Structure of hydroxycinnamic acid derivatives established by high-performance liquid chromatography with photodiode-array detection

The present paper describes the development of a method for the differentiation of hydroxycinnamic acid derivatives by HPLC with photodiode-array detection. Furthermore spectral data of the compounds under investigation are given. Whereas p-coumaric acid derivatives are distinguishable from caffeic and ferulic acid derivatives by the positions of their spectrum maxima and their convexity interval value, it is not possible to distinguish between caffeic and ferulic acid derivatives because of overlapping spectrum maxima and convexity interval values.The authors acknowledge the financial support of the Spanish "Comision Interministerial de Ciencia y Tecnologia" (proyect ALI92-0928).Peer reviewe