A smart core–sheath nanofiber that captures and releases red blood cells from the blood

A smart, core–sheath polycaprolactone/poly(N-isopropylacrylamide) (PNIPAAm)/nattokinase nanofiber is fabricated by single-spinneret electrospinning. The nanofiber can directly capture the red blood cells from the blood and release without damage of cells.