Biomaterial Database

Effect of the addition order and amylose content on mechanical, barrier and structural properties of films made with starch and montmorillonite. 2015

C A Romero-Bastida, and L A Bello-Pérez, and G Velazquez, and J Alvarez-Ramirez

Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Cerro Blanco No. 141, Col. Colinas del Cimatario, C.P. 76090 Santiago de Querétaro, QRO, Mexico; Centro de Desarrollo de Productos Bióticos del Instituto Politécnico Nacional, Km 8.5, Carretera Yautepec-Jojutla, Colonia San Isidro, Apartado Postal 24, 62731 Yautepec, MOR, Mexico.

This study considered the effect of amylose content (30% and 70%), montmorillonite (MMT) fraction (5 and 15%) and preparation method on mechanical and barrier properties of starch/clay nanocomposites prepared by casting. In Method 1, (30% w/w) glycerol was incorporated before starch gelatinization and MMT addition, while in Method 2 after gelatinization and MMT addition. Nanocomposites with higher amount of MMT showed the highest tensile strength and Young's modulus for both preparation methods. Method 1 favored nanocomposite properties of films with less amylose content, meanwhile Method 2 favored nanocomposites properties with higher amylose content. Water vapor permeability did not decrease significantly in starch films with different amylose content with the two different preparation methods. X-ray diffraction of the starch films indicated intercalated structures. Higher melting temperature (Tm) was found for nanocomposites with Method 2, indicating more ordered structures. Films with 70% amylose content have higher Tm than films with 30% amylose.

UI	MeSH Term	Description	Entries
D005990	Glycerol	A trihydroxy sugar alcohol that is an intermediate in carbohydrate and lipid metabolism. It is used as a solvent, emollient, pharmaceutical agent, or sweetening agent.	1,2,3-Propanetriol,Glycerin,1,2,3-Trihydroxypropane,Glycerine
D000688	Amylose	An unbranched glucan in starch.
D001546	Bentonite	A colloidal, hydrated aluminum silicate that swells 12 times its dry size when added to water.	Montmorillonite,Montmorrillonite
D013718	Tensile Strength	The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001)	Strength, Tensile,Strengths, Tensile,Tensile Strengths
D053761	Nanocomposites	Nanometer-scale composite structures composed of organic molecules intimately incorporated with inorganic molecules. (Glossary of Biotechnology and Nanobiotechology Terms, 4th ed)	Nanocomposite
D055119	Elastic Modulus	Numerical expression indicating the measure of stiffness in a material. It is defined by the ratio of stress in a unit area of substance to the resulting deformation (strain). This allows the behavior of a material under load (such as bone) to be calculated.	Young Modulus,Modulus of Elasticity,Young's Modulus,Elasticity Modulus,Modulus, Elastic,Modulus, Young,Modulus, Young's,Youngs Modulus