Silica–phenolic hybrid nanocarriers in redox oncology: interfacial mechanisms and translational barriers

Abstract

Plant-derived phenolic compounds are attractive redox-active agents in oncology because they can reshape oxidative stress and redox signaling; however, clinical translation remains limited by low solubility, instability, rapid metabolism, and insufficient tumor exposure. Mesoporous silica nanoparticles (MSNs) offer a modular scaffold that can stabilize phenolics, tune spatiotemporal release, and program interfacial redox kinetics. In this mini-review, we argue that silica-phenolic systems are better understood as programmable redox interfaces whose outputs depend on dose, compartment, and microenvironment. We define tumor redox sensitization as tumor-directed amplification of oxidative pressure and antioxidant shielding as restricted protection of non-malignant tissues from therapy-associated oxidative injury. We discuss adsorption, covalent display, and stimuli-responsive gating, together with liabilities such as polyphenol pro-oxidant switching, protein corona-driven identity shifts, heterogeneous tumor exposure, safety and biodegradation constraints, and the absence of standardized redox readouts. We also place MSN-phenolic designs in the context of human evidence from adjacent silica nanomedicines and nanoformulated polyphenols, underscoring that oncology-specific MSN-phenolic systems remain preclinical. We propose practical design and reporting rules to improve reproducibility and clinical readiness.