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Determination of Significance：
Pectin is one of the main components of plant cell walls, and is divided into water-soluble pectin and insoluble pectin (original pectin or alkali-soluble pectin). Pectin is a natural polymer compound with good gelling and emulsifying stability. It has been widely used in food, medicine, daily chemical and textile industries.
Measurement Principle：
The original pectin is hydrolyzed into soluble pectin in dilute acid. It and the original soluble pectin is further converted into galacturonic acid. The product is condensed with carbazole in a strong acid to form a purple-red compound, which has a characteristic absorption peak at 530 nm.
Self Provided：
Table centrifuge, spectrophotometer, water bath, concentrated sulfuric acid, mortar/homogenizer, 1 mL glass cuvette, adjustable pipette and distilled water.
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