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- W4288045100 abstract "In this study, colorimetric indicator films (CIFs) were developed by integrating neutral red covalently immobilized onto TEMPO-oxidized cellulose nanofibrils (NR@TOCNFs) and poly(acrylic acid) (PAA) inside a poly(vinyl alcohol) (PVA) matrix. The successful covalent immobilization of NR onto the TOCNFs was confirmed using attenuated total reflection-Fourier transform infrared, X-ray photoelectron spectroscopy, and thermogravimetric analyses. The CIFs had a visible color change from red to yellow as the pH changed from 2.0 to 10.0. The colorimetric response of CIFs improved as the NR@TOCNF content increased, while it decreased as the PAA level increased. The critical pH ranges for the color change of CIFs were 6-7, 7-8, and 8-9 for 3 %, 5 %, and 7 % PAA, respectively, at 0.3 % NR@TOCNF. The best ammonia sensitivity was found in the indicator films containing 3 % PAA and 0.3 % NR@TOCNF. These results showed that the CIFs could be applied for freshness detection in food packaging." @default.
- W4288045100 created "2022-07-27" @default.
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- W4288045100 date "2022-11-01" @default.
- W4288045100 modified "2023-09-26" @default.
- W4288045100 title "Intelligent pH- and ammonia-sensitive indicator films using neutral red immobilized onto cellulose nanofibrils" @default.
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- W4288045100 doi "https://doi.org/10.1016/j.carbpol.2022.119910" @default.
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