Journal
FOOD CHEMISTRY
Volume 390, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2022.133153
Keywords
Aggregation-induced emission; Stimuli responsive polymer; Visual detection; Ratiometric fluorescent tag; Salmon freshness
Funding
- National Key R&D Program of China [2019YFD0901605]
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This study successfully developed a fluorescent sensing label that can detect fish freshness in real-time and visually. By utilizing ratiometric response and color change, the freshness of fish can be easily identified and the volatile amines can be quantitatively measured.
Freshness is an important parameter of fish quality. This study aims to develop a ratiometric fluorescent sensing label that is responsive to volatile amines, affording real-time and visual detection of fish freshness. For developing of the sensing label, an aggregation-induced emissive (AIE) polymer was prepared from the stimuliresponsive polymer polymethacrylic acid and the AIE molecule tetraphenylethylene and coated on to filter paper with rhodamine B as an internal reference. By exploiting the ratiometric response, the freshness of fish could be identified clearly and easily according to the color of on-package label, which changes from pink (fresh) to dark blue. The difference was linearly correlated with the total volatile basic nitrogen (TVB-N, R2 = 0.995 and 0.994 at 25 degrees C and 4 degrees C, respectively) in the range of 15-25 mg/100 g for the salmon samples, which indicated that the sensing label feasibly and non-destructively quantified TVB-N.
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