Antioxidative and Antidiabetic Activities of Methanol Extracts from Different Parts of Jerusalem Artichoke (Helianthus tuberosus L.)

This study aimed to evaluate the efficacy of the antioxidative and antidiabetic activities of the flowers, leaves, and roots of the Jerusalem artichoke (Helianthus tuberosus L.). The total polyphenol and flavonoid contents of the leaves were higher than those of the flowers and roots. However, the DPPH radical-scavenging and hydroxyl radical-scavenging activities of the flowers were higher than those of the leaves and roots. The nitrite-scavenging ability under acidic conditions was high in Jerusalem artichoke flower extracts. The ${\alpha}-glucosidase$ inhibitory activity and ${\alpha}-amylase$ inhibitory activity of a methanol extract of Jerusalem artichoke roots were about 60% (5 mg/mL concentration). Based on these experiments, it can be concluded that the flowers leaves, and roots of the Jerusalem artichoke can be used as natural preservatives. Therefore, they can be developed as functional foods, to take advantage of their antioxidant activity and abundant polyphenols. This study suggests that the whole Jerusalem artichoke, including roots, leaves, and flowers, is useful as a functional, nutritious food product.

돼지감자 부위별 메탄올 추출물의 항산화 및 항당뇨 활성

본 연구에서는 돼지감자 꽃, 잎, 뿌리가 가진 기능성 식품 소재로서의 활용도를 높이고자 다양한 생리활성을 평가하였다. 돼지감자 꽃, 잎, 뿌리의 폴리페놀 함량은 32.80 mg GAE/extract g, 43.46 mg GAE/extract g, 24.53 mg GAE/extract g으로 나타났으며, 플라보노이드 함량은 각각 15.64, 18.67, 11.65 mg GAE/extract g으로 나타났다. 돼지감자 꽃, 잎, 뿌리의 메탄올추출물의 DPPH 라디칼 소거능 활성은 각각 77.78%, 66.07%, 26.93%로 나타났으며, hydroxyl radical 소거능 활성은 각각 55.33%, 38.30%, 34.89%로 나타났다. 돼지감자 꽃, 잎, 뿌리메탄올 추출물의 아질산염 소거능을 측정한 결과, 돼지감자 추출물의 농도가 증가함에 따라 그 활성 역시 증가하는 경향으로 나타났다. 돼지감자 부위별 메탄올 추출물(5 mg/mL)의 ${\alpha}-glucosidase$ 저해활성은 꽃, 잎, 뿌리에서 각각 41.08%, 55.67%, 60.76%로 유의적인 차이를 나타났으며, ${\alpha}-amylase$ 저해활성은 꽃, 잎, 뿌리에서 각각 49.95%, 59.88%, 66.25%로 유의적인 차이를 나타내었다.