Oligomeric proantho cyanidins (OPC) is a polyphenol compound of a flavanol monomer and polymer,
which exists widely in various organs of plants. It has strong oxidation resistance and the ability of
scavenging free radical. It used widely in pharmaceutical, food, cosmetics, health care products and so on.
Under acidic conditions，resorcinol and pyrogallol in A ring of plant OPC can react with vanillin to form
colored compound, which can be detected by colorimetric assay at 500 nm and calculate the content of
OPC.
Reagents and Equipment Required but Not Provided:
Spectrophotometer, balance, the room temperature centrifuge, 1 mL glass cuvette, distilled water.
