The invention discloses a method for enriching and separating human
peripheral blood CD34<+> and CD91<+> stem cells, which provides basis for the subsequent researches on CD34<+> and CD91<+> stem cells better, and relates to the field of
biomedicine. The method comprises the following steps of: covalently
coupling a multi-arm well star-shaped
polymer with a mouse anti-human CD34<+> or CD91<+>
monoclonal antibody;
coating long-chain
biotin molecules on the multi-arm well star-shaped
polymer modified by the mouse anti-human CD34<+> or CD91<+>
monoclonal antibody; capturing the CD34<+> and CD91<+> stem cells in a
peripheral blood sample by the multi-arm well star-shaped
polymer modified by the mouse anti-human CD34<+> or CD91<+>
monoclonal antibody; identifying and
coupling the long-chain biotinylated well star-shaped polymer in the
peripheral blood by
nanometre magnetic beads modified by
streptavidin; separating and re-suspending the captured CD34<+> and CD91<+> stem cells, and the like, wherein the re-suspension can be directly used for subsequent analysis. Compared with the traditional
cell separation method, the method is more suitable for performing
magnetic separation on the CD34<+> and CD91<+> stem cells in the complex
peripheral blood sample, and capable of increasing the separation efficiency for the CD34<+> and CD91<+> stem cells in the
peripheral blood sample.