{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T12:03:05Z","timestamp":1791460985087,"version":"4.3.4"},"reference-count":47,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2017,5,5]],"date-time":"2017-05-05T00:00:00Z","timestamp":1493942400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Natural extracts possess several kinds of antioxidants (anthocyanins, betalains, thymol, carvacrol, and resveratrol) that have also demonstrated antimicrobial properties. In order to study these properties, extracts from cranberry, blueberry, beetroot, pomegranate, oregano, pitaya, and resveratrol (from grapes) were obtained. Growth inhibition tests of mesophilic aerobes, coliforms, and fungi were conducted in films prepared from the extracts in accordance with Mexican Official Norms (NOM). Optical properties such as transparency and opacity, mechanical properties, and pH were also analyzed in these materials. The films with beetroot, cranberry, and blueberry extracts demonstrated the best antimicrobial activity against various bacteria and fungi in comparison with unmodified chitosan\u2013starch film. This study shows that the addition of antioxidants improved the antimicrobial performance of these films. It was also found that antimicrobial properties are inherent to the films. These polymers combined with the extracts effectively inhibit or reduce microorganism growth from human and environmental contact; therefore, previous sterilization could be unnecessary in comparison with traditional plastics. The presence of extracts decreased transmittance percentages at 280 and 400 nm, as well as the transparency values, while increasing their opacity values, providing better UV\u2013VIS light barrier properties. Despite diminished glass transition temperatures (Tg), the values obtained are still adequate for food packaging applications.<\/jats:p>","DOI":"10.3390\/ijms18050997","type":"journal-article","created":{"date-parts":[[2017,5,5]],"date-time":"2017-05-05T10:31:08Z","timestamp":1493980268000},"page":"997","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":103,"title":["Antimicrobial, Optical and Mechanical Properties of Chitosan\u2013Starch Films with Natural Extracts"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1519-5608","authenticated-orcid":false,"given":"Jessica","family":"Lozano-Navarro","sequence":"first","affiliation":[{"name":"Tecnol\u00f3gico Nacional de M\u00e9xico-Instituto Tecnol\u00f3gico de Ciudad Madero, Centro de Investigaci\u00f3n en Petroqu\u00edmica, Prolongaci\u00f3n Bah\u00eda de Aldair, Ave. de las Bah\u00edas, Parque de la Peque\u00f1a y Mediana Industria, Altamira, Tamaulipas C.P. 89600, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nancy","family":"D\u00edaz-Zavala","sequence":"additional","affiliation":[{"name":"Tecnol\u00f3gico Nacional de M\u00e9xico-Instituto Tecnol\u00f3gico de Ciudad Madero, Centro de Investigaci\u00f3n en Petroqu\u00edmica, Prolongaci\u00f3n Bah\u00eda de Aldair, Ave. de las Bah\u00edas, Parque de la Peque\u00f1a y Mediana Industria, Altamira, Tamaulipas C.P. 89600, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2743-8611","authenticated-orcid":false,"given":"Carlos","family":"Velasco-Santos","sequence":"additional","affiliation":[{"name":"Tecnol\u00f3gico Nacional de M\u00e9xico-Instituto Tecnol\u00f3gico de Quer\u00e9taro, Divisi\u00f3n de Estudios de Posgrado e Investigaci\u00f3n, Av. Tecnol\u00f3gico s\/n esquina Gral. Mariano Escobedo, Col. Centro Hist\u00f3rico, Quer\u00e9taro, Quer\u00e9taro C.P. 76000, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana","family":"Mart\u00ednez-Hern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Tecnol\u00f3gico Nacional de M\u00e9xico-Instituto Tecnol\u00f3gico de Quer\u00e9taro, Divisi\u00f3n de Estudios de Posgrado e Investigaci\u00f3n, Av. Tecnol\u00f3gico s\/n esquina Gral. Mariano Escobedo, Col. 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