In the procedure, surface characterizations were analyzed by using Attenuated Total Reflectance Infrared Spectroscopy (ATR?IR) and Scanning Electron Microscope (SEM), the concentrations of ?NCO and Hep on the surfaces were quantified.

• 用化学滴定法测每一步中表面（?NCO）浓度，用衰减全反射红外光谱，扫描电镜等分析了材料的表面性质，同时测定了肝素浓度。