Extraction and Physicochemical Characterization of Pectin from Sunflower Head Residues

摘要

ABSTRACTPectin was isolated from sunflower head residues, using 0.75 sodium hexametaphosphate extraction followed by acid precipitation. The yield of pectin was7.3 of the head residues. The isolated pectin contained 89.2 anhydrogalacturonic acid, 2 acetyl ester, and 4.2 neutral sugars, which were mainly rhamnose and glucose. The degree of methylation was 38.5. The pectin had a high viscosity (527 cp at 1 level) at pH 3 and a high water‐holding capacity (57g water/g organic matter). The peak molecular mass of the sunflower pectin was>523,000 dalton