Results: portulaca extracts improved the devouring percentage and index of macrophage cell and promoted the formation of hemolysin and hemolysis void the transformation of lymphocyte.

It also could evidently improve the immunologic hypofunction (WBC phagocytosis and lymphocyte transformation etc.) induced by the cold stress in mice.

Methods the antigenicity of the synthetic peptide were predicted by the computer modeling, then verified by lymphocyte transformation test.