Gouveia, SandraCastilho, Paula C.2021-04-082021-04-082011Gouveia, S., & Castilho, P. C. (2011). Characterisation of phenolic acid derivatives and flavonoids from different morphological parts of Helichrysum obconicum by a RP-HPLC–DAD-(−)–ESI-MSn method. Food Chemistry, 129(2), 333-344.http://hdl.handle.net/10400.13/3256The phenolic composition from different morphological parts of Helichrysum obconicum was investigated for the first time and 50 different phenolic compounds were detected. Phenolic acid conjugates, mainly mono- and di-caffeoylquinic acid derivatives, were the major components; some flavonoid derivatives were also detected in small amounts. Their separation and identification was performed by a high-performance liquid chromatography/electron spray ionisation tandem ion trap mass spectrometry method, with special emphasis on MSn fragmentation. The presence of di- and tricaffeoylshikimic acid isomers in Helichrysum species extracts was reported for the first time, the spectra of these compounds were mainly characterised by the presence of a [caffeoylshikimic acid-H]- ion at m/z 335. A lamiridosins-di-O-hexoside, an unusual component in Asteraceae species, was also detected.engHydroxycinnamic acidsFlavonoidsLC–MSnHelichrysum.Faculdade de Ciências Exatas e da Engenhariajournal article10.1016/j.foodchem.2011.04.078