Directional separation of active ingredients of dehydrotumulosic acid from Guizhi Fuling Capsule by molecular imprinting technique Application of molecular imprinting polymer in study on Chinese materia medica Determination of shikonin in Arnebia euchroma by molecular imprinting-flow injection chemiluminescence method Determination of shikonin in Arnebia euchroma by molecular imprinting-flow injection chemiluminescence method