Citation: WANG Yue, FAN Liu-Yin. Intelligent Indicator Film for Visual Meat Freshness Monitoring[J]. Chinese Journal of Analytical Chemistry, ;2023, 51(1): 139-145. doi: 10.19756/j.issn.0253-3820.221161 shu

Intelligent Indicator Film for Visual Meat Freshness Monitoring

WANG Yue ^1,2 ,
FAN Liu-Yin ^1,,

1.
Student Innovation Center, Shanghai Jiaotong University, Shanghai 200240, China;
2.
School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 200240, China

Corresponding author: FAN Liu-Yin, lyfan@sjtu.edu.cn
Received Date: 2 April 2022
Revised Date: 7 July 2022

Fund Project: Supported by the National Natural Science Foundation of China (No.22074091).

Three different pH-sensitive colorants including cyanidin cation (CC), bromothymol blue/methyl red (BTB/MR) and bromocresol purple (BCP) were respectively incorporated into polyvinyl alcohol (PVA) matrix to prepare intelligent indicator films by electrospinning for visual meat freshness monitoring. The morphology of films captured by scanning electron microscopy indicated that colorants had been successfully dispersed into PVA matrix and could be more sensitive due to the high specific surface area offered by the nanofiber structure. Each indicator film exhibited an obvious color response to volatile ammonia with a color difference value (△E) greater than the lowest distinguishable value (△E=7) when the mass fraction of colorant was increased to 3%. Color changes of intelligent indicator films during the minced pork freshness monitoring could be clearly observed by naked eyes and the corresponding △E calculated according to the lightness (L), redness (a) and yellowness (b) of indicator films and total volatile basic nitrogen (TVB-N) contents determined by an automated Kjeldahl apparatus were positively correlated, which suggested that the intelligent indicator films could accurately indicate the freshness and held great promise in the application of rapid and real-time monitoring of meat freshness.
- Freshness,
- Visualization,
- Intelligent indicator film,
- Polyvinyl alcohol,
- Electrospinning
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