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. 2022 Nov 25;23(23):14732.
doi: 10.3390/ijms232314732.

Ion-Modified Starch Film Enables Rapid Detection of Spoiled Fruit Juices

Shijiao Qin  1 , Yujia Wu  1 , Hao Tian  2 , Yun Liu  1 , Huan Kan  1 , Defa Hou  1 , Xu Lin  1 , Yunwu Zheng  1 , Zhifeng Zheng  3 , Can Liu  1
Affiliations

Ion-Modified Starch Film Enables Rapid Detection of Spoiled Fruit Juices

Shijiao Qin et al. Int J Mol Sci. .

Abstract

Juice, as a liquid foodstuff, is subject to spoilage and damage due to complications during transport and storage. The appearance of intact outer packaging often makes spoilage and damage difficult to detect. Therefore, it of particular importance to develop a fast, real-time material to evaluate liquid foodstuffs. In this paper, starch films with pH response characteristics are successfully prepared by inorganic ion modification by utilizing whole starch and amylopectin as raw materials. The mechanical properties, stability properties, hydrophilic properties and pH electrical signal response indices of the films are analyzed and measured. The films exhibit good electrical conductivity values with 1.0 mL of ion addition (10 mmol/L), causing the composite film to respond sensitively to solutions with varying pH values. In the test of spoiled orange juice, the full-component corn starch (CS) film has more sensitive resistance and current responses, which is more conducive for applications in the quality monitoring of juice. The results indicate that modified starch films can potentially be applied in the real-time monitoring of the safety of liquid foodstuffs.

Keywords: drink spoilage; ion modified; pH response; rapid determination; starch film.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. There are no conflict to declare.

Figures

Figure 1
Figure 1
The synthesis route of ion-modified film and the flow chart of fruit juice detection.
Figure 2
Figure 2
Tensile strength and the elongation at break of (a) CS/AgNO3 composite films and (b) CA/AgNO3 composite films; stress–strain curve of (c) CS/AgNO3 composite films, and (d) CA/AgNO3 composite films.
Figure 3
Figure 3
T SEM image of different films. (A): pure CS film, (B): CS/AgNO3-1.0 mL composite film, (C): pure CA film and (D): CA/AgNO3-1.0 mL composite film. X represents the surface topography of ABCD and X-S means the cross-section morphology.
Figure 4
Figure 4
XRD curves of (a) CS/AgNO3 composite films and (b) CA/AgNO3 composite films.
Figure 5
Figure 5
(a) Water contact angle of starch/AgNO3 composite films, (b) FTIR spectra of pure starch films and starch/AgNO3-1.0 mL composite films.
Figure 6
Figure 6
(a) XPS survey spectra, and (b) high-resolution C1s spectra of composite films.
Figure 7
Figure 7
EIS of pure starch films and starch/AgNO3-1.0 mL composite films.
Figure 8
Figure 8
Steady current at different pH value of (a) pure CS film, (b) CS/AgNO3-1.0 mL composite film, (c) pure CA film and (d) CA/AgNO3-1.0 mL composite film.
Figure 9
Figure 9
EIS (a) and Steady current (b) of starch/AgNO3-1.0 mL composite films.
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