期刊
FOOD CONTROL
卷 131, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodcont.2021.108441
关键词
Colorimetric film; pH-sensitivity enhanced; Chondroitin sulfate; Anthocyanins; Shrimp freshness monitoring
资金
- National Natural Science Foundation of China [31972090]
- First Batch of Liaoning Unveiling Leader Scientific and Technological Projects [2021083]
- Project of Double Hundred for Major Scientific and Technological Achievements Transformation of Shenyang City [Z19-3-012]
- Scientific Research Funding Projects of Liaoning Province [LSNQN202010]
A pH-sensitive food freshness indicator film was developed using potato starch, blueberry anthocyanins, and chondroitin sulfate. The addition of chondroitin sulfate significantly improved the water solubility and mechanical properties of the film, enhancing pH and ammonia responsiveness, thereby enabling sensitive freshness monitoring.
A pH-sensitive food freshness indicator film (PS-CS-BA) was fabricated with potato starch (PS) as film-forming substrate, blueberry anthocyanins (BA) as an indicator, and chondroitin sulfate (CS) as an enhancer. The results exhibited that the presence of CS significantly altered water solubility and improved mechanical properties of films, in particular enhanced pH and ammonia responsiveness. FT-IR and XRD results associated with the enhanced pH sensitivity and colorimetry with the ionic complex between the sulfate group of CS and anthocyanin flavylium ion. When applied in monitoring shrimp freshness at 4 degrees C, the PS-CS-BA film indicated sensitively with vision recognizable color changes from original pink to light grey and finally to grayish-green, which highly correlated with the deterioration indexes of the total volatile basic nitrogen (TVB-N), total viable count (TVC), and pH values of shrimp. The results provided a novel and highly-sensitive intelligent packaging strategy by the co-pigmentation of CS for freshness monitoring.
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