Rational Engineering of Hemicellulose-based Nanocarriers for Precision Biomedicine: A Critical Review of Molecular...

Hemicellulose, the second-most-abundant biopolymer on Earth, offers a renewable platform for nanomedicine due to its tunable branching chemistry, biocompatibility, and amphiphilic self-assembly. However, clinical translation of hemicellulose-based nanoparticles remains stalled due to the absence of quantitative design rules linking molecular architecture to biological performance. This critical review synthesizes 32 peer-reviewed studies (2010-2025) using a PRISMA-informed data extraction strategy to establish a quantitative structure-property-function framework for hemicellulose-based nanocarriers. Quantitative evaluation reveals that the arabinose-to-xylose ratio dictates nanoparticle morphology, and that degree of substitution (DS) controls self-assembly thermodynamics, following an exponential decay model: CAC = 0.112 × e^(-0.82×DS) (R² = 0.94). These relationships enable application-specific design: low branching produces small particles for intravenous targeting. In contrast, high branching favors wound healing. Four case studies illustrating therapeutic paradigms are presented: redox-responsive chemotherapy (5-fold decrease in IC₅₀), photodynamic therapy (10.8-fold decrease in IC₅₀), wound healing (100% closure at day 10), and stimuli-responsive sensing (5600% tensile strain). A translational scoring system (SNFT: Sustainability, Novelty, Feasibility, Translation) is introduced to benchmark clinical readiness. Critical barriers identified include manufacturing scalability, lack of ICH-compliant stability data, and undefined regulatory pathways. Future directions encompass AI-assisted optimization, green synthesis, and integration into implantable devices. By integrating an empirical DS-CAC model with evidence-informed structure-property relationships and a translational roadmap, this critical review provides a framework for the rational engineering of hemicellulose nanotherapeutics. STATEMENT OF SIGNIFICANCE: This review establishes a quantitative structure-property-function framework for the rational engineering of hemicellulose-based nanocarriers in precision biomedicine. Unlike previous descriptive reviews, this work integrates molecular architecture, self-assembly behavior, and biological performance into predictive design guidelines derived from 32 studies published between 2010 and 2025. Key relationships linking arabinose-to-xylose ratio, degree of substitution, and molecular weight to nanoparticle morphology, stability, drug loading, and therapeutic activity are critically analyzed. The review further introduces a translational benchmarking strategy (SNFT framework) to evaluate clinical readiness and manufacturing feasibility. By connecting renewable polysaccharide chemistry with nanomedicine, biomaterials engineering, and AI-assisted optimization, this work provides a roadmap for the development of sustainable and clinically translatable hemicellulose nanotherapeutics.