Water Susceptibility and Mechanical Properties of Thermoplastic Starch–Pectin Blends Reactively Extruded with Edible Citric Acid

Autor(es)

Alessandra Luzia Da Róz ^[1] ; Pricila Veiga-Santos ^[2] ; Adriane Medeiros Ferreira ^[3] ; Thaís Cristina Ribeiro Antunes ^[4] ; Fabio de Lima Leite ^[5] ; Fabio Minoru Yamaji ^[6] ; Antonio José Felix de Carvalho ^[7]

Afiliação do(s) autor(es)

^[1] Federal University of São Carlos - Brasil

^[2] Universidade Estadual Paulista. Faculdade de Ciências Agronômicas - Brasil

^[3] University of São Paulo. Department of Materials Engineering - Brasil

^[4] Federal University of São Carlos - Brasil

^[5] Federal University of São Carlos - Brasil

^[6] Federal University of São Carlos - Brasil

^[7] University of São Paulo. Department of Materials Engineering - Brasil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 19, n. 1, p. 138-142, 2016-02-05.

Resumo

Pectin and starch are edible, non-toxic, biodegradable and obtained from renewable sources. Also, have the benefit to be easily cross-linked producing hydrogels. Reactive extrusion with edible citric acid and cross linking interactions was evaluated on extruded thermoplastic in natura and cationic starch-pectin blends. Materials water susceptibility and mechanical properties were characterised. Reactive extrusion decreased (up to 75% in natura starch) mechanical properties. Also have decreased (up to 32.4%) both starch polymers water absorption, indicating the possibility of increasing materials water barrier properties but had the opposite effect on the pectin-TPS material, probably related to a cationic-anionic cross linking, resulting in a hydrogel polymer. Reactive extrusion also have negatively affected mechanical properties of both starch polymers, however increased pectin-TPS blends stress and strain at rupture. (AU)

• Processo FAPESP: 07/08394-7 - Modificação do amido termoplástico por extrusão reativa (REX): compatibilização reativa e modificação química via despolimerização/polimerização
• Beneficiário: Antonio José Felix de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores