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

• Published in: Analytica chimica acta Vol. 688; no. 2; pp. 208 - 218
• Main Authors: Li, Guoliang, Zhang, Xiaolong, You, Jinmao, Song, Cuihua, Sun, Zhiwei, Xia, Lian, Suo, Yourui
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 04.03.2011; Elsevier
• Subjects: Acridines - chemistry; Analytical chemistry; Benzenesulfonates - chemistry; Chemistry; Chromatographic methods and physical methods associated with chromatography; Chromatography, High Pressure Liquid - methods; Exact sciences and technology; HPLC-FLD; Limit of Detection; Mass Spectrometry; Oleanolic Acid - analysis; Oleanolic acids; Other chromatographic methods; Pre-column derivatization; Reproducibility of Results; Response surface methodology; Solid Phase Extraction; Spectrometric and optical methods; Swertia; Swertia species; Triterpenes - analysis; Ursolic Acid; Ursolic acids; Swertia species; Oleanolic acids; Response surface methodology; HPLC-FLD; Ursolic acids; Pre-column derivatization; Sonication; On line; HPLC chromatography; Identification; Time; Derivatization; Probe; Optimization; Isomer; Plant; Sample preparation; Detection limit; Response surface; Extraction; Correlation coefficient; Fluorescence detector; Vegetals; Reproducibility; Triterpene; Application; Mass spectrometry
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2011.01.010

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.