Although, the investigation on colour properties of
fried potatoes has started many years ago, it has continued
with increasing interest in recent years. Toma,
Leung, Augustin, and Iritani (1986) studied the eect of
surface freezing pre-treatment on colour changes during
deep fat frying. They reported that surface freezing
treatment is an eective means of decreasing oil adsorption
and improving the colour of french fries. Smith
(1975) treated potato slices in a solution of glucoseoxidase,
an enzyme that changes glucose, one of the reducing sugars responsible for colour development in
chips, to gluconic acid, which does not enter into the
browning reactions. The results indicated that it may be
possible to use this treatment in order to reduce the
production of dark colour chips. Economically, however,
this method would not be justi®ed. Jiang and
Ooraikul (1989) examined the reduction of non-enzymatic
browning in potato chips and french fries with
glucose oxidase. They reported that enzyme treatment
results in a lighter and more uniform colour of french
fries