Purification of Anthocyanins from Extracts of Red Raspberry Using Macroporous Resin

摘要

The performances and separation characteristics of nine widely used macroporous resins for the enrichment and purification of anthocyanins from red raspberries extracts were investigated. AB-8 resin offered the maximum adsorption and desorption behavior for anthocyanins among the resins tested, and its adsorption behavior was fitted to the Langmuir and Freundlich isotherms at different temperatures. In order to optimize the operating process, the dynamic adsorption and desorption experiments were carried out on an AB-8 resin-packed column. The optimum parameters for adsorption were sample solution anthocyanins concentration 0.2912 mg/mL, processing volume 3.5 BV, flow rate 0.5 mL/min; optimum parameters for desorption were elution solvent ethanol-water (60:40, v/v) 2.5 BV and flow rate 1.0 mL/min. After one run treatment with AB-8 resin, the anthocyanins purity increased 19.1-fold with a recovery yield of 98.84%. Two kinds of anthocyanins were obtained by further processing with a Sephadex LH-20 column, which were identified as cyanidin-3-glucoside and cyanidin-3-sophoroside using high-performance liquid chromatography-mass spectrometry, and the purity was 95.52 and 94.76%, respectively. The separation process developed via column chromatography in this study provided a potential approach for scale-up purification of anthocyanins from red raspberries or other similar berries.