Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/0104-1428.1993
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Efeito do armazenamento sobre a cor de filmes de quitosana

Effect of the storage on the color of chitosan films

Bohórquez, Nathalia Valderrama; Enciso, Néstor Ariel Algecira; Hernández, William Albaracín

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Resumo

Este trabalho teve como objetivo determinar o efeito da inclusão de óleos essenciais (EOs) e do armazenamento na cor dos filmes de quitosana (CH) para os parâmetros de L*, a*, b* e ΔE. Os óleos essenciais de tomilho (TEO) e alecrim (REO) foram incluídos em concentrações de 0,5:1 e 1:1 p/p (EOs:CH), assim como suas combinações 50/50 (TEO:REO). Os filmes foram armazenados a temperaturas de 5 °C, 20 °C e, 33 °C e umidade relativa do ar de 60%, 75% e, 93% durante quatro semanas. Os parâmetros da cor foram determinados por refletância com componente especular incluído (RSIN) e por refletância com componente especular excluído (RSEX), usando seis padrões de fundos diferentes. A inclusão e o aumento da concentração de óleos essenciais, assim como o aumento do tempo, da temperatura e da umidade e o padrão de fundo alteraram os valores das variáveis resposta.

Palavras-chave

aditivos alimentares, polímeros modificados, quitosana.

Abstract

The aim of this study was to determine the effect of the thyme and rosemary essential oils (EOs) inclusion and the storage on the chitosan (CH) films color for the parameters L*, a*, b* and ΔE. The thyme (TEO) and rosemary (REO) essential oils were included in 0,5:1 and 1:1 p/p (EOs:CH), as well as their combination 50/50 (TEO:REO). The films were stored at temperatures of 5 °C, 20 °C and 33 °C and relative humidity of 60%, 75% and 93% during four weeks. The colour parameters were determined by reflectance with included specular component (RSIN) and reflectance with excluded specular component (RSEX) using six different standard backdrops. Most of the results provides that the standard backdrops, the inclusion and the increasing concentration of the essential oils, as well as the time, temperature and humidity influenced the response of the variables.

Keywords

food additives, modified polymers, chitosan.

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