Effects of drying temperature and relative humidity on the mechanical properties of amaranth flour films plasticized with glycerol

Brazilian Journal of Chemical Engineering

D. Tapia-blácido²  P. J. Sobral¹  F. C. Menegalli² 

[1],Universidade de Campinas Faculdade de Engenharia de Alimentos Food Engineering DepartmentCampinas SP ,Brazil

关键词: Amaranth;    Edible film;    Film drying;   

DOI  :  10.1590/S0104-66322005000200012

来源: SciELO

【 摘 要 】

Biofilms are made of biopolymers. In the casting technique, biofilms are obtained by the drying of a polymer suspension in the final stage of processing. The aim of the present paper was to analyze the effect of this drying process on the mechanical properties of films produced with amaranth flour. Variables considered include glycerol content (30, 35 and 40%, g/g dry flour) and air-drying conditions (air temperatures of 30, 40 and 50ºC and relative humidities of 40, 55 and 70%). As amaranth flour films constitute a complex mixture of amylopectin and amylose as well as native protein and lipid, certain unexpected results were obtained. The toughest films were obtained at the lowest temperature and the lowest relative humidity (30ºC, 40%).

【 授权许可】

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