Determination of resveratrol in grains, hulls and leaves of common and tartary buckwheat by HPLC with electrochemical detection at carbon paste electrode

► Three times more trans-resveratrol in grains of tartary than common buckwheat. ► Ten times more trans-resveratrol in leaves of common than tartary buckwheat. ► The lowest level of trans-resveratrol was in hulls of common buckwheat. ► ED for trans-resveratrol gives comparable LD as the UV/VIS detection. ► ED for cis-resveratrol is more sensitive than UV/VIS detection.