The extraction and the purification techniques ofprocyanidins from grape (Vitis davidii Foex)seed were studied. The four main factors influencing traditional solvent extraction including extracting reagent concentration, proportion of material and extracting reagent, extracting temperature and time were investigated. The optimum technical conditions were summed up as follows through orthogonal experiments: extracting reagent was 70 % aqueous ethanol solution, proportion of material and extracting reagent was 1:7, temperature was at 60 ℃, a...