Study of curcumin diffusion by Fluorescence Recovery after Photobleaching (FRAP) in the edible film of gelatin and yam- starch
نویسندگان
چکیده
Biodegradable films with antioxidant properties have been studied in recent years. Curcumin is a polyphenol chemical obtained from turmeric extraction (Curcuma longa L.) with a range of biological activities. The objective this work was to determine diffusion coefficient of curcumin in the edible films based gelatin and yam-starch matrixes. The diffusion coefficient was determinate by Fluorescence Recovery after Photobleaching (FRAP) technique in dry film and drop oil on the film. The results showed that curcumin has lower mobility in dry films than films with drop of oil. The curcumin diffusion coefficient in the starch film was 10 times higher than gelatin film, due difference structural between matrices. Thus, due the low mobility and diffusion of curcumin in both matrices, it should be applied in food how antimicrobial barrier against external contamination. RESUMO. Em recentes anos pesquisas tem sido intensificada para o desenvolvimento de embalagens biodegradáveis com adição de antioxidantes ou antimicrobiano para aumentar a vida útil de alimentos. A Curcumina é um composto poli fenólico obtido da extração açafrão da terra (Curcuma longa L.) com amplas atividades biológicas. Este estudo tem como objetivo determinar o coeficiente de difusão e a mobilidade da curcumina em filmes comestíveis a base de amido de mandioca e gelatina. O processo de recuperação do composto foi realizado atraves da fluorescência após fotodegradação em filmes secos e com gota de óleo adicionado sobre o filme. Os resultados mostraram que a curcumina tem menor mobilidade no filme após a secagem do que na presença de gota de óleo. A coeficiente de difusão da curcumina foi aproximadamente 10 vezes maior em filme de amido do que de gelatina. A partir desse resultado, filmes com curcumina podem ser aplicados em alimentos agindo como barreira antimicrobiana para evitar contaminação externa.
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