Microwave-assisted extraction method of beet pectin

The invention discloses a microwave-assisted extraction method of beet pectin. The method comprises the following steps: 1) pretreating dried beet pellets: crushing, screening, cleaning, heating by using microwave for enzyme deactivation, and drying; 2) mixing the pretreated dried beet pellets with sodium hexametaphosphate solution, extracting beet pectin by using microwave, and filtering to acquire extracting solution; 3) decoloring and concentrating the extracting solution, adding absolute ethyl alcohol into the concentrated solution for precipitation, and collecting the precipitate to acquire solid pectin. The extraction method of the beet pectin overcomes the defect of heavy use of acid solvent in a traditional technology; the acquired pectin has high purity, small damage to molecular structure and no solvent residues; waste beet pellets in a beet sugar factory can be efficiently recycled and the added value of products is greatly improved; meanwhile, the method is simple and efficient in process and easy for industrialization.