pectin

The process also activates pectin, an acidic polysaccharide present in many fruits that sets the jam into a spreadable gel.

Farmhouses across the nation practically required at least one of the long-lived trees because of quinces’ natural pectin, an important gelling ingredient in preserves.

Sugar, pectin and a little lemon juice are the only other ingredients.

The fiber pectin is found mainly in an apple's pulp.

When grapes are crushed, the juice produced contains tiny particles of pectins, carbohydrates and proteins, which create a haze or cloudiness in the wine.