Journal
PHYTOCHEMICAL ANALYSIS
Volume 19, Issue 2, Pages 160-163Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/pca.1031
Keywords
microwave-assisted micellar extraction; cloud-point extraction; Triton X-100; glycyrrhizic acid; liquiritin
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The feasibility of employing a non-ionic surfactant (Triton X-100) as an alternative and effective solvent for the microwave-assisted extraction of glycyrrhizic acid and liquiritin from liquorice root has been demonstrated. When compared with commonly used solvents, 5% Triton X-100 yielded higher extraction efficiency than aqueous solutions of ethanol or methanol. Under optimal conditions, i.e. 5% Triton X-100 (v/v) and microwave-assisted extraction for 3-5 min at 100 degrees C, the percentage extraction of active ingredients reached the highest value. The pre-concentration factor for the glycyrrhizic acid and liquiritin was about 13, and the cloud-point extraction recoveries for the two ingredients were 98.4 and 96.1%, respectively. The results showed that the coupling of microwave-assisted extraction and cloud-point extraction could be employed as a new and effective approach for the rapid extraction and pre-concentration of pharmacologically active ingredients from liquorice root without disturbing the subsequent chromatographic analysis. Copyright (C) 2007 John Wiley & Sons, Ltd.
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