Application of mixed cloud point extraction for the analysis of six flavonoids in Apocynum venetum leaf samples by high performance liquid chromatography

Typical chromatograms of determination of six flavonoids in Apocynum venetum leaf: (A) samples with mixed cloud point extraction; (B) samples with conventional cloud point extraction. rutin (RUT); hyperoside (HYP); quercetin-3-O-sophoroside (QER); isoquercitrin (ISO); astragalin (AST) and quercetin (QUE).