[Examination of Extraction Conditions of Chlorogenic Acid and Its Content in Domestic Phellodendron amurense Leaves].

Phellodendron amurense is a broad-leaved tree; its outer bark and cork layers are removed and used as a crude medicinal agent known as Phellodendri Cortex. These trees are cultivated for approximately 15 to 20 years, harvested by felling, and processed by separating the outer and inner bark. Conventionally, parts other than the inner bark (i.e., fruit, leaves, and heartwood) remain unused. However, the revenue earned from by-products could contribute to continued cultivation of Phellodendron amurense. Herein, we examined the extraction condition and investigated the content of chlorogenic acid in the leaves of domestic Phellodendron amurense, which possesses antioxidant activity.