Erlin Arda Safitri, I. Putu Mahendra, Anggi Eka Putra, M. Alvien Ghifari, Demi Dama Yanti, Yusnaidar Yusnaidar, Bambang Ariwahjoedi, Jose Alberto Mendez
Colorimetric indicator gels were developed by incorporating anthocyanin (AC) obtained from red cabbage into poly (ethylene glycol) diacrylate (PEGDA)-based hydrogel containing lignocel-lulose 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 ad-justing 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. © 2021 by the authorsLicensee MDPI, Basel, Switzerland.
Institut Teknologi Sumatera, Lampung Selatan, 35365, Indonesia; Pusat Riset dan Inovasi Sanitasi dan Kesehatan Lingkungan, Institut Teknologi Sumatera, Lampung Selatan, 35365, Indonesia; Fakultas Keguruan dan Ilmu Pendidikan, Universitas Jambi, Jambi, 36361, Indonesia; Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera, Lampung Selatan, 35365, Indonesia; Enginyeria Quimica, Universitat de Girona, Girona, 17003, Spain; Laboratori d’Enginyeria Paperera i Materials Polimers, Universitat de Girona, Girona, 17003, Spain
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