title: Two New Isomers of Palmityl-4-hydroxycinnamate from Flowers of Taraxacum Species.
abstract: Two isomers, (Z)- and (E)-palmityl 4-hydroxycinnamate [hexadecyl(2Z)-3-(4-hydroxyphenyl)prop-2-enoate and hexadecyl(2E)-3-(4-hydroxyphenyl)prop-2-enoate] were isolated for the first time from ligulate flowers of Taraxacum linearisquameum Soest (sect. Taraxacum). The highest amount of these compounds was detected in pollen grains; 0.26 mg/100 mg DW of the (E)-isomer and 0.096 mg/100 mg DW of the (Z)-isomer. The structures of these compounds were elucidated by a combination of HPLC-ESI-Qtof-MS and 1D and 2D NMR spectroscopy. Their presence was confirmed in other species of Taraxacum, but they were not found in the male - sterile triploid agamospermous taxon T. parnassicum.
authors.forename: Matej
authors.initials: M
authors.lastname: Dudáš
authors.forename: Mária
authors.initials: M
authors.lastname: Vilková
authors.forename: Tibor
authors.initials: T
authors.lastname: Béres
authors.forename: Miroslav
authors.initials: M
authors.lastname: Repcák
authors.forename: Pavol
authors.initials: P
authors.lastname: Mártonfi
mesh_terms: D002934:Cinnamates / Q000737:chemistry*; D035264:Flowers / Q000737:chemistry; D007536:Isomerism; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry*; D031205:Taraxacum / Q000737:chemistry*
chemical_list: D002934:Cinnamates; D010936:Plant Extracts