{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T05:00:51Z","timestamp":1790830851801,"version":"4.1.0"},"reference-count":69,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T00:00:00Z","timestamp":1790467200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Active biodegradable packaging materials capable of preserving fruit quality and reducing oxidative processes are promising alternatives to conventional petroleum-based plastics. In this study, alginate\u2013gelatin composite films were developed using a dual crosslinking strategy combining microbial transglutaminase-mediated enzymatic crosslinking with Ca2+-induced ionic gelation. The films were then enriched with Pelargonium sidoides root extract as a natural antioxidant. The combined crosslinking approach resulted in a more compact protein\u2013polysaccharide network, which was reflected in increased film density and reduced swelling. The highest density was observed for film 1.0F (\u03c1 = 1.2004 \u00b1 0.0151 g\/cm3), while films containing Ca2+ showed lower swelling values, with SI60 decreasing from 7655 \u00b1 70 for 0F to 5853 \u00b1 49 for 0Ca2+F. The addition of the extract promoted additional interactions within the polymer matrix and affected the swelling and barrier properties of the films. The WVTR values were 36.1 \u00b1 0.9 g\/m2\u00b724 h for 1.0F and 49.8 \u00b1 1.5 g\/m2\u00b724 h for 1.0Ca2+F. The incorporation of P. sidoides extract also significantly increased the antioxidant activity of the films, particularly at higher extract concentrations. Furthermore, films containing Ca2+ and the extract contributed to the preservation of anthocyanins in Flame Seedless grapes during 14 days of storage, with the anthocyanin content reaching 0.208% \u00b1 0.019 for the 1.0Ca2+F treatment. Overall, the results indicate that dual-crosslinked alginate\u2013gelatin films enriched with P. sidoides extract have favorable physicochemical and functional properties and may be suitable for the development of sustainable active packaging materials for anthocyanin-rich fruits.<\/jats:p>","DOI":"10.3390\/polym18192356","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T10:00:34Z","timestamp":1790589634000},"page":"2356","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Development of Dual Enzymatic\u2013Ionic Crosslinked Alginate\u2013Gelatin Films Enriched with Pelargonium sidoides Extract for Active Packaging and Anthocyanin Preservation in Flame Seedless Grapes"],"prefix":"10.3390","volume":"18","author":[{"given":"Renata","family":"Dobrucka","sequence":"first","affiliation":[{"name":"Department of Non-Food Products Quality and Packaging Development, Institute of Quality Science, Poznan University of Economics and Business, al. 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