By comparing the reduction of turbidity of juices after enzy-
matic treatment, one can observe irregular responses to tempera-
ture, especially for the clear juices evaluated. Such observation
suggests that, besides the best reaction temperature found for the
different enzyme preparations in tests with pure substrate, the
particular characteristics of juicesmust be taken in account. Among
different possibilities that could be proposed to explain the results
obtained, one could include: i) higher temperatures could interfere
on the solubility of substances that are responsible for turbidity of
each juice; ii) pectinase activity could vary with temperature,
depending on the size of the pectic chain and its ramification and
methylation degree; iii) one or more enzymes of the pectinolytic
complex in test could be thermo-sensible.