Study on purification of sweet potato pectin

Sweet potato pectin was decolorizated with activated carbon, diatomite, ultrafiltration and ion exchange resin. The protein was hydrolyzed by protease. The result showed that better decolorization conditions were: activated carbon dosage 2.0%, temperature 50℃, time 40min. The reflux rate was 85% to 92% with ultrafiltration membrane decolorization. The process was simple and of low cost. The other small molecule was also removed during this process. It was also suitable for industrial continuous production.