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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

VALDERRAMA BOHORQUEZ, Nathalia; ALGECIRA ENCISO, Néstor Ariel  e  ALBARACIN HERNANDEZ, William. Effect of the storage on the color of chitosan films. Polímeros [online]. 2016, vol.26, n.spe, pp.25-36.  Epub 19-Jan-2016. ISSN 1678-5169.  http://dx.doi.org/10.1590/0104-1428.1993.

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.

Palavras-chave : food additives; modified polymers; chitosan.

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