Synergic cloud-point extraction using [C4mim][PF6] and Triton X-114 as extractant combined with HPLC for the determination of rutin and narcissoside in Anoectochilus roxburghii (Wall.) Lindl. and its compound oral liquid.

A green, novel and efficacious method for the simultaneous extraction and enrichment of rutin and narcissoside from the compound Anoectochilus roxburghii (Wall.) Lindl. oral liquid (CAROL) and Anoectochilus roxburghii (Wall.) Lindl. was developed. Ionic liquid-surfactant synergic cloud-point extraction (IL-CPE) was used to enrich two analytes, which were determined by high-performance liquid chromatography (HPLC). Some parameters affecting IL-CPE were optimized, such as ratio and volume of 1-butyl-3-methyl-imidazolium hexafluorophosphate and Triton X-114, pH of the sample, NaCl concentration, total extraction volume, incubation temperature and time, centrifuge rate and time. The corresponding linearity range for two analytes exhibited good linearity (r2＞0.9997), with the average added recoveries ranging from 92.1% to 98.9%. The limits of detection of rutin and narcissoside were 0.26 and 0.30 ng/mL, respectively. The method was successfully applied for the determination of two flavonoids in the complex-matrix sample, i.e. CAROL and the water extract of A. roxburghii. The mass spectrum data showed that the sample contained rutin and narcissoside. Compared with conventional extraction methods, IL-CPE exhibited higher extraction efficiency and better extraction selectivity. This method may provide a novel platform for the determination of active ingredients in compound Chinese medicine oral liquid and herb.