Complexing between starch and poly (ethylene-co-acrylic acid)—a comparison of starch varieties and complexing conditions

摘要: Abstract We have prepared starch-EAA complexes from different varieties of starch under a number reaction conditions. Water dispersions at either 1 or 5% solids were combined with solutions EAA in aqueous ammonia. Mixtures air-dried, and the resulting composite films then extracted solution 1,1,2-trichloroethane, isopropanol, toluene (15:15:70, by volume) to remove uncomplexed EAA. content composites after extraction was determined FTIR. Because its inability form helical inclusion EAA, microbial polysaccharide dextran used establish Pretreatment polysaccharide-EAA methanol-water prior essential for efficient removal It also necessary that be acidified convert any residual ammonium carboxylate carboxylic acid. The amount complexed increased an increase temperature gelatinization amylose sample. Jet-cooked samples afforded highest levels complexation. Complex formation cornstarch not enhanced trace amounts lipid. Increased complexing observed if 1% as opposed solids. Under these conditions, complex potato about same cornstarch, indicating phosphate substituents do influence ability.