【Objective】To explore the extraction methods of protein samples for SDS-PAGE and two-dimensional electrophoresis( 2-DE) of the stem,vegetable,and vegetable seeds,and lay the foundation for the study of seed protein proteomics of the two species of Lepidium plants.【Method】The efficiency of four protein extraction methods were compared and analyzed through protein purity detection and SDS-PAGE.【Result】Of all the four methods,TCA/acetone extraction method generated higher yield as well as highest resolution an...