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The obtained KBC was incorporated into reprocessed poly(lactic acid) (rPLA) films as a reinforcing filler. Cauliflower stem powder (CS) was also evaluated for comparison. Films containing 1 and 3 wt.% of each filler were characterized in terms of their mechanical, thermal, physicochemical, and morphological properties, surface wettability, water vapor barrier properties, antioxidant activity using a fatty food simulant, and disintegration under laboratory-scale composting conditions. The results showed that both fillers reduced the mechanical strength of the films without significantly affecting their thermal transitions, chemical structure, or surface wettability. rPLA-KBC-reinforced films exhibited the best overall performance for the intended use, with lower reductions in mechanical and barrier properties and providing antioxidant activity to rPLA-based systems, reaching radical scavenging activities of approximately 15% and 26% for films containing 1 and 3 wt.% of KBC, respectively. In addition, all formulations completely disintegrated under composting conditions within approximately 21 days. These findings demonstrate the potential of combining agricultural and industrial waste to develop sustainable antioxidant rPLA-based materials for food packaging applications.<\/jats:p>","DOI":"10.3390\/polym18192390","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T10:59:25Z","timestamp":1790765965000},"page":"2390","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Development of Antioxidant Composites Based on Reprocessed PLA Reinforced with Bacterial Cellulose Obtained from Kombucha Fermentation in an Infusion of Cauliflower Stems"],"prefix":"10.3390","volume":"18","author":[{"given":"Daniela A.","family":"Cerro","sequence":"first","affiliation":[{"name":"Departamento de Ingenier\u00eda Qu\u00edmica Industrial y del Medio Ambiente, Escuela T\u00e9cnica Superior de Ingenieros Industriales, Universidad Polit\u00e9cnica de Madrid (ETSII-UPM), 28006 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"}]},{"given":"Pedro","family":"Pacios","sequence":"additional","affiliation":[{"name":"Departamento de Ingenier\u00eda Qu\u00edmica Industrial y del Medio Ambiente, Escuela T\u00e9cnica Superior de Ingenieros Industriales, Universidad Polit\u00e9cnica de Madrid (ETSII-UPM), 28006 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"}]},{"given":"\u00c1ngel","family":"Ag\u00fcero Rodr\u00edguez","sequence":"additional","affiliation":[{"name":"Departamento de Ingenier\u00eda Qu\u00edmica Industrial y del Medio Ambiente, Escuela T\u00e9cnica Superior de Ingenieros Industriales, Universidad Polit\u00e9cnica de Madrid (ETSII-UPM), 28006 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7263-2344","authenticated-orcid":false,"given":"Eva","family":"Hern\u00e1ndez-Garc\u00eda","sequence":"additional","affiliation":[{"name":"Departmental Section of Galenic Pharmacy and Food Technology, Veterinary Faculty, Complutense University of Madrid, Av. 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