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 α-glucosidase inhibitory activity and α-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.