Embalagens ativas de PLA / EVA com incorporação de polietilenoglicol e quitosana como agentes modificadores de propriedade para aplicações em embalagens de pão
DOI:
https://doi.org/10.33448/rsd-v10i9.16964Palavras-chave:
Poli(ácido lático); Polietilenoglicol; Poli(etileno-co-acetato de vinila); Quitosana; Antimicrobiano; Pão; Aplicações em embalagens.Resumo
Este trabalho teve como foco o desenvolvimento de embalagens ativas biodegradáveis com misturas de poli (ácido lático) (PLA), poli (etileno-co-vinil acetato) (EVA), polietilenoglicol (PEG) e quitosana (QUI). Foram investigadas as características morfológicas térmicas e mecânicas das misturas e, ao mesmo tempo, a atividade antifúngica da embalagem. Para avaliação da atividade antimicrobiana das misturas de PLA/EVA/PEG/QUI, as amostras foram inseridas entre fatias de pão sem conservante para avaliação de seu prazo de validade. Ao comparar entre as misturas poliméricas de PLA/EVA/PEG e PLA/EVA/PEG/QUI e o PLA puro foi possível evidenciar a miscibilidade parcial, diminuição da temperatura de transição vítrea (Tg) ao incorporar PEG nas misturas, uma diminuição na força flexural de 71% e módulo de elasticidade de 80,4% para a mistura PLA/EVA/PEG/2,5QUI, bem como um aumento no alongamento na ruptura de 153% e 392% para a tenacidade ao impacto. Um comportamento semelhante foi observado para o PLA/EVA/20PEG e PLA/EVA/PEG/5,0QUI. O filme contendo QUI entre as fatias de pão também influenciou na redução da atividade de água, e reduziu cerca de 35% na contagem de bolores e leveduras nas fatias de pão. A quitosana nas misturas com PLA/EVA/PEG apresentou potencial como agente antifúngico natural em embalagens de panificação.
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