Some phenolic acids from the flowers of Delphinium formosum have been deter
mined quantitatively by reversed-phase high-performance liquid chromatograp
hy with diode-array detection. A comparative study was performed by extract
ing the following phenolic acids: p-hydroxy benzoic, p-coumaric, caffeic, p
rotocatechuic and vanillic acids with four different methods, The results w
ere supported with recovery studies.