Preparation and Characterization of Colorimetric Indicator Films Based on Chitosan/Polyvinyl Alcohol and Anthocyanins fr
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ORIGINAL PAPER
Preparation and Characterization of Colorimetric Indicator Films Based on Chitosan/Polyvinyl Alcohol and Anthocyanins from Agri‑Food Wastes Cristiane Capello1 · Thalles Canton Trevisol1 · Jaine Pelicioli1 · Manoela Bernardes Terrazas1 · Alcilene Rodrigues Monteiro1 · Germán Ayala Valencia1 Accepted: 17 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This work aimed to compare the potential application of anthocyanins extracted from jabuticaba fruit (Plinia cauliflora) and purple sweet potato (Ipomoea Batatas L.) peels as potential raw materials to manufacture colorimetric indicator films. The effect of anthocyanin source on morphology, thickness, moisture content, hydrophobicity, solubility in water, chemical structure, thermal properties, color, and opacity of films was analyzed. Furthermore, color change of films when exposed to controlled visible light and their application to monitoring meat freshness at three temperatures (− 20, 4, and 20 °C) was studied. Anthocyanins from both agri-food wastes increased the molecular spacing in the polymer chains, increasing thickness values and decreasing the thermal stability of the films. However, this effect was more evident when anthocyanins from purple sweet potato peels were used. The other physicochemical properties of colorimetric films were not altered with the presence of anthocyanins. Both colorimetric indicator films showed visible changes from red color to blue color when used to monitor meat freshness at the proposed storage temperatures. Based on physicochemical and colorimetric results, jabuticaba peel is an interesting agri-food waste to manufacture colorimetric indicator films for the food packaging sector. Keywords Agri-food valorization · Biopolymers · Food pigment · pH freshness indicator · Food industry
Introduction The valorization of agri-food wastes is one of the main objectives of agroindustry sector in the last years due to the great potential of these materials to provide economic, environmental, and social benefits. In this sense, several countries are already promoting strategies for the valorization of agri-food waste under the concept of green economies taking into consideration the food manufacturing industry [1, 2].
Jaine Pelicioli and Manoela Bernardes Terrazas are equal contributors. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10924-020-01978-3) contains supplementary material, which is available to authorized users. * Germán Ayala Valencia [email protected] 1
Department of Chemical and Food Engineering, Federal University of Santa Catarina, Florianópolis, SC, Brazil
In parallel, the food packaging sector is exploring new concepts as consequence to the growing concerns of consumers involving safety and quality of food products. New food packaging using intelligent materials can communicate information about food quality during storage by means of the interaction between the intelligent material with the intern
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