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Shahbazi, M; Jager, H; Ettelaie, R.
(2022): Dual-Grafting of Microcrystalline Cellulose by Tea Polyphenols and Cationic epsilon-Polylysine to Tailor a Structured Antimicrobial Soy-Based Emulsion for 3D Printing
ACS APPL MATER INTER. 2022; 14(18): 21392-21405. FullText FullText_BOKU

Abstract:: : An imperative processing way to produce 3D printed structures with enhanced multifunctional properties is printing inks in the form of a gel-like colloidal emulsion. The surface-modified microcrystalline cellulose (MCC) is an excipient of outstanding merit as a particulate emulsifier to manufacture a stable Pickering emulsion gel. The tuning of the MCC structure by cationic antimicrobial compounds, such as epsilon-polylysine (epsilon-PL), can offer a surface activity with an antimicrobial effect. However, the MCC/epsilon-PL lacks the appropriate emulsifying ability due to the development of electrostatic complexes. To overcome this challenge, (i) a surface-active MCC conjugate was synthesized by a sustainable dual-grafting technique (ii) to produce a highly stable therapeutic soy-based Pickering emulsion gel (iii) for potential application in 3D printing. In this regard, the tea polyphenols were initially introduced into MCC by the free-radical grafting method to decrease the charge density of anionic MCC. Then, the antioxidative MCC-g-tea polyphenols were reacted by epsilon-PL to produce a dual-grafted therapeutic MCC conjugate (micro-biosurfactant), stabilizing the soybased emulsion system. The results indicated that the dual-grafted micro-biosurfactant formed a viscoelastic and thixotropic soy-based emulsion gel with reduced droplet size and long-term stability. Besides, there was an improvement in the interfacial adsorption features of soy-protein particles after micro-biosurfactant incorporation, where the interfacial pressure and surface dilatational viscoelastic moduli were enhanced. Consequently, it was revealed that the therapeutic Pickering emulsion gel was more suitable to manufacture a well-defined 3D architecture with high resolution and retained permanent deformation after unloading (i.e., a recoverable matrix). This work established that the modification of the MCC backbone by tea polyphenols and epsilon-PL advances its bioactive properties and emulsifying performance, which finally obtains a soy-based 3D printed structure with noteworthy mechanical strength.
Authors BOKU Wien:: Jäger Henry
Find related publications in this database (Keywords): Pickering emulsion; surface hydrophobicity; bioactivity properties; interfacial adsorption behavior; pseudoplasticity; thixotropic feature; mechanical property; 3D printing; toughening mechanism