{"id":5408,"date":"2026-02-25T09:52:01","date_gmt":"2026-02-25T02:52:01","guid":{"rendered":"https:\/\/www2.si.mahidol.ac.th\/department\/biochemistry\/?p=5408"},"modified":"2026-03-30T11:23:45","modified_gmt":"2026-03-30T04:23:45","slug":"enhanced-physical-mechanical-and-barrier-properties-of-chitosan-films-via-tannic-acid-cross-linking","status":"publish","type":"post","link":"https:\/\/www2.si.mahidol.ac.th\/department\/biochemistry\/en\/enhanced-physical-mechanical-and-barrier-properties-of-chitosan-films-via-tannic-acid-cross-linking\/","title":{"rendered":"Enhanced physical, mechanical and barrier properties of chitosan films via tannic acid cross-linking"},"content":{"rendered":"<p>Supachok Tanpichai, Kitti Yuwawech, Ekachai Wimolmala, Yanee Srimarut, <strong>Weerapong Woraprayote<\/strong>, Yuwares Malila<\/p>\n<h2 class=\"title\">Abstract<\/h2>\n<div id=\"eng-abstract\" class=\"abstract-content selected\">\n<div class=\"title\">\n<p>Growing environmental concerns over the extensive use of petroleum-based polymer packaging have spurred interest in the development of bio-based alternatives. In this work, the incorporation of tannic acid as a cross-linker into chitosan at concentrations of 0-60 wt% was explored. The resulting cross-linking between chitosan chains induced by tannic acid through hydrogen and Schiff-base covalent bonding was confirmed by X-ray photoelectron spectroscopy and gel content measurements. This significantly enhanced the films&#8217; thermal stability, water uptake, mechanical properties, and barrier properties. The cross-linking minimized the interaction between chitosan functional groups and water molecules, improving water resistance. The chitosan films with 30 wt% tannic acid displayed significant improvements in tensile stress and Young&#8217;s modulus by 74% and 110%, respectively, compared with the neat chitosan films, which were ascribed to the strong interaction between chitosan and tannic acid. In addition, the cross-linked films effectively blocked UV light transmission while maintaining transparency levels greater than 85%, offering potential protection against photo-oxidation and photo-discoloration of food produce caused by sunlight exposure. However, increasing tannic acid loading negatively affected the antibacterial properties, wettability, and appearance (increased yellowness) of the cross-linked chitosan films. Furthermore, packaging developed from these cross-linked chitosan films successfully extended the shelf life of chilies, demonstrating their application in food packaging. Compared with petroleum-based polymers and biopolymer packaging films, these cross-linked chitosan films offer promising mechanical and barrier properties and UV-shielding capability, making them a sustainable alternative for packaging applications.<\/p>\n<p><a href=\"https:\/\/repository.li.mahidol.ac.th\/items\/843bfaa7-0f3f-455e-8af9-27f70f9a0c5e\">https:\/\/repository.li.mahidol.ac.th\/items\/843bfaa7-0f3f-455e-8af9-27f70f9a0c5e<\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Supachok Tanpichai, Kitti Yuwawech, Ekachai Wimolmala, Yanee Srimarut, Weerapong Woraprayote, Yuwares Malila Abstract Growing environmental concerns over the extensive use of petroleum-based polymer packaging have spurred interest in the development of bio-based alternatives. In this work, the incorporation of tannic acid as a cross-linker into chitosan at concentrations of 0-60 wt% was explored. The resulting [&#8230;]\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-5408","post","type-post","status-publish","format-standard","hentry","category-research-innovation-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Enhanced physical, mechanical and barrier properties of chitosan films via tannic acid cross-linking - \u0e20\u0e32\u0e04\u0e27\u0e34\u0e0a\u0e32\u0e0a\u0e35\u0e27\u0e40\u0e04\u0e21\u0e35 \u0e04\u0e13\u0e30\u0e41\u0e1e\u0e17\u0e22\u0e28\u0e32\u0e2a\u0e15\u0e23\u0e4c\u0e28\u0e34\u0e23\u0e34\u0e23\u0e32\u0e0a\u0e1e\u0e22\u0e32\u0e1a\u0e32\u0e25 \u0e21\u0e2b\u0e32\u0e27\u0e34\u0e17\u0e22\u0e32\u0e25\u0e31\u0e22\u0e21\u0e2b\u0e34\u0e14\u0e25<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www2.si.mahidol.ac.th\/department\/biochemistry\/en\/enhanced-physical-mechanical-and-barrier-properties-of-chitosan-films-via-tannic-acid-cross-linking\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Enhanced physical, mechanical and barrier properties of chitosan films via tannic acid cross-linking - \u0e20\u0e32\u0e04\u0e27\u0e34\u0e0a\u0e32\u0e0a\u0e35\u0e27\u0e40\u0e04\u0e21\u0e35 \u0e04\u0e13\u0e30\u0e41\u0e1e\u0e17\u0e22\u0e28\u0e32\u0e2a\u0e15\u0e23\u0e4c\u0e28\u0e34\u0e23\u0e34\u0e23\u0e32\u0e0a\u0e1e\u0e22\u0e32\u0e1a\u0e32\u0e25 \u0e21\u0e2b\u0e32\u0e27\u0e34\u0e17\u0e22\u0e32\u0e25\u0e31\u0e22\u0e21\u0e2b\u0e34\u0e14\u0e25\" \/>\n<meta property=\"og:description\" content=\"Supachok Tanpichai, Kitti Yuwawech, Ekachai Wimolmala, Yanee Srimarut, Weerapong Woraprayote, Yuwares Malila Abstract Growing environmental concerns over the extensive use of petroleum-based polymer packaging have spurred interest in the development of bio-based alternatives. In this work, the incorporation of tannic acid as a cross-linker into chitosan at concentrations of 0-60 wt% was explored. The resulting [...]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www2.si.mahidol.ac.th\/department\/biochemistry\/en\/enhanced-physical-mechanical-and-barrier-properties-of-chitosan-films-via-tannic-acid-cross-linking\/\" \/>\n<meta property=\"og:site_name\" content=\"\u0e20\u0e32\u0e04\u0e27\u0e34\u0e0a\u0e32\u0e0a\u0e35\u0e27\u0e40\u0e04\u0e21\u0e35 \u0e04\u0e13\u0e30\u0e41\u0e1e\u0e17\u0e22\u0e28\u0e32\u0e2a\u0e15\u0e23\u0e4c\u0e28\u0e34\u0e23\u0e34\u0e23\u0e32\u0e0a\u0e1e\u0e22\u0e32\u0e1a\u0e32\u0e25 \u0e21\u0e2b\u0e32\u0e27\u0e34\u0e17\u0e22\u0e32\u0e25\u0e31\u0e22\u0e21\u0e2b\u0e34\u0e14\u0e25\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SIBBprogram\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-25T02:52:01+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-30T04:23:45+00:00\" \/>\n<meta name=\"author\" content=\"Poorintra Sakuna\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Poorintra Sakuna\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www2.si.mahidol.ac.th\\\/department\\\/biochemistry\\\/en\\\/enhanced-physical-mechanical-and-barrier-properties-of-chitosan-films-via-tannic-acid-cross-linking\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www2.si.mahidol.ac.th\\\/department\\\/biochemistry\\\/en\\\/enhanced-physical-mechanical-and-barrier-properties-of-chitosan-films-via-tannic-acid-cross-linking\\\/\"},\"author\":{\"name\":\"Poorintra Sakuna\",\"@id\":\"https:\\\/\\\/www2.si.mahidol.ac.th\\\/department\\\/biochemistry\\\/en\\\/#\\\/schema\\\/person\\\/75170c4a414d080cfd0b7428b2e0d11a\"},\"headline\":\"Enhanced physical, mechanical and barrier properties of chitosan films via tannic acid cross-linking\",\"datePublished\":\"2026-02-25T02:52:01+00:00\",\"dateModified\":\"2026-03-30T04:23:45+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www2.si.mahidol.ac.th\\\/department\\\/biochemistry\\\/en\\\/enhanced-physical-mechanical-and-barrier-properties-of-chitosan-films-via-tannic-acid-cross-linking\\\/\"},\"wordCount\":278,\"publisher\":{\"@id\":\"https:\\\/\\\/www2.si.mahidol.ac.th\\\/department\\\/biochemistry\\\/en\\\/#organization\"},\"articleSection\":[\"Research Innovation\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www2.si.mahidol.ac.th\\\/department\\\/biochemistry\\\/en\\\/enhanced-physical-mechanical-and-barrier-properties-of-chitosan-films-via-tannic-acid-cross-linking\\\/\",\"url\":\"https:\\\/\\\/www2.si.mahidol.ac.th\\\/department\\\/biochemistry\\\/en\\\/enhanced-physical-mechanical-and-barrier-properties-of-chitosan-films-via-tannic-acid-cross-linking\\\/\",\"name\":\"Enhanced physical, mechanical and barrier properties of chitosan films via tannic acid cross-linking - 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