Ultrafine fibers of zein and anthocyanins as natural pH indicator.

• Autores: Luciana Prietto, Vania Zanella Pinto, Shanise Lisie Mello El Halal, Michele Greque de Morais, Jorge Alberto Vieira Costa, Loong-Tak Lim, Alvaro Renato Guerra Dias, Elessandra da Rosa Zavareze
• Localización: Journal of the science of food and agriculture, ISSN 0022-5142, Vol. 98, Nº 7, 2018, págs. 2735-2741
• Idioma: inglés
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• Resumen

  • pH-sensitive indicator membranes, which are useful for pharmaceutical, food, and packaging applications, can be formed by encapsulating halochromic compounds within various solid supports. Accordingly, electrospinning is a versatile technique for the development of these indicators, by entrapping pH dyes within ultrafine polymer fibers.; Results: The ultrafine zein fibers, containing 5% (w/v) anthocyanins, had an average diameter of 510 nm. The pH-sensitive membrane exhibited color changes from pink to green when exposed to acidic and alkaline buffers, respectively. The contact angle was negligible after 10 and 2 s for neat and 5% anthocyanin-loaded zein membranes, respectively.; Conclusion: The pH membranes exhibited color changes in a board pH range, which can potentially be used in various active packaging applications. © 2017 Society of Chemical Industry.; © 2017 Society of Chemical Industry.