title: Determination of long-chain fatty acids in bryophyte plants extracts by HPLC with fluorescence detection and identification with MS.
abstract: A sensitive method for the determination of long-chain fatty acids (LCFAs) (>C20) using 1-[2-(p-toluenesulfonate)-ethyl]-2-phenylimidazole-[4,5-f]-9,10-phenanthrene (TSPP) as tagging reagent with fluorescence detection and identification with post-column APCI/MS has been developed. The LCFAs in bryophyte plant samples were obtained based on distillation extraction with 1:1 (v/v) chloroform/methanol as extracting solvent. TSPP could easily and quickly label LCFAs at 90 degrees C in the presence of K2CO3 catalyst in DMF. Eleven free LCFAs from the extracts of bryophyte plants were sensitively determined. Maximal labeling yields close to 100% were observed with a five-fold excess of molar reagent. Separation of the derivatized fatty acids exhibited a good baseline resolution in combination with a gradient elution on a reversed-phase Eclipse XDB-C8 column. Calculated detection limits from 1.0 pmol injection, at a signal-to-noise ratio of 3, were 26.19-76.67 fmol. Excellent linear responses were observed with coefficients of >0.9996. Good compositional data were obtained from the analysis of the extracted LCFAs containing as little as 0.2g of bryophyte plant samples. Therefore, the facile TSPP derivatization coupled with HPLC/APCI/MS analysis allowed the development of a highly sensitive method for the quantitation of trace levels of LCFAs from biological and natural environmental samples.
authors.affiliation: Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 810001, PR China. Jmyou6304@163.com
authors.forename: Jinmao
authors.initials: J
authors.lastname: You
authors.forename: Xianen
authors.initials: X
authors.lastname: Zhao
authors.forename: Yourui
authors.initials: Y
authors.lastname: Suo
authors.forename: Yulin
authors.initials: Y
authors.lastname: Li
authors.forename: Honglun
authors.initials: H
authors.lastname: Wang
authors.forename: Guichen
authors.initials: G
authors.lastname: Chen
mesh_terms: D044002:Bryophyta / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005227:Fatty Acids / Q000032:analysis* / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods*; D015394:Molecular Structure; D010616:Phenanthrenes / Q000737:chemistry; D010936:Plant Extracts / Q000032:analysis / Q000737:chemistry; D015203:Reproducibility of Results; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D005227:Fatty Acids; D010616:Phenanthrenes; D010936:Plant Extracts