Utilization of Dispersive Liquid-Liquid Microextraction Coupled with HPLC-UV as a Sensitive and Efficient Method for the Extraction and Determination of Oleanolic Acid and Ursolic Acid in Chinese Medicinal Herbs — Oak Academic Publishing
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Utilization of Dispersive Liquid-Liquid Microextraction Coupled with HPLC-UV as a Sensitive and Efficient Method for the Extraction and Determination of Oleanolic Acid and Ursolic Acid in Chinese Medicinal Herbs
School of Pharmacy, Shanxi Medical University, Taiyuan, China
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School of Pharmacy, Shanxi Medical University, Taiyuan, China
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School of Pharmacy, Shanxi Medical University, Taiyuan, China
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School of Pharmacy, Shanxi Medical University, Taiyuan, China
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School of Pharmacy, Shanxi Medical University, Taiyuan, China
1 School of Pharmacy, Shanxi Medical University, Taiyuan, China
2 School of Pharmacy, Shanxi Medical University, Taiyuan, China
3 School of Pharmacy, Shanxi Medical University, Taiyuan, China
4 School of Pharmacy, Shanxi Medical University, Taiyuan, China
5 School of Pharmacy, Shanxi Medical University, Taiyuan, China
Isomeric triterpenic acids of oleanolic acid (OA) and ursolic acid (UA) both have very low ultraviolet absorption and always exist in the same plant, so the separation and simultaneous determination of them have been a difficult task. In this study, a sensitive method combining dispersive liquid-liquid microextraction (DLLME) with HPLC-UV was developed for the extraction and determination of OA and UA in traditional Chinese medicinal herbs (CMHs). Variables influencing DLLME such as type and volume of extraction solvent, volume of dispersive solvent, ionic strength, aqueous phase pH, extraction time, centrifugation speed and time, and sample volume were investigated and optimized. Under the optimum conditions, both OA and UA attained favorable extraction efficiencies with enrichment factors 1378 and 933, respectively. The linear dynamic ranges of 0.07 - 30.4 μg?mL–1 for OA and 0.08 - 33.6 μg?mL–1 for UA were obtained with square correlation coefficients of 0.9963. The detection limits of OA and UA were both 0.02 μg?mL–1. The method recoveries ranged between 88.2% - 116.2% for OA and 85.7% - 108.2% for UA with the RSDs (n = 5) lower than 8.6%. The proposed method was successfully applied to concentrate and simultaneously determine these two triterpenic acids in Hedyotis diffusa and Eriobotrya japonica samples.
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