Preparação e caracterização de filmes binários de carboximetilcelulose/pva com vanilina e avaliação da aplicação em alimentos

Abstract

ABSTRACT Often occurs in the world in cases of food poisoning, arising from pathogenic microorganisms. And that problem that is our world are the proven environmental impacts of synthetic polymers, such as PET bottles, plastic bags and other materials, has been growing every day. In view of these two problems, the objective of this study was to develop binary carboxymethylcellulose (CMC) and poly (vinyl alcohoL) (PVA) films, incorporating vanillin, and showed to be a packaging of an indicator package of pathogenic bacteria. The films were characterized by their general appearance, visual and thickness, their swelling, infrared spectroscopy (FTIR), mechanical properties, contact angle, optical microscopy and proof of concept. In the swelling analysis it can be observed that the control film (without distortion) absorbed a greater amount of fluid in its polymer networks than the indicator, the control film reached 1159.18% swelling in 1 min time and reached a equilibrium in the range of 600% and the indicator reached the value of 967.52% in time 0.5 min and reaching a balance in the range of 5 In the same of the high frequency in the same of 3316 cm-1 and groups of CH, C = C that are characteristic of aromatic structures and when added to the film there were no significant changes to the indicator film when compared to the control. When analyzing the mechanical characteristics of the films the RTmax of the control film obtained the average of 6.89 MPa and of the indicator of 4.74 MPa, Fmax the control film reached the average 14,4 N and the indicator of 9,23 N. In There was no significant difference (p >0.05) with respect to stretching, and from the Young's modulus it was observed that the film with greater stiffness was the control film. At the contact angle both are in the range below 90 °, ie the two are hydrophilic. In the optical microscopy analysis, both control and indicator films did not differ significantly when their texture characteristics were analyzed. In the test of activation of the indicator films in a bovine meat showed a color change in different temperatures contamination and with the colorimetric analysis it is possible to quantify this color in a scale of brown tones, being able to be a future intelligent packaging indicative of contamination.