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Summary: This protocol describes the preparation of a nanoparticle-encapsulated bioink capable of protecting tissue-engineered constructs against bacterial infections while also providing contrast for magnetic resonance (MR) imaging modalities. The report includes details of preparing the methacrylated gelatin-based bioinks and the incorporation of superparamagnetic iron oxide nanoparticles. A detailed protocol is presented for characterizing the bioink, evaluating cell response, and assessing its antibacterial effect. Overall, this article presents a robust approach for the development of antibacterial, MR-visible bioinks suitable for various tissue engineering applications.For complete details on the use and execution of this protocol, please refer to Theus et al.1 : Publisher’s note: Undertaking any experimental protocol requires adherence to local institutional guidelines for laboratory safety and ethics.