1. Application of pH-indicating film containing blue corn anthocyanins on corn starch/polyvinyl alcohol as substrate for preservation of tilapia.
- Author
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Li, Jiang, Zhu, Bifen, Yu, Hongda, Yuan, Minglong, Chen, Haiyan, and Qin, Yuyue
- Subjects
CORNSTARCH ,POLYVINYL alcohol ,TILAPIA ,COMPOSITE membranes (Chemistry) ,ANTHOCYANINS ,CORN - Abstract
In this study, blue corn extract (BCE) was added to a corn starch, polyvinyl alcohol (PVA) based smart packaging indicator film. Characterization of physical properties of films by tensile test and color difference test. The color changes of BCE and corn starch/PVA/BCE composite films were investigated in the pH range of 1–14. Scanning electron microscopy images showed good compatibility of BCE with the substrate. BCE significantly increased the tensile strength, elongation at break and water content of the films (p < 0.05). The corn starch/PVA/BCE films had good color stability. The addition of BCE had no significant effect on film thickness (p < 0.05). The corn starch/PVA/BCE film underwent a significant change from red to dark purple during the film application for the preservation and storage of tilapia. The results showed that this pH sensitive film has the potential to indicate the shelf life of tilapia. Practical Application: Smart pH indicator films were prepared by mixing different ratios of blue corn extract with corn starch/PVA substrates. The effects of different ratios of BCE on the physical properties and pH sensitivity of the composite membranes were investigated. During the storage of tilapia, the composite membranes showed a clear change from red to dark purple. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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