The invention provides a
polygala tenuifolia extract for a parkinson's
disease and a preparation method and an application of the
polygala tenuifolia extract. The method comprises the following specific steps: taking a
polygala tenuifolia material, adding 95%
ethanol to soak over the night, carrying out heating
reflux extraction and
filtration and recovering
ethanol until no
alcohol taste in a vacuum condition to obtain an
alcohol extract; adding water to soak the residual filter residues after
filtration over the night, carrying out heating
reflux extraction,
filtration and vacuum concentration until a
liquid extract to obtain a water extract; mixing the
alcohol extract and the water extract at equal volume; adding
petroleum ether, carrying out extracting and separating to remove the
petroleum ether part; adding
chloroform to the residual water solution, extracting and collecting a
chloroform extracting solution; and concentrating the
chloroform extracting solution until an extract,
drying the extract in vacuum and crushing the product to obtain the effective part B. Through an
in vitro anthropogenic dopa
decarboxylase inhibitor screening model, the screened
polygala tenuifolia effective part B has obvious anti-PD activity and can be applied to preparation of anti-PD medicines.