Identification of Flavonoids and Their Glycosides by High-Performance Liquid Chromatography with Electrospray Ionization Mass Spectrometry and with Diode Array Ultraviolet Detection
Restricted accessResearch articleFirst published online February, 2005
Identification of Flavonoids and Their Glycosides by High-Performance Liquid Chromatography with Electrospray Ionization Mass Spectrometry and with Diode Array Ultraviolet Detection
Identification of flavonoids and flavonoid glycosides was carried out on Psidium guajava Linn leaves by means of high-performance liquid chromatography ultraviolet (HPLC-UV) analysis and HPLC mass spectrometry. By using HPLC-UV, two known phenolics (gallic acid and quercetin) and five newly reported ones (procatechuic acid, chlorogenic acid, caffeic acid, kaempferol and ferulic acid) were identified in alcohol guava leaf extract. Structural information about the compounds was obtained from the retention times, the UV spectra and mass spectra without the need to isolate the individual compounds. Two flavonoids (quercetin and kaempferol) and four flavonoid glycosides (three known components, quercetin 3-O-alpha-L-arabinoside, quercetin 3-O-beta-D-glucoside and quercetin 3-O-beta-D-galactoside, along with one novel compound, kaempferol-glycoside) and three other unknown compounds have been identified in the fractions.
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