Diode array detection was used for the identification of the compounds. Retention times and UV visible spectra of the peaks were compared with those of the standards. Ellagic acid and p-hydroxybenzoic acid were detected at 260 nm, gallic acid at 280 nm, hydroxyl-cinnamic acids at 320 nm and flavonols at 360 nm. Quantification of the phenolic compounds in berries was performed using quercetin and p-coumaric acid as secondary standards for flavonoids (kaempferol and myricetin) and phenolic acids (caeic, ferulic, p-hydroxy-benzoic, gallic and ellagic acids), respectively. The standard curves for the secondary standards were run once a week. The relative responses (see HaÈ kkinen et al., 1998) for each pure compound were calculated from the doseresponse curves of quercetin and p-coumaric acid. The detector response was taken into account in the determination of the phenolic profiles of the berries.