Abstract
Colorimetric indicator gels were developed by incorporating anthocyanin (AC) obtained from red cabbage into poly (ethylene glycol) diacrylate (PEGDA)-based hydrogel containing lignocellulose nanofiber (LCNF). The PEGDA-based hydrogel was prepared by mixing all of the mentioned components at the specific composition, and the hydrogels were cured under UV light (245 nm) for 1 min. The pH-response, UV absorption, swelling ratio, and mechanical properties of PEGDA/LCNF were determined. It was further found that PEGDA and LCNF mount play an important role in adjusting the mechanical properties of PEGDA/LCNF. In general, the presence of LCNF improved the mechanical properties and swelling ratio of PEGDA. The incorporation of red cabbage anthocyanin into the PEGDA/LCNF film showed multicolor response when specific pH buffers were introduced. Based on the multicolor response of PEGDA/LCNF/CA, this gel film indicator can be developed as a food freshness indicator that focuses on the detection of ammonia and amine compound.
Highlights
Nowadays, the colorimetric pH indicator has become an interesting topic; it can be developed as a useful product to monitor the freshness of food by applying it as an intelligent packaging or placing it inside the packaging
The controllable hydrogel was successfully prepared by mixing the gel-like texture of lignocellulose nanofiber (LCNF) and poly (ethylene glycol) diacrylate (PEGDA)
The compression modulus of PEGDA/LCNF was found to increase up to 69% with the increase in LCNF amount
Summary
The colorimetric pH indicator has become an interesting topic; it can be developed as a useful product to monitor the freshness of food by applying it as an intelligent packaging or placing it inside the packaging. A consumer can quickly determine the food quality without opening the food packaging. The application of this colorimetric indicator can lead to a better life, especially from the aspect of food quality, and could reduce the amount of food waste. Biodegradable materials are chosen owing to their properties, e.g., environmentally friendly, non-toxic, and decompose in a short amount of time [1,2,3]. These biodegradable materials can be in the form of carbohydrate, protein, and other macromolecules
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