Silk fibroin/calcium alginate composite modifying supermacroporous molecularly imprinted membrane synthesis for high performance on recognizing bovine hemoglobin

Bio-macromolecule hemoglobin (Hb) is a kind of iron-rich metalloprotein that abundant in erythrocytes with various physiological properties. Separating Hb from bio-matrix with high efficacy is crucial to Hb application but quite challenging. In this study, a supermacroporous molecularly imprinted membrane (MIM) was prepared with high performance on recognizing bovine hemoglobin (BHb). By using the silk fibroin and calcium alginate as mechanical modifiers, the mechanical strength of the prepared membrane was significantly improved to at around 0.25 MPa, and the supermacroporous structure in MIM was also formed. The MIM adsorption capacity of BHb was as high as 121.8 mg g −1 at the initial concentration of 0.5 mg mL −1 . The MIM separation factor of BHb from BHb/BSA mixtures was as high as 7.34, and the relative imprinting factor was at around 4.0. The prepared MIM demonstrated the superiority and the valuable application prospect on specific separation of BHb.