Abstract
AbstractCell wall material was isolated from the residue obtained after the extraction of sweet potato starch by treatment with the α‐amylase. The wall material was fractionated by successive extraction with various reagents. The pectic substance was mainly composed of uronic acid (47.1%) residues and contained galactose as the predominant neutral sugar residues. The hemicellulosic fraction was further fractionated by precipitation with iodine in the presence of calcium chloride to give two fractions, a iodine precipitatable‐iodine complex (HC‐IP) and a supernatant solution (HC‐IS). The HC‐IS fraction had a higher glucose content (53.4%), whereas the HC‐IP fraction had a high content of xylose residues (35.1%). The HC‐IP fraction consisted mainly of xylan, as judged by the degradation with purified xylanase.
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