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Ultrafine fibers of zein and anthocyanins as natural pH indicator
Author(s) -
Prietto Luciana,
Pinto Vania Zanella,
El Halal Shanise Lisie Mello,
de Morais Michele Greque,
Costa Jorge Alberto Vieira,
Lim LoongTak,
Dias Alvaro Renato Guerra,
Zavareze Elessandra da Rosa
Publication year - 2018
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8769
Subject(s) - membrane , electrospinning , chemistry , anthocyanin , polymer , chemical engineering , contact angle , food packaging , ph indicator , organic chemistry , food science , biochemistry , engineering
BACKGROUND 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