Fuente: Polymers Polymers, Vol. 18, Pages 976: A Composite Based on L-Polylactide with Cu or CuO Nanoparticles: Physical Properties and Biological Activity
Polymers doi: 10.3390/polym18080976
Authors:
Dmitriy A. Serov
Fatikh M. Yanbaev
Dmitriy E. Burmistrov
Ilya V. Baimler
Sergei O. Liubimovskii
Liudmila Y. Kozlova
Ivan A. Popov
Ann V. Gritsaeva
Polina A. Fomina
Lev R. Sizov
Valery A. Kozlov
Evgeny V. Kuzmin
Alexander V. Simakin
Maxim E. Astashev
Sergey V. Gudkov

The development of biodegradable, biocompatible materials with inherent antibacterial properties, suitable for 3D printing, is a key challenge in modern materials science. Composites based on PLA and copper nanoparticles (NPs) are promising candidates for such a material. A protocol of the low-temperature incorporation of 0.1% Cu NPs or 0.1% CuO NPs into a PLA was developed. The dependence of the materials’ physicochemical properties on nanoparticle composition was evaluated. Cu and CuO NPs were synthesized via liquid-phase laser ablation and had sizes of 25 and 80 nm, with modal zeta potential values of +31 and +42 mV, respectively. The incorporation of Cu NPs enhances the tensile strength and Young’s modulus of PLA, and improves antibacterial properties. The PLA + 0.1% CuO or PLA + 0.1% Cu nanoparticles inhibited the growth of E. coli by ~60% and >80%, respectively. PLA + 0.1% Cu NPs destructed of bacterial cell walls. The antibacterial action mechanisms are an 8-oxoguanine and LRPS generations. The obtained materials did not exhibit cytotoxic effects against normal human fibroblasts, did not alter the pH or redox potential of water, and did not release of Cu2+ in concentrations toxic to humans. The material PLA + 0.1% Cu NPs is the most optimal. This material may find applications in food production and biomedical applications.