Influence of Starch Composition and Molecular Weight on Physicochemical Properties of Biodegradable Films

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Title: Influence of Starch Composition and Molecular Weight on Physicochemical Properties of Biodegradable Films
Authors: Domene-López, Daniel | García Quesada, Juan Carlos | Martin-Gullon, Ignacio | Montalbán, Mercedes G.
Research Group/s: Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos
Keywords: TPS film | Amylose content | Molecular weight | Crystallinity | Mechanical properties
Knowledge Area: Ingeniería Química
Issue Date: 26-Jun-2019
Publisher: MDPI
Citation: Domene-López D, García-Quesada JC, Martin-Gullon I, Montalbán MG. Influence of Starch Composition and Molecular Weight on Physicochemical Properties of Biodegradable Films. Polymers. 2019; 11(7):1084. doi:10.3390/polym11071084
Abstract: Thermoplastic starch (TPS) films are considered one of the most promising alternatives for replacing synthetic polymers in the packaging field due to the starch biodegradability, low cost, and abundant availability. However, starch granule composition, expressed in terms of amylose content and phosphate monoesters, and molecular weight of starch clearly affects some film properties. In this contribution, biodegradable TPS films made from potato, corn, wheat, and rice starch were prepared using the casting technique. The effect of the grain structure of each starch on microstructure, transparency, hydration properties, crystallinity, and mechanical properties of the films, was evaluated. Potato starch films were the most transparent and corn starch films the most opaque. All the films had homogeneous internal structures—highly amorphous and with no pores, both of which point to a good starch gelatinization process. The maximum tensile strength (4.48–8.14 MPa), elongation at break (35.41–100.34%), and Young’s modulus (116.42–294.98 MPa) of the TPS films were clearly influenced by the amylose content, molecular weight, and crystallinity of the film. In this respect, wheat and corn starch films, are the most resistant and least stretchable, while rice starch films are the most extensible but least resistant. These findings show that all the studied starches can be considered suitable for manufacturing resistant and flexible films with similar properties to those of synthetic low-density polyethylene (LDPE), by a simple and environmentally-friendly process.
Sponsor: This work was partially supported by the European Commission (FEDER/ERDF), the Spanish MINECO (Ref. CTQ2016-78246-R), and Generalitat Valenciana (Project PROMETEOII/2014/007). M.G.M. acknowledges support from MINECO (Juan de la Cierva-Formación contract, Ref. FJCI-2016-28081).
ISSN: 2073-4360
DOI: 10.3390/polym11071084
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Peer Review: si
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Appears in Collections:INV - REMAN - Artículos de Revistas

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