title: Characterization of polymethoxylated flavones in Fructus aurantii by off-line two-dimensional liquid chromatography/electrospray ionization-ion trap mass spectrometry.
abstract: Off-line two-dimensional reversed-phase liquid chromatography (2D-RPLC) coupled to electrospray ionization-ion trap mass spectrometry (ESI-ITMS) was operated in positive mode (PI) to characterize polymethoxylated flavonoids (PMFs) in botanical sample. The fragments of [M+H-nx15](+) produced by loss of one or more methyl group from the protonated molecules, as well as [M+H-14](+), [M+H-29](+), [M+H-33](+), [M+H-43](+), [M+H-46](+) and [M+H-61](+) fragments formed the multiple MS (MS(n)) "fingerprint" of PMFs. 42 target compounds were tentatively identified from the extract of Fructus aurantii (F. aurantii) based on this "fingerprint". Experimental outcomes indicated that the application of 2D separation method can reduce the matrix suppression of analytes caused by the coelution with interferential components and the column overloading of interferential components. 42 versus 23 target compounds were detected through 2D versus 1D method, which confirm the superiority of 2D coupled to MS in elimination of matrix effects.
authors.affiliation: College of Bio & Food Technology, Dalian Polytechnic University, Dalian 116034, People's Republic of China.
authors.forename: Da-Yong
authors.initials: DY
authors.lastname: Zhou
authors.forename: Qing
authors.initials: Q
authors.lastname: Xu
authors.forename: Xing-Ya
authors.initials: XY
authors.lastname: Xue
authors.forename: Fei-Fang
authors.initials: FF
authors.lastname: Zhang
authors.forename: Xin-Miao
authors.initials: XM
authors.lastname: Liang
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D047309:Flavones / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D015394:Molecular Structure; D008970:Molecular Weight; D010936:Plant Extracts / Q000737:chemistry; D012015:Reference Standards; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D004365:Drugs, Chinese Herbal; D047309:Flavones; D010936:Plant Extracts