Adsorption Properties of D301 Resins on Phenols in Methanol Extracts of Astragalus complanatus R. Br.
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Abstract:
This work studied the adsorption properties of D301 resin on the phenols in methanol extracts of Astragalus complanatus R. Br., including static equilibrium adsorption isotherms and thermodynamic adsorptions. The results for static equilibrium adsorption isotherms showed that the adsorption of D301 resin on phenols in methanol extracts was an endothermic process, favorable physical adsorption. The Freundlich adsorption law was applicable to the adsorption of D301 resin on phenols within the conditions studied, since the relative coefficient was above 0.99. The results of dynamic adsorptions showed that 70% ethanol was the most suitable de-adsorption solvent. The adsorption equilibrium can be reached at the sample concentration of 13.5 mg/mL and flow of 2.0 mL/min for methanol extracts. After adsorption purification of D301, the purity of phenols in the methanol extracts was increased by more than three times. The results suggested that D301 resin can be used for purifying the phenols in the methanol extracts of Astragalus complanatus R. Br.
