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Ionic liquid treated cellulose-based intelligent pH-responsive color indicator film, with excellent anti-ultraviolet function
Three instant pH-responsive intelligent chromogenic indicator films were fabricated by ionic liquid regenerated cellulose and introduction of shikonin with solution-casting method. The sensitive color change of the indicator film from reddish purple to light bluish purple could be observed in three...
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Published in: | Journal of polymer research 2023-09, Vol.30 (9), Article 343 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Three instant pH-responsive intelligent chromogenic indicator films were fabricated by ionic liquid regenerated cellulose and introduction of shikonin with solution-casting method. The sensitive color change of the indicator film from reddish purple to light bluish purple could be observed in three cellulose-based films as the pH increased. Furthermore, the stimuli-responsive color change of hemp/shikonin film is more pronounced in the narrow region from pH 5.5 to 8.5. During real-time monitoring of shrimp freshness, the utilization of hemp/shikonin indicator film revealed a highly responsive alteration in discoloration from shrimp fresh (pH = 6.7) to spoiled (pH = 7.2), without noticeable change on the appearance of the shrimp visually. Besides, the shikonin-added indicator film exhibited notable UV-light barrier property and free radical scavenging activity, as well as greater thermal stability and mechanical strength. Due to its versatility and pH stimuli-responsive color changing, this novel indicator film has great application potential in smart food packaging. |
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ISSN: | 1022-9760 1572-8935 |
DOI: | 10.1007/s10965-023-03716-4 |