title: Effect of amylose content and nanoclay incorporation order in physicochemical properties of starch/montmorillonite composites.
abstract: The effects of the amylose content and the preparation sequence in physicochemical properties of starch/montmorillonite (MMT) composites were studied in this work. Native (30%) and high amylose Hylon VII (70%) starches were considered for assessing the effects of amylose content. Glycerol and MMT were used as additives to evaluate the effects of the former as plasticizer and the latter as reinforcer. The glycerol was incorporated before (Method M1) and after (Method M2) the addition of MMT. FTIR studies indicated that water bonding was affected by amylose content. Sorption isotherms indicated that method M2 favoured water adsorption and method M1 reduced water adsorption due to competition for active sites for interaction. TGA showed that method M1 induced a higher degradation rate than method M2. Wettability analysis by contact angle measurements showed that plasticizer promoted the hydrophilicity of the film, whereas MMT promoted a hydrophobic surface for both cases of amylose content.
authors: Centro de Desarrollo de Productos Bióticos del Instituto Politécnico Nacional, Km 8.5, Carretera Yautepec Jojutla, Colonia San Isidro, Apartado Postal 24, 62731 Yautepec, Morelos, Mexico; Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Cerro Blanco No. 141. Col. Colinas del Cimatario, Santiago de Querétaro, Querétaro, 76090, Mexico.
authors: C A
authors: CA
authors: Romero-Bastida
authors: Facultad de Filosofia Ciencias e Letras de Ribeirao Preto, Departamento de Química, Universidad de Sao Paulo, Av. Bandeirantes 3900, CEP 14040-901, Bairro Monte Alegre, Ribeirão Preto, SP, Brazil.
authors: D R
authors: DR
authors: Tapia-Blácido
authors: Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Cerro Blanco No. 141. Col. Colinas del Cimatario, Santiago de Querétaro, Querétaro, 76090, Mexico.
authors: G
authors: G
authors: Méndez-Montealvo
authors: Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Cerro Blanco No. 141. Col. Colinas del Cimatario, Santiago de Querétaro, Querétaro, 76090, Mexico. Electronic address: labello@ipn.com.
authors: L A
authors: LA
authors: Bello-Pérez
authors: Centro de Desarrollo de Productos Bióticos del Instituto Politécnico Nacional, Km 8.5, Carretera Yautepec Jojutla, Colonia San Isidro, Apartado Postal 24, 62731 Yautepec, Morelos, Mexico.
authors: G
authors: G
authors: Velázquez
authors: Departamento de Ingeniería de Procesos e Hidráulica, Universidad Autónoma Metropolitana-Iztapalapa, Apartado Postal 55-534, Iztapalapa, Ciudad de México, 09340, Mexico.
authors: J
authors: J
authors: Alvarez-Ramirez
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D000688:Amylose / Q000737:chemistry* / Q000494:pharmacology*; D001546:Bentonite / Q000737:chemistry*; D000077215:Clay; D008567:Membranes, Artificial; D053761:Nanocomposites / Q000737:chemistry; D010968:Plasticizers / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D013213:Starch / Q000737:chemistry*; D013818:Thermogravimetry; D014867:Water / Q000737:chemistry; D017155:Wettability; D003313:Zea mays / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D008567:Membranes, Artificial; D010968:Plasticizers; D014867:Water; D001546:Bentonite; D013213:Starch; D000688:Amylose; D000077215:Clay
keywords: Adsorption isotherms; Biodegradable films; Montmorillonite; Starch