presence in jam and jellies is also well known. The main problem of
traditional pectin biosensors is the high viscosity of pectin solutions,
which usually foul the electrode surface. By using plant tissue
biosensors, this problem is overcome, as the tissue tolerates better the
pectin absorption or, if not, it ismuchmore easily and cheaply replaced.
Horie and Rechnitz (1995) developed a hybrid biosensor for pectin
combining orange peel tissue, as pectinesterase source, and alcohol
oxidase.