Infraspecific variation of surface and vacuolar flavonoids in wild and cultivated Origanum microphyllum (Bentham) Vogel (Lamiaceae): an endemic Cretan species.
1999
Azer, S.
Four different essential oil chemotypes of Origanum microphyllum (Bentham) Vogel (Labiate), collected in the eastern and western parts of Crete, were investigated for their flavonoids by means of High Performance Liquid Chromatography with Diode Array Detection (HPLC-DAD). External leaf flavonoids revealed the presence of six compounds, four of which could be identified by means of comparison of retention times, UV spectra and mass spectra with those of available standard compounds as the flavanone, naringenin (5,7,4'-trihydroxyflavanone), and the flavones apigenin (5,7,4'-trihydroxyflavone), cirsimaritin (5,4;-dihydroxy-6,7-dimethoxyflavone) and xanthomicrol (5,4;-dihydroxy-6,7,8-trimethoxyflavone). The remaining two compounds were tentatively identified as 5,7,4'-trihydroxy-6-methoxyflavanone and 5,4'-dihydroxy-6,7-dimethoxyflavanone on the basis of mass spectral data
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