Total flavonoid from Glycyrrhizae Radix et Rhizoma and its ingredient isoliquiritigenin regulation M2 phenotype polarization of macrophages Determination of Three Flavonoids and Ferulic Acid in Pleurospermum hookeri C.B.Clarke var.thomsonii C.B.Clarke by HPLC Optimization of Synthesis Process of Isoliquiritigenin Effects of flavonoids from Glycyrrhizae Radix on function and expression of P-glycoprotein in Caco-2 cells Component analysis, and purification and characterization of active ingredients in aqueous extract from Sappan Lignum