Resin adsorption as a means to enrich rare stilbenes and coumarin from pigeon pea leaves extracts

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 172; no. 2-3; pp. 864 - 871
• Main Authors: Wei, Zuofu, Zu, Yuangang, Fu, Yujie, Wang, Wei, Zhao, Chunjian, Luo, Meng, Efferth, Thomas
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 15.08.2011; Elsevier
• Subjects: Adsorption; Adsorption kinetics; Applied sciences; Chemical engineering; Coumarin; Desorption; Exact sciences and technology; Isotherm models; Isotherms; Leaves; Pigeon pea; pigeon peas; Pigeons; Polymers; Resin adsorption; Resins; sorption isotherms; Stilbenes; Pigeon pea; Adsorption kinetics; Isotherm models; Stilbenes; Resin adsorption; Coumarin; Adsorption isotherm; Adsorption capacity; Desorption; Extract; Plant leaf; Modeling; Langmuir isotherm; Operating conditions; Kinetic model; Adsorption; Preparation; pH; Kinetics; Macroporosity
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2011.06.075

• Only aqueous ethanol has been used to desorb target compounds, and the use of macroporous resin is a green method. • Resin adsorption was suitable for industrial scale-up applications, easy operation, low cost, and can be reused. • Adsorption kinetics and isotherm were investigated. • CSA, LLC and CL present striking pharmacological activities and rarely exist in plants. In this study, resin adsorption as a means to enrich rare stilbenes cajaninstilbene acid (CSA) and longistyline C (LLC), and coumarin cajanuslactone (CL) from pigeon pea leaves was investigated. Among widely used twenty macroporous adsorption resins, NKA-9 resin presented higher adsorption capacity and desorption ratio in static tests. The adsorption kinetic model fitted better depended on types of compounds and pH values. The experimental adsorption data were better fitted to Langmuir isotherm (R2 0.921–0.991) than Freundlich isotherm (R2 0.753–0.988). In order to optimize the operating parameters for separating CSA, LLC and CL, dynamic adsorption and desorption tests were carried out. After one run treatment with NKA-9 resin, the contents of CSA, LLC and CL in the product were 10.82-, 9.07- and 108.90-fold increased with recovery yields of 81.31%, 89.76% and 96.77%, respectively. Moreover, NKA-9 resin exhibited excellent reusability within at least five cycles of adsorption/desorption. The developed methodology is a promising basis for large-scale preparation of CSA, LLC and CL from pigeon pea leaves.