Preparative method of tectoridin from rhizome of Iris tectorum Non-covalent binding between tectoridin and plasma proteins by electrospray Isoflavonoids of Iris tectorrum Determination of five isoflavones in Iris leptophylla by HPLC Determination of five isoflavones in Iris leptophylla by HPLC Simultaneous determination of tectorigenin-7-O-xylosylglucosid, tectoridin and tectorigenin in flowers of Pueraria lobata by HPLC