Preparation and properties of the succinic ester of porous starch

• Published in: Carbohydrate polymers 2012-04, Vol.88 (2), p.604-608
• Main Authors: Chang, Peter R., Qian, Dayan, Anderson, Debbie P., Ma, Xiaofei
• Format: Article
• Language: English
• Subjects: Adsorption; Applied sciences; Exact sciences and technology; Natural polymers; Physicochemistry of polymers; Porous starch; Starch and polysaccharides; Succinic anhydride
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2012.01.001

► PS was prepared using a freezing-solvent exchange technique. ► The reactive PS was modified by SA in a solvent/catalyst-free medium. ► The linear relation DS=0.0224+1.3099 (molar ratio). ► Effect of DS on pore structure, apparent density, moisture, oil and dye adsorption. ► The MB adsorption process fitted the pseudo second-order model. Porous starch (PS) was prepared by replacing ice crystals in frozen starch gel with ethanol using a solvent exchange technique. It was then modified by succinic anhydride (SA) in a solvent/catalyst-free medium, and the obtained SA-modified PSs (SAPSs) were characterized. The degrees of substitution (DSs) of SA could be controlled by changing the SA/starch molar ratios. A high linear relationship (>0.99) between the DS and molar ratio was found. The effect of different DSs (0–1.90) on the pore size, apparent density, moisture adsorption, oil adsorption capacity and methylene blue (MB) adsorption of SAPSs was investigated. Apparent density, oil adsorption capacity and methylene blue (MB) adsorption of SAPSs increased gradually with the increasing DSs. SAPSs exhibited higher moisture content at equilibrium than PS. In addition, the adsorption of MB by SAPSs could be described well by a pseudo second-order model.