Degradation of Corn Starch with NaOH/urea and Synthesis of DS-G-AA Copolymers

Abstract

Properties of corn starch dissolved in NaOH/urea aqueous solutions were studied in this research, and NaOH/urea at different ratios in aqueous system was used to treat corn starch (CS). NaOH/urea breaks down the structure of CS, resulting in chemical degradation. After degradation, the change of molecular weight was analyzed by GPC-MALLS. The degraded CS (DS) and native CS(NS) were grafted with acrylic acid and compared in FTIR and both DS and NS were successfully grafted with AA.

Modified Starch of Amorphophalluscampanulatus as a Novel Adsorbent for Wateradsorption

“…Adding sodium hydoxide is the one of chemical modification. Sodium hydroxide modification caused color and appearance changing of adsorbents (Zhou et al, 2012). Sample C1, C2, C3, C4, C5, C6 and C7 changed to brown from its nature color (ivory) and rougher than sampel A and B.…”

The role of urea on the dissolution of starch in NaOH–urea aqueous solutions

“…As early as in 1983, Maher 18 found that starch could be dissolved in NaOH aqueous solutions at room temperature, but it would be degraded to some extent in strong alkali solutions. 19,20 Past reports from our laboratory showed that potato starch can be effectively dissolved in 10–14% w/w NaOH aqueous solutions within 5–10 min. By altering the concentration of NaOH and the stirring time, the starch's molecular chain degraded to varying degrees.…”