Study on physicochemical properties of pomelo peel pectin

Taking pomelo peel dried powder as raw material, research of the best process to extract pomelo peel pectin which was conducted through orthogonal experiment and then to study on the physicochemical property of the pectin. It comed to a conclusion that the best condition to extract pomelo peel pectin was in the temperature of 100℃, pH2, 60min and the best solid-liquid ratio was 1∶50 (g/mL) . Under the condition, the yield of pomelo peel pectin was 27.06%. The reseach of the physicochemical property of pomelo peel pectin showed that the purity of pomelo peel pectin was 84.3%, the esterification degree of it was 73.75%. The extracted pectin was yellow, powdery bulky material. Normally, the pH of pomelo peel pectin stayed at 4.86, showed as acidity high-fat pectin, which met the standard of commercial pectin. As the temperature gone up, the solubility went down, and with the pH value gone up, the solubility tended to go down. The thermal stability of pomelo peel pectin better than commercial pectin, but manifested it dropped rapidly along with the time tended to be stable after 15min. Its viscosity went up with the increase of pectin concentration, decreased when pH and temperature went up and rose along with the increase of the concentration of sucrose. The pectin of emulsifying properties and viscosity was superior than citrus pectin. Physicochemical properties of pomelo peel pectin similar to commercial pectin that was a high quality resource.