When high amylose (70% amylose) corn starch, is gelatinized in the presence of hydrophobic ligands an amylose inclusion complex (AIC) can form. With cooling, the amylose fraction wraps around the ligand to form the AIC. These AICs will typically be composed of 95% starch and 5% ligand. Normally when either component is on its own, they will come out of water solution by either forming a gel or a precipitate. However, when combined as an AIC, they form a colloidal suspension and stay in solution. AICs formed from fatty sodium salts or fatty ammonium salts were found to be effective at modifying the properties of cellulosic films. Hydroxypropyl methylcellulose (HPMC) is a widely used water soluble cellulosic polymer. Its utility can be increased by blending HPMC with AICs. The properties of the HPMC / AIC blended films is dependent on the ratio of each component used and which charged ligand is used. Fatty acid salt AICs provide higher value HPMC films with a better balance of physical properties, and decreased gas permeability. Fatty ammonium salt AICs blended HPMC films have decreased gas permeability and have an anti-microbial surface. The incorporation of readily made inexpensive AICs into HPMC provide a novel route to increase the value of HPMC films.

New high performance hydroxylpropyl methyl cellulose films using amylose inclusion complexes

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