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What is pectin made of? The composition of pectin.
Pectin is a kind of polysaccharide, which consists of homogeneous polysaccharide and impurity polysaccharide. Most of them exist in plant cell walls and cell lining, and a large number of them exist in citrus, lemon, grapefruit and other peels. White to yellow powder with relative molecular weight of about 20000 ~ 400000, tasteless. It is more stable in acidic solution than in alkaline solution, and is usually divided into high-ester pectin and low-ester pectin according to its esterification degree.

2. The high ester pectin forms an irreversible gel when the soluble sugar content is ≥60% and the pH is 2.6 ~ 3.4. Part of methyl ester of low-ester pectin is converted into primary amide, which is not affected by sugar and acid, and needs to combine with divalent ions such as calcium and magnesium to form gel.