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|title: ||Characterization of Phenolic Components in Polar Extracts of Eucalyptus globulus Labill. Bark by High-Performance Liquid Chromatography-Mass Spectrometry|
|authors: ||Santos, Sónia A. O.|
Freire, Carmen S. R.
Domingues, M. Rosário M.
Silvestre, Armando J. D.
Neto, Carlos Pascoal
|keywords: ||Eucalyptus globulus Labill.|
Tandem mass spectrometry
|issue date: ||2011|
|publisher: ||American Chemical Society|
|abstract: ||High-performance liquid chromatography electrospray ionization mass spectrometry (HPLC-ESI-MS) and tandem mass spectrometry (MS") were used to investigate the phenolic constituents in methanol, water, and methanol/water extracts of Eucalyptus globulus Labill. bark. Twenty-nine phenolic compounds were identified, 16 of them referenced for the first time as constituents of E. globulus bark, namely, quinic, dihydroxyphenylacetic, and caffeic acids, bis(hexahydroxydiphenoyl (HHDP))-glucose, galloyl-bis(HHDP)-glucose, galloyl-HHDP-glucose, isorhamentin-hexoside, quercetin-hexoside, methylellagic acid (EA) pentose conjugate, myricetin-rhamnoside, isorhamnetin-rhamnoside, mearnsetin, phloridzin, mearnsetin-hexoside, luteolin, and a proanthocyanidin B-type dimer. Digalloylglucose was identified as the major compound in the methanol and methanol/water extracts, followed by isorhamnetin-rhamnoside in the methanol extract and by catechin in the methanol/water extract, whereas in the water extract catechin and galloyl- HHDP-glucose were identified as the predominant components. The methanol/water extract was shown be the most efficient to isolate phenolic compounds identified in E. globulus bark.|
|publisher version/DOI: ||http://dx.doi.org/10.1021/jf201801q|
|source: ||Journal of Agricultural and Food Chemistry|
|appears in collections||DQ - Artigos|
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