玉米醇溶蛋白和花青素的超细纤维作为天然pH指示剂。
Ultrafine fibers of zein and anthocyanins as natural pH indicator.
作者信息
Prietto Luciana, Pinto Vania Zanella, El Halal Shanise Lisie Mello, de Morais Michele Greque, Costa Jorge Alberto Vieira, Lim Loong-Tak, Dias Alvaro Renato Guerra, Zavareze Elessandra da Rosa
机构信息
Department of Agroindustrial Science and Technology, Federal University of Pelotas, Pelotas, Brazil.
Laboratory of Microbiology and Biochemistry, College of Chemistry and Food Engineering, Federal University of Rio Grande, Rio Grande, Brazil.
出版信息
J Sci Food Agric. 2018 May;98(7):2735-2741. doi: 10.1002/jsfa.8769. Epub 2017 Dec 5.
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.
背景
pH敏感指示膜可通过将卤色化合物封装在各种固体载体中形成，在制药、食品和包装应用中很有用。因此，静电纺丝是开发这些指示剂的一种通用技术，可将pH染料截留在超细聚合物纤维中。
结果
含有5%（w/v）花青素的玉米醇溶蛋白超细纤维平均直径为510nm。该pH敏感膜在分别暴露于酸性和碱性缓冲液时，颜色从粉红色变为绿色。纯玉米醇溶蛋白膜和负载5%花青素的玉米醇溶蛋白膜的接触角分别在10秒和2秒后可忽略不计。
结论
该pH膜在很宽的pH范围内呈现颜色变化，有可能用于各种活性包装应用。©2017化学工业协会。
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