A copolymer gel prepared from N-isopropyl-acrylamide (NIPA) and vinylf
errocene (VF) exhibits volume phase transition. The phase transition c
an be controlled electrochemically, and electrochemical behavior of th
e gel can be controlled thermally. A copolymer of NIPA and VF, which i
s not crosslinked, also possesses similar characteristics. Those polym
er and gel can be applied to enzyme electrodes. (C) 1997 by John Wiley
& Sons, Ltd.