The extraction conditions of pectin from Hongjiang orange peel were studied by salting-out and acid –hydrolysis methods and the product quality was analyzed. Al2(SO4)3 was found as the best precipitator and the optimal acid extraction conditions were shown as follows: the ratio of water to materials of 10:1, pH value of 2.0, temperature of 85 ℃, and extraction time of 120 min. For salting out of the extracts, the best volume of Al2(SO4)3 saturated solution, pH value, temperature and time were 5mL per 100g pectin extracts, 7.0, 75 ℃, and 60 min, respectively. The crude pectin was then desalted by the mixture of HCl, ethanol and water (VHCl/V乙醇/V水=47/50/3) for 30 min with its content of 20 mL/g pectin. Under those conditions, the yield of pectin was 6.70% with the galacturonoglycan content, methoxyl content and gelatination degree being of 47.3%, 33.3% and 109, respectively.
