration.

서 론
재료 및 방법
    1. 시험재료 및 시약
    2. 증자방법
    3. 이화학적 품질 분석
    4. 물성 측정
    5. 유효성분 분석
    6. 총 폴리페놀 함량 분석
    7. 총 플라보노이드 함량 분석
    8. 항산화활성 분석
    9. 통계처리
결과 및 고찰
    1. 증자시간에 따른 건조수율 및 물성 변화
    2. 증자시간에 따른 천마 내부 변화
    3. 증자시간에 따른 천마 이화학적 품질 변화
    4. 증자시간에 따른 천마 유효성분 및 총당 함량 변화
    5. 증자시간에 따른 천마 총 폴리페놀, 총플라보노이드함량 및 항산화활성 변화
요약 및 결론
감사의 글
References

• 송영은(전북특별자치도농업기술원 작물식품과 농업연구관) | Young Eun Song (Senior Researcher, Division of Crops & Food, Jeonbuk State Agricultural Research & Extension Services, Iksan 54591, Korea) Corresponding author
• 김은주(전북특별자치도농업기술원 작물식품과 농업연구사) | Eun Ju Kim (Researcher, Division of Crops & Food, Jeonbuk State Agricultural Research & Extension Services, Iksan 54591, Korea)
• 한현아(전북특별자치도농업기술원 작물식품과 농업연구사) | Hyun Ah Han (Researcher, Division of Crops & Food, Jeonbuk State Agricultural Research & Extension Services, Iksan 54591, Korea)
• 이송이(전북특별자치도농업기술원 작물식품과 농업연구사) | Song Yee Lee (Researcher, Division of Crops & Food, Jeonbuk State Agricultural Research & Extension Services, Iksan 54591, Korea)
• 김창수(전북특별자치도농업기술원 약용자원연구소 농업연구사) | Chang Su Kim (Researcher, Medicinal Plant Resource Research Institute, Jeonbuk State Agricultural Research & Extension Services, Jinan 55440, Korea)
• 안민실(전북특별자치도농업기술원 작물식품과 농업연구관) | Min Sil Ahn (Senior Researcher, Division of Crops & Food, Jeonbuk State Agricultural Research & Extension Services, Iksan 54591, Korea)