Corydalis Extract Tetrahydropalmatine (dl-THP)

Tetrahydropydalin (dl-THP) belongs to the isoquinoline alkaloids and is an alkaloid, mainly in the genus Corydalis lucidum (Yan Hu Suo), but also in other plants such as Stephania rotunda. These plants have traditional uses in Chinese herbal medicine. Corydalis is a perennial herbaceous plant, 10 to 20 cm tall, with spherical tubers. Its above-ground stems are short and slender, with a scale above the base. Basal leaves and cauline leaves are similar in shape, with stalks; cauline leaves are alternate, with 2 and 3 compound leaves. The second leaf often splits incompletely and is deeply lobed. The small leaves are oblong, oval, or oval. Linear, about 2 cm long, with blunt or sharp apex and neat edges. Its inflorescence is raceme-shaped, with terminal or opposite leaves; the bracts are broadly lanceolate; the flowers are reddish-purple and grow horizontally on slender pedicels, which are about 6 mm long; the calyx falls early; the petals are 4 and the outer whorls are 2 The segments are slightly larger, with pink edges and bluish-purple center. There is one upper segment, and the tail extends into a long spur. The spur length accounts for about half of the total length. The inner 2 segments are narrower than the outer 2 segments. The upper end is bluish-purple and healed, and the lower segment is pink; The stamens are 6, and the filaments are connected into two bundles, each with 3 anthers; the ovary is flat-cylindrical, the style is short and thin, and the stigma is 2, like a small butterfly. Its fruit is a capsule. Corydalis is mainly produced in mountains or grasslands. The main producing areas include Zhejiang, Hebei, Shandong, Jiangsu, and other places.