Preparation of controllable porous starch with different starch concentrations by the single or dual freezing process

Publication year: 2011
Source: Carbohydrate Polymers, In Press, Accepted Manuscript, Available online 13 June 2011

Dayan, Qian , Peter R., Chang , Xiaofei, Ma

Porous starch (PS) was created by replacing ice crystals in frozen starch gel with ethanol using a solvent exchange technique. In the single freezing process, the porous structures of PSs were controlled by changing the starch paste concentrations. With the increasing of concentrations from 5 to 20%, pore size, moisture adsorption, oil adsorption capacity and methylene blue (MB) adsorption of PSs decreased greatly, while the apparent density increased from 0.093 to 0.689g/cm3. In the dual freezing process, the porous structures of citric acid-modified PS (CAPS0) was full of starch pastes with different concentrations (1.5, 2.5 and 3.5%), and then frozen…

 Highlights: ► In SFP, the porous structures of PSs were controlled by changing the starch paste concentrations. ► In DFP, starch pastes were filled in the pores of citric acid modified PS from SFP, and then frozen again. ► The effects of starch concentrations on pore structure, apparent density, moisture, oil and dye adsorption were investigated.