A homogalacturonan from the radix of Platycodon grandiflorum and the anti-angiogenesis activity of poly-/oligogalacturonic acids derived therefrom

PGA4-3b, a polygalacturonic acid was isolated from Platycodon grandiflorum. The oligogalacturonans prepared by partial hydrolysis of PGA4-3b showed inhibition on cell tube formation.