title: Insulin adsorption into porous charged membranes: effect of the electrostatic interaction.
abstract: Insulin adsorption into a series of porous charged membranes was investigated by batch adsorption experiments, and the experimental results were analyzed by the homogeneous diffusion model. The membranes used in this study were prepared by pore-surface modification of porous poly(acrylonitrile) (PAN) membranes by grafting with weak acidic and basic functional groups. The amount of insulin adsorbed into the membrane was determined from the material balance of insulin. The insulin partition coefficient K between the membrane and solution was estimated from the equilibrium adsorption amount, and the effective diffusion coefficient D was estimated by matching the model with the experimental data as a fitting parameter. The dependence of K and D on the charge properties of the insulin and membrane is observed and discussed. The partition coefficient K increased when the insulin and the membrane carried opposite charges, on the other hand, the effective diffusion coefficient D was reduced. These results indicate that the electrostatic interaction between the insulin and the membranes played an important role in the insulin adsorption.
authors: Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan.
authors: Shaoling
authors: S
authors: Zhang
authors: Akihiko
authors: A
authors: Tanioka
authors: Keiichiro
authors: K
authors: Saito
authors: Hidetoshi
authors: H
authors: Matsumoto
mesh_terms: D000327:Adsorption; D006801:Humans; D007328:Insulin / Q000737:chemistry*; D007700:Kinetics; D008567:Membranes, Artificial; D016062:Porosity; D011485:Protein Binding; D055672:Static Electricity; D013499:Surface Properties
chemical_list: D007328:Insulin; D008567:Membranes, Artificial