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Keto-enol tautomers of curcumin were confirmed by reversed-phase liquid chromatography(RPLC)/ hybrid quadrupole ion trap/time-of-flight mass spectrometry(QIT/TOFMS).Tautomers gave different MS/MS spectra in negative mode.Different mass spectra were also obtained by hydrogen/deuterium exchange LC/MS/MS in positive mode.Our results suggest that enol form is the major form in the solution(water/acetonitrile).
Keto-enol tautomers of curcumin were also by reversed phase phase chromatography (RPLC) / hybrid quadrupole ion trap / time-of-flight mass spectrometry (QIT / TOFMS) .Tautomers gave different MS / MS spectra in negative mode. were also obtained by hydrogen / deuterium exchange LC / MS / MS in positive mode. Our results suggest that enol form is the major form in the solution (water / acetonitrile).