Combination of supercritical fluid elution and resin adsorption for removal of procymidone from ginseng extracts
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We propose a new method of resin adsorption (RA) coupled with supercritical fluid elution (SFE) for removal of pesticide residue and recovery of ginsenosides from ginseng extracts. D-101-1 resin was selected as the proper adsorption resin, acetone-n-hexane (4 : 6, v : v) served as the modifier with the flow rate of 1.5 mL/min during supercritical CO2 elution of procymidone at 25 MPa, 55°C for 2 h, and absolute ethanol as the modifier at a flow rate of 1 mL/min for supercritical CO2 elution of ginsenosides at 20 MPa, 60°C and 1 h. The results showed that the content of procymidone in the final products was only 0.0089 mg/kg. Meanwhile, the recovery rate of ginsenosides reached up to 92.5%. RA-SFE procedure provides an efficient approach to remove pesticide residue traces with little loss of active ingredients. The used resin can be recycled without any additional regeneration.
KeywordsProcymidone Pesticide Residues Ginsenosides Supercritical CO2 Extraction Resin Adsorption
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