ABSTRACT
Chitin is a polysaccharide that is biologically produced. In general, it is easy to obtain a large quantity of chitin from crab and shrimp shells that are considered as food waste. Chitosan is one of the few basic polysaccharides that is easily obtained by hydrolyzing chitin. Chitin and chitosan can be effectively utilized as separation membranes. This effective application of chitin and chitosan could consume a very large amount of these waste materials. When natural resource conservation, energy saving, and environmental preservation are considered, the use of chitin and chitosan also has large social advantages.
