RESUMEN
Objective: To optimize Bletilla striata polysaccharide (BSP)/polyvinylalcohol (PVA) wet spinning process by Box- Behnken response surface method and prepare the composite fiber and performe their structural characterization and performance evaluation. Methods: Taking the OD value of three types of mechanical property data (breaking force, breaking strength and elongation at break) of the fiber as the evaluation index, five factors (BSP mass fraction, PVA mass fraction, volumetric mix ratio of BSP/PVA, coagulation time and spinning speed) were investigated by single factor experiments. On the basis of the results of single factor experiments, three factors (BSP mass fraction, volumetric mix ratio of BSP/PVA, coagulation time) were investigated by response surface method to optimize BSP/PVA composite fiber wet spinning process. The morphology, structure, thermal property, and absorption property of the fibers were characterized and analyzed by SEM, IR, DSC, and water absorption test. Berberine hydrochloride (BH) was used as model drug to evaluate the drug loading property of the composite fiber and antibacterial activity of the drug loading fiber. Results: The optimal spinning process of composite fiber were as follows: BSP mass fraction was 7.5%, volume mixing ratio of BSP/PVA was 1:1 and coagulation time was 3 min. The composite fiber had a dense surface and formed a three-dimensional network structure inside, generated intermolecular forces, which enhanced the thermal and mechanical properties, and exhibited excellent water absorption capacity. The encapsulation efficiency of the composite fiber reached 70.2%. And the drug loading fiber formed obvious inhibition zone in the bacteriostatic zone test, which presented excellent antibacterial effect against E. coli and S. aureus. Conclusion: The optimized spinning process is feasible and low cost. The prepared composite fiber has better physical property and certain coating ability, and its application in the field of biomedical textiles is worth further study.