Screening of the polyphenol content of tomato-based products through accurate-mass spectrometry (HPLC-ESI-QTOF)

► The phenolic fingerprint identified by HPLC-QTOF showed differences among tomato by-products. ► HPLC-QTOF enabled 47 polyphenols to be identified in tomato by-products, five of them previously unreported in tomatoes. ► This is the first time that the phenolic composition of gazpachos has been evaluated. ► An accurate characterisation of ketchups and tomato juices was also obtained. ► Good mass accuracies were achieved both in MS and MS/MS experiments using LC-ESI-Q-TOF-MS.