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Int J Mol Sci ; 18(5)2017 May 05.
Artigo em Inglês | MEDLINE | ID: mdl-28475151

RESUMO

Natural extracts possess several kinds of antioxidants (anthocyanins, betalains, thymol, carvacrol, and resveratrol) that have also demonstrated antimicrobial properties. In order to study these properties, extracts from cranberry, blueberry, beetroot, pomegranate, oregano, pitaya, and resveratrol (from grapes) were obtained. Growth inhibition tests of mesophilic aerobes, coliforms, and fungi were conducted in films prepared from the extracts in accordance with Mexican Official Norms (NOM). Optical properties such as transparency and opacity, mechanical properties, and pH were also analyzed in these materials. The films with beetroot, cranberry, and blueberry extracts demonstrated the best antimicrobial activity against various bacteria and fungi in comparison with unmodified chitosan-starch film. This study shows that the addition of antioxidants improved the antimicrobial performance of these films. It was also found that antimicrobial properties are inherent to the films. These polymers combined with the extracts effectively inhibit or reduce microorganism growth from human and environmental contact; therefore, previous sterilization could be unnecessary in comparison with traditional plastics. The presence of extracts decreased transmittance percentages at 280 and 400 nm, as well as the transparency values, while increasing their opacity values, providing better UV-VIS light barrier properties. Despite diminished glass transition temperatures (Tg), the values obtained are still adequate for food packaging applications.


Assuntos
Anti-Infecciosos/farmacologia , Quitosana/química , Frutas/química , Extratos Vegetais/farmacologia , Amido/química , Anti-Infecciosos/síntese química , Anti-Infecciosos/química , Aspergillus/efeitos dos fármacos , Enterobacteriaceae/efeitos dos fármacos , Fenômenos Mecânicos , Fenômenos Ópticos , Penicillium/efeitos dos fármacos , Extratos Vegetais/química
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