Water-insolubility and moderate, anisotropic swelling propertyand mechanical property of these films make them useful bioma-terials for applications such as wound dressings, sealing films, andplaster-type drug delivery systems. Functions of these films, suchas material loading and release ability, molecular permselectivity,and cell adhesion and proliferation abilities, are currently beingprocessed to gain experimental proof of the potential use of thesefilms in biomedical and biochemical applications.