Pectin is a structural heteropolysaccharide contained in the primary cell walls of terrestrial plants. It is white to light yellow powder, soluble in water, insoluble in ethanol and other organic solvents. It is a kind of new, natural and functional food additive,mainly extracted from citrus fruits, and is used in food as a gelling agent, particularly in jams and jellies. It is also used in fillings, medicines, sweets, as a stabilizer in fruit juices and milk drinks, and as a source of dietary fiber. .