title: Highly sensitive and selective pre-column derivatization high-performance liquid chromatography approach for rapid determination of triterpenes oleanolic and ursolic acids and application to Swertia species: optimization of triterpenic acids extraction and pre-column derivatization using response surface methodology.
abstract: Oleanolic acid (OA) and ursolic acid (UA) are the ubiquitous triterpenic acids in plant kingdom and have multiple biological effects. In the present study, a highly sensitive and selective method using a dual-sensitive probe 2-(5-benzoacridine)ethyl-p-toluenesulfonate (BAETS) as pre-column labeling reagent has been developed for rapid determination of the triterpenes OA and UA by HPLC with fluorescence detection (FLD) and online mass spectrometry identification. Response surface methodology as an efficient tool was employed to optimize the ultrasonic-assisted extraction of triterpenic acids from Swertia plants and the pre-column derivatization reaction, respectively, which ensured the highest triterpenic acids recoveries within the shortest extraction time and the sufficient labeling of the analyzed components. Fast separation of the isomers OA and UA could be achieved on a Hypersil BDS C8 column within 7 min. Both of OA and UA gave the good correlation coefficients of 0.9999. This developed method offered the satisfactory detection limits of 1.10 and 1.30 ng mL(-1) for UA and OA, respectively. When applied to Swertia species, it showed good reproducibility.
authors.affiliation: Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining, 810001, PR China.
authors.forename: Guoliang
authors.initials: G
authors.lastname: Li
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Zhang
authors.forename: Jinmao
authors.initials: J
authors.lastname: You
authors.forename: Cuihua
authors.initials: C
authors.lastname: Song
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Sun
authors.forename: Lian
authors.initials: L
authors.lastname: Xia
authors.forename: Yourui
authors.initials: Y
authors.lastname: Suo
mesh_terms: D000166:Acridines / Q000737:chemistry; D001557:Benzenesulfonates / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D057230:Limit of Detection; D013058:Mass Spectrometry; D009828:Oleanolic Acid / Q000032:analysis*; D015203:Reproducibility of Results; D052616:Solid Phase Extraction; D029967:Swertia; D014315:Triterpenes / Q000032:analysis*; D000097245:Ursolic Acid
chemical_list: D000166:Acridines; D001557:Benzenesulfonates; D009828:Oleanolic Acid; D014315:Triterpenes; D000097245:Ursolic Acid; C550376:2-(5-benzoacridine)ethyl-p-toluenesulfonate