Enzymes are proteins that control the efficiency and effectiveness of biological reactions and systems, as well as of engineered biomimetic processes. This review highlights current applications of a diverse range of enzymes for biofuel production, plastics, and chemical waste management, as well as for detergent, textile, and food production and preservation industries respectively. Challenges regarding the transposition of enzymes from their natural purpose and environment into synthetic practice are discussed. For example, temperature and pH-induced enzyme fragilities, short shelf life, low-cost efficiency, poor user-controllability, and subsequently insufficient catalytic activity were shown to decrease pertinence and profitability in large-scale production considerations. Enzyme immobilization was shown to improve and expand upon enzyme usage within a profit and impact-oriented commercial world and through enzyme-material and interfaces integration. With particular focus on the growing biomedical market, examples of enzyme immobilization within or onto hyaluronic acid (HA)-based complexes are discussed as a definable way to improve upon and/or make possible the next generation of medical undertakings. As a polysaccharide formed in every living organism, HA has proven beneficial in biomedicine for its high biocompatibility and controllable biodegradability, viscoelasticity, and hydrophilicity. Complexes developed with this molecule have been utilized to selectively deliver drugs to a desired location and at a desired rate, improve the efficiency of tissue regeneration, and serve as a viable platform for biologically accepted sensors. In similar realms of enzyme immobilization, HA’s ease in crosslinking allows the molecule to user-controllably enhance the design of a given platform in terms of both chemical and physical characteristics to thus best support successful and sustained enzyme usage. Such examples do not only demonstrate the potential of enzyme-based applications but further, emphasize future market trends and accountability.
Hydrogels have been identified as biomaterials of significant interest owing to their unique propertieshydrophilic structures, high degree of structural flexibility, low toxicity, biocompatibilitythat qualify them as ideal candidates in a wide range of biomedical and pharmaceutical applications from wound dressing surface coatings, to drug delivery composites, and tissue scaffolds. However, such desired properties of hydrogels simultaneously endow these materials with inherent shortcomings that have hindered their prolific implementation in even more industrial applications; specifically, hydrogels suffer from low mechanical stability and loss of native function upon exposure to industrial solvents. One proposed technique to overcome these challenges and thus functionalize hydrogels to increased their wider range of industrial applications is their chemical modification to elicit controllable changes in their structure and function to thus fulfill the user-defined end goal. The chemical modification strategy further drives the need for an in-depth understanding of the physical and chemical phenomena that control the assembly of modified biopolymers and thus determine their functionality. We hypothesize that a combinatorial approach employing both molecular dynamics (MD) simulations and analytical techniques could be used to probe the self-assembly of alkyl chain-modified hyaluronic acid (HYA)model biopolymer chosen for its hydrophilicity, relative abundance, biocompatibility, and periodic carboxylate reactive groupand thus will allow us to control the assembly dynamics and its end structure properties when alkyl-chain-modified HYA networks are to be constructed, especially porosity, average pore aperture size, and accessible surface area. For this purpose, modified HYA chains were synthesized via (1)-ethyl-3-(3-dimethylaminopropyl) carbodiimide chloride (EDC)-mediated amine group attachment of dodecylamine to the periodic carboxylate group onto the HYA backbone. Material characterization including Fourier transform infrared spectroscopy, nuclear magnetic resonance, and thermogravimetric analysis was conducted to confirm the expected EDC reaction chemistry and further assess the water uptake capacity of the resulting modified hydrogels. MD simulations of both unmodified HYA and modified HYA chainswith varied lengths of attached alkyl groups as well as varied degrees of alkyl group substitution on the HYA backbonewere carried out to analyze the self-assembly dynamics of such chains and thus determine how differences in chemical modification eventuate the critical differences in the end structure properties of the resulting networks. Our findings demonstrate that targeted, atomic-level investigation and corroborated analytical analyses of the assembly of chemically modified hydrogels are necessary to develop the next generation of fully optimized biomaterials that have extended applicability in industrial settings.
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