Optimisation of preparative HPLC separation of four isomeric kaempferol diglycosides from Prunus spinosa L. by application of the response surface methodology

Publication date: Available online 5 February 2017 Source:Phytochemistry Letters Author(s): Aleksandra Owczarek, Anna Magiera, Magdalena Matczak, Dorota Gabriela Piotrowska, Monika Anna Olszewska, Anna Marchelak A fast and efficient preparative HPLC-PDA method was developed for the separation and isolation of four rare isomeric kaempferol diglycosides from leaves of Prunus spinosa L. The separation procedure of the enriched diglycoside fraction of the 70% (v/v) aqueous methanolic leaf extract was first optimised on analytical XBridge C18 column (100mm×4.6mm i.d., 5μm) and central composite design combined with response surface methodology was utilized to establish the optimal separation conditions. The developed method was directly transferred to preparative XBridge Prep C18 column (100mm×19mm i.d., 5μm) and the final separation was accomplished by isocratic elution with 0.5% acetic acid-methanol-tetrahydrofuran (75.2:16.6:8.2, v/v/v) as the mobile phase, at a flow rate of 13.6mL/min, in less than 12min for a single run. Under these conditions, four flavonoid diglycosides: kaempferol 3-O-α-l-arabinofuranoside-7-O-α-l-rhamnopyranoside, kaempferol 3,7-di-O-α-l-rhamnopyranoside (kaempferitrin), and reported for the first time for P. spinosa kaempferol 3-O-β-d-xylopyranoside-7-O-α-l-rhamnopyranoside (lepidoside) and kaempferol 3-O-α-l-arabinopyranoside-7-O-α-l-rhamnopyranoside, were isolated in high separation yield (84.8–94.5%) and purity (92.45–99.79%). T...
Source: Phytochemistry Letters - Category: Chemistry Source Type: research