{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T20:34:34Z","timestamp":1790022874269,"version":"4.0.1"},"reference-count":140,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T00:00:00Z","timestamp":1784764800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Rochester Institute of Technology Dubai"},{"id":[{"id":"https:\/\/ror.org\/00v4yb702","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Gels"],"abstract":"<jats:p>Nanobiochar has attracted increasing attention as a redox-active carbon nanomaterial with potential applications beyond its traditional roles in environmental remediation and adsorption technologies. When integrated into hydrogel matrices, nanobiochar may provide a unique combination of physicochemical and biological functionalities, including reactive oxygen species (ROS) modulation, antimicrobial activity, high adsorption capacity, and localized therapeutic delivery. Such properties are particularly relevant to emerging wound-healing and regenerative medicine applications; however, the biological mechanisms governing the performance of nanobiochar\u2013hydrogel systems remain poorly understood. Because direct studies on nanobiochar\u2013hydrogel therapeutic systems remain scarce, this review integrates evidence from the limited nanobiochar literature together with evidence from studies on conventional biochar, hydrogel biomaterials, and related carbon nanomaterial to critically evaluate emerging biological mechanisms and identify future research priorities. This review combines bibliometric analysis with mechanistic evaluation to assess the potential of nanobiochar\u2013hydrogel systems as therapeutic biomaterials while highlighting critical knowledge gaps limiting their development. Bibliometric findings reveal that research on biochar\u2013hydrogel composites is dominated by environmental remediation, adsorption processes, and material characterization, whereas investigations addressing biological responses and therapeutic functionality remain limited. Building upon these observations, this review examines nanobiochar surface chemistry, electron transfer behavior, and redox-active properties that may influence ROS regulation at biological interfaces. Particular emphasis is placed on biointerface interactions, including protein adsorption, protein corona formation, cellular uptake pathways, and the influence of hydrogel-mediated exposure on biological responses. The review further evaluates potential antimicrobial mechanisms, redox-sensitive signaling pathways, cytocompatibility assessment strategies, and the behavior of nanobiochar-containing systems under physiologically relevant conditions. Current evidence indicates a strong reliance on chemical antioxidant assays and short-term viability measurements, while mechanistic investigations involving intracellular ROS regulation, inflammatory signaling, mitochondrial function, and gene expression responses remain scarce. Collectively, the literature discussed in this article highlights the substantial gap between material development and biological validation and provides a framework for future studies aimed at evaluating the suitability of nanobiochar\u2013hydrogel systems for wound-healing and regenerative applications.<\/jats:p>","DOI":"10.3390\/gels12080660","type":"journal-article","created":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T09:11:26Z","timestamp":1784797886000},"page":"660","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Emerging Nanobiochar \u2013Hydrogel Therapeutic Systems: Redox Modulation, Biointerface Interactions, and Critical Gaps in In Vitro Evaluation"],"prefix":"10.3390","volume":"12","author":[{"given":"Vidhya Sunil","family":"Bhaskarakurup","sequence":"first","affiliation":[{"name":"Department of Math & Sciences, Rochester Institute of Technology (RIT), Dubai 345055, United Arab Emirates"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leena","family":"Thomas","sequence":"additional","affiliation":[{"name":"Department of Math & Sciences, Rochester Institute of Technology (RIT), Dubai 345055, United Arab Emirates"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-6675-1090","authenticated-orcid":false,"given":"Rawan","family":"Abusirdaneh","sequence":"additional","affiliation":[{"name":"Department of Math & Sciences, Rochester Institute of Technology (RIT), Dubai 345055, United Arab Emirates"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5731-1350","authenticated-orcid":false,"given":"Dali Vilma","family":"Francis","sequence":"additional","affiliation":[{"name":"Department of Math & Sciences, Rochester Institute of Technology (RIT), Dubai 345055, United Arab Emirates"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2572-7682","authenticated-orcid":false,"given":"Rema M.","family":"Amawi","sequence":"additional","affiliation":[{"name":"Department of Math & Sciences, Rochester Institute of Technology (RIT), Dubai 345055, United Arab Emirates"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"693","DOI":"10.1039\/D4SE01393J","article-title":"Biomass-Derived Carbon Materials for Sustainable Energy Applications: A Comprehensive Review","volume":"9","author":"Khandaker","year":"2025","journal-title":"Sustain. 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