Journal
FOOD PACKAGING AND SHELF LIFE
Volume 34, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.fpsl.2022.100939
Keywords
Biodegradable material; Black wolfberry anthocyanin; Visual indicator film; Color response; Freshness monitoring
Categories
Funding
- National Natural Science Foundation of China [31871866]
- Innovation of Agricultural Science and Technology of Jiangsu Province [CX (22) 2044]
- China Agriculture Research System of MOF and MARA [CARS-41]
- Inner Mongolia Autonomous Region Science and Technology Plan Project [CX (22) 2044]
- Jiangsu Procambarus Clarkia Industry Technique System [31871866]
- [JFRS-03]
- [2021GG0347]
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A smart visual indicator film was developed by introducing black wolfberry anthocyanins to a solid matrix, enhancing hydrogen-bond interactions among the polymers and improving material stability and elongation.
Natural anthocyanins are considered favorable indicators for new sensing materials because of their wide pH color range. Here, a smart visual indicator film was developed by introducing black wolfberry (BW) anthocyanins to a solid matrix composed of polyvinyl alcohol (PVOH) and methylcellulose (MC). Fourier transform infrared and X-ray showed that the introduction of BW anthocyanins enhanced hydrogen-bond interactions among the polymers and the anthocyanins were well fixed in the polymer matrix. 5 % BW could improve the stability of the PVOH/MC/BW and increase its tensile strength and breakage elongation by 63.2 % and 53.0 %, respectively. Optical observations and freshness monitoring suggested that the film loaded with 5 % BW could respond to acidic and basic vapors within 10 s and as low as 25 ppm NH3 in chicken and shrimp during storage at 4 degrees C. Therefore, PVOH/MC/BW-5% may potentially be used as a smart sensor to determine freshness in practical applications.
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