Pectin is a natural and commercially produced essential ingredient in preserves, like jellies and jams. Without pectin, jellies and jams won't gel. Pectin is a type of starch, called a heteropolysaccharide, that occurs naturally in the cell walls of fruits and vegetables and gives them structure. When combined with sugar and acid, it is what makes jams and jellies develop a semisolid texture when they cool. Some fruits, like apples and quince, and the rinds, seeds, and membranes of citrus are naturally very high in pectin. 

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