doi:10.1016/j.jddst.2025.106749engZiani, KaoutarPlou, JavierSaenz-del-Burgo, LauraGarcía, IsabelCiriza, JesúsPedraz, Jose LuisHyaluronic acid incorporation into hybrid alginate-based bioinks promotes long term viability and controlled release of 3D embedded scaffolds mesenchymal stem cells in absence of Dimethyl Sulfoxide cryoprotectantART-2025-143252Cryopreservation is critical in 3D bioprinting to ensure availability for clinical use and long-term storage. We have studied the incorporation of hyaluronic acid (Ha) into an alginate-nanocellulose bioink to enhance scaffold properties and reduce reliance on dimethyl sulfoxide (DMSO), a traditional, but toxic cryoprotectant. Our findings show that Ha significantly improves biomaterial ink viscoelasticity, even after cryopreservation at ultra-low temperatures. Moreover, scaffolds incorporating Ha exhibited increased roughness and porosity and mechanical testing indicated that cryopreserved scaffolds with Ha were more durable. Interestingly, scaffolds without DMSO maintained high cell viability and metabolic activity, suggesting effective cryoprotection with reduced cytotoxicity. In conclusion, incorporating Ha into bioinks enhances scaffold properties and enables successful cryopreservation without DMSO, paving the way for safer and more efficient bioinks in tissue engineering and regenerative medicine.2025http://zaguan.unizar.es/record/15171610.1016/j.jddst.2025.106749http://zaguan.unizar.es/record/151716oai:zaguan.unizar.es:151716JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY 106 (2025), 106749 [10 pp.]All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/closedAccess