An eco-friendly film of pH-responsive indicators for smart packaging

Red cabbage anthocyanin extract (RCAE) exhibited a higher pH sensitivity. This study aimed to develop a pH-responsive smart film based on modified cassava starch (acetylated distarch phosphate, ADSP) and RCAE. The morphological, structure, and chemical characteristics of smart films were examined us...

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Bibliographic Details
Published in:Journal of food engineering 2022-05, Vol.321, p.110943, Article 110943
Main Authors: Cheng, Meng, Yan, Xiaoran, Cui, Yingjun, Han, Minjie, Wang, Xiangyou, Wang, Juan, Zhang, Rongfei
Format: Article
Language:English
Subjects:
Anthocyanin extract
NH3 indicator
pH changes
Smart film
Starch
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Summary:Red cabbage anthocyanin extract (RCAE) exhibited a higher pH sensitivity. This study aimed to develop a pH-responsive smart film based on modified cassava starch (acetylated distarch phosphate, ADSP) and RCAE. The morphological, structure, and chemical characteristics of smart films were examined using SEM, FTIR and XRD. The properties of films were measured in terms of swelling ratio, water vapor permeability, optical, and mechanical properties. When the RCAE concentration was not higher than 30%, the anthocyanins in the RCAE formed intermolecular hydrogen bonds and electrostatic interactions with ADSP, resulting in highly dense and cohesive films. The addition of RCAE improved the barrier properties and water-resistance of films. Moreover, the color response efficiency and color stability were also investigated. The RCAE content and the color intensity were positively correlated. NH3 detection showed that the statistical function model (p 
ISSN:0260-8774
1873-5770
DOI:10.1016/j.jfoodeng.2022.110943