Conventional clarification processes
aim to eliminate the insoluble solids and destroy pectic substances
by degrading pectin and starch with specific enzymes,
flocculating cloudiness with clarifying agents (bentonite,
gelatine and/or silicasol) (Grampp, 1977) and
filtering through plate and frame or vacuum Oliver-type filters.
Pectin is the main substance responsible for cloudiness
of apple juice.