Controlled release and antibacterial properties of chloramphenicol-loaded bacterial cellulose composite membranes

Bacterial cellulose-chloramphenicol (BC-Chl) composite membranes have been prepared using an impregnation-recrystallization method by loading chloramphenicol on bacterial cellulose. The morphology and structure of the composite membranes were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The results show that the BC-Chl composite membrane maintains the porous three-dimensional network structure of bacterial cellulose. The loading of chloramphenicol did not change the crystal form of the bacterial cellulose, but the loading process did destroy the crystalline region of the cellulose to a certain extent. After swelling for 12 h, the swelling ratio of the BC-Chl composite membrane was above 400%, showing its good water retention capacity. In vitro drug release experiments showed that the drug concentration peak time of the BC-Chl composite membrane was extended to about 2 h compared with 45 min for the chloramphenicol raw material, confirming a delayed drug release effect. Inhibition zone tests showed that when the drug loading was about 200 μg/mg, the inhibition zone diameter rates of the BC-Chl composite membrane against Corynebacterium glutamicum and Escherichia coli were 5.8 and 5.1, respectively. After SH-SY5Y cells were treated with the BC-Chl composite membrane with a drug loading of about 200 μg/mg for 24 h, the cell activity remained above 75%, indicating that the BC-Chl composite membrane had low cytotoxicity and good biocompatibility.