title: Assay of caffeoylquinic acids in Baccharis trimera by reversed-phase liquid chromatography.
abstract: Baccharis trimera commonly named 'carqueja', is wide-spread in South America and are used as raw material for herbal medicines. A reversed-phase liquid chromatography (RP-LC) method coupled to diode array detector was developed for the analysis of caffeoylquinic acids (CQAs), the main compounds responsible for its digestive activity. The identity of the quinic acids was established by mass spectrometry and were them: 5-O-[E]-caffeoylquinic acid, 3,4-O-[E]-dicaffeoylquinic acid, 3,5-O-[E]-dicaffeoylquinic acid, 4,5-O-[E]-dicaffeoylquinic acid and a tricaffeoylquinic acid. The RP-LC method for the quantitation of the caffeoylquinic acids was validated according to ICH guidelines, based on the following parameters: linearity, selectivity, robustness, limits of detection and quantification, precision and recovery. Hydroalcoholic extracts were prepared by the maceration of the plant material with ethanol:water 1:1 (v/v) in a 0.1:25 g mL(-1) plant:solvent ratio in a water bath at 40°C. Validation data indicated that the HPLC method proposed is suitable for the analysis of caffeoylquinic acids in B. trimera raw material. The results of the LOD and LOQ analyses for the 5-CQA were 4.1 μg mL(-1) and 12.5 μg mL(-1), respectively, 1.3 μg mL(-1), 3.9 μg mL(-1) for 4,5-diCQA and 1.7 μg mL(-1), 5.1 μg mL(-1) for triCQA. The levels of total CQAs ranged from 2.1 to 4.0 g% (w/w). The influence of season harvest and site collection was also evaluated and variations were observed in the results and can be related to phonologic phase, different locations, seasons and soil. Long term and photostability of plant material were carried out and was observed a stable behavior during the time of the experiments.
authors.affiliation: Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: Ana Lúcia
authors.initials: AL
authors.lastname: Aboy
authors.forename: Miriam Anders
authors.initials: MA
authors.lastname: Apel
authors.forename: Sílvia
authors.initials: S
authors.lastname: Debenedetti
authors.forename: Leandro
authors.initials: L
authors.lastname: Francescato
authors.forename: María Adelaida
authors.initials: MA
authors.lastname: Rosella
authors.forename: Amélia Teresinha
authors.initials: AT
authors.lastname: Henriques
mesh_terms: D001118:Argentina; D031175:Baccharis / Q000737:chemistry*; D001938:Brazil; D002851:Chromatography, High Pressure Liquid; D056148:Chromatography, Reverse-Phase / Q000379:methods*; D004355:Drug Stability; D057230:Limit of Detection; D055668:Photochemical Processes; D010936:Plant Extracts / Q000737:chemistry*; D011801:Quinic Acid / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D015203:Reproducibility of Results; D053719:Tandem Mass Spectrometry
chemical_list: D010936:Plant Extracts; C472707:caffeoylquinic acid; D011801:Quinic Acid