Abstract
In this work, we have developed an efficient method for the rapid extraction and separation of triterpene acids from 37 different varieties of raspberry via ultrasound-assisted dispersive liquid–liquid microextraction (UA-DLLME). The triterpene acids were then determined by high-performance liquid chromatography (HPLC) with fluorescence detection using benzimidazo-[2,1-b]quinazolin-12(6H)-one-5-ethyl-p-toluenesulfonate (BQETS) as the labeling agent. Five triterpene acids, including asiatic acid (AA), maslinic acid (MA), corosolic acid (CA), oleanolic acid (OA) and betulinic acid (BA), were extracted by UA-DLLME using chloroform and acetone as the extracting and dispersing solvents, respectively. After extraction and nitrogen flushing, the extracts were simultaneously characterized by HPLC based on pre-column derivatization using BQETS, a new labeling agent synthesized in our laboratory. Several key parameters affecting the extraction efficiency and derivatization yields were investigated and optimized by response surface methodology (RSM) combined with Box–Behnken design (BBD). The method was further validated for linearity (correlation coefficient R 2 > 0.9979), precision (RSD = 0.23–2.45 %), and recovery (RSD = 90–106.5 %). The limits of detection (LODs) and the limits of quantification (LOQs) were determined to be within the range of 1.83–7.69 µg/L and 6.06–25.47 µg/L, respectively. This is the first report of the use of BQETS as a pre-column derivatization agent for the determination of triterpene acids in real samples. The proposed method has been applied to the determination of five triterpene acids in 37 different raspberry varieties with significantly increased sensitivity compared to other methods. The results obtained indicate that the contents of triterpene acids vary significantly across different raspberry varieties.
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Acknowledgments
The authors acknowledge the financial support from major science and technology projects of Qinghai Province: utilization and development with high value and further process technology of medlar (2015-NK-A2), and the unit of science and technology office of Qinghai province: manufacture integration technology and demonstration of high standards medlar with antioxidant and anti-cohesion (2015-SF-120).
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Wang, Y., Suo, Y., Sun, Y. et al. Determination of Triterpene Acids from 37 Different Varieties of Raspberry using Pre-column Derivatization and HPLC Fluorescence Detection. Chromatographia 79, 1515–1525 (2016). https://doi.org/10.1007/s10337-016-3174-1
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DOI: https://doi.org/10.1007/s10337-016-3174-1