| abstract |
The invention belongs to the field of food additives, and discloses a method and application for grading extraction of citrus pectin. After drying, the citrus peel is added to water and mixed, acid is added to adjust the pH value to 1.8-2.2, stirred and extracted at 65-75°C, and centrifuged to obtain first-grade pectin extract and first-grade pectin residue; Add into water, add acid to adjust pH value to 1.5～1.7, stir and extract at 75～85℃, centrifuge to obtain secondary pectin extract and waste residue; separate primary pectin extract and secondary pectin extract at 55 Rotary steam for 0.5 to 2.0 h at ~65°C, alcohol precipitation with 1 to 2 times the volume of ethanol solution, washing and drying to obtain first-grade pectin and second-grade pectin respectively. The invention realizes the grading extraction of pectin, solves the problem of insufficient pectin extraction at present, realizes the grading of pectin products, and realizes the multi-level diversification of pectin products. |