| Title | Tunable enzymatic biodegradation of poly(butylene succinate): biobased coatings and self-degradable films |
|---|---|
| ID_Doc | 19985 |
| Authors | Peñas, MI; Criado-Gonzalez, M; de Ilarduya, AM; Flores, A; Raquez, JM; Mincheva, R; Müller, AJ; Hernández, R |
| Title | Tunable enzymatic biodegradation of poly(butylene succinate): biobased coatings and self-degradable films |
| Year | 2023 |
| Published | |
| Abstract | Biodegradation of polyesters driven by enzymes is considered as one of the most effective way of degradation of these materials, as a way to control plastics accumulation in the environment. In this study, we present two different strategies to tune the enzymatic degradation of PBS films triggered by a lipase from Pseudomonas cepacia. Firstly, the kinetics of enzymatic degradation of PBS films was regulated by applying multilayer coats of polysaccharide alginate and chitosan (Alg/Chi) films. Secondly, self-degradable PBS films were prepared by embedding lipase-filled alginate particles. For comparison purposes, a detailed enzymatic degradation study of neat PBS films exposed to a lipase from P. cepacia in solution was made to determine the main experimental parameters influencing their degradation in solution. The results showed that an increase in enzyme concen-tration increased the degradation extent and rate of neat PBS films. At a fixed enzyme concentration, stirring of the solution containing the enzyme and the PBS also increased the biodegradation rate. In the case of the PBS films coated with a different number of Alg/Chi layers by spray-assisted LbL and subjected to enzymatic degradation experiments in solution, the extent of degradation was found to be dependent on the number of protective coating layers. Therefore, the Alg/Chi biobased coating constitutes an effective barrier to the diffusion of the lipase, thus proving its effectiveness in modulating the enzymatic activity as a function of coating thickness. In the case of self-degradable PBS containing lipase-embedded alginate beads (employed to protect the enzyme during high-temperature processing), only limited biodegradation was observed as the amount of encapsulated enzyme employed was too small. Nonetheless, these results are promising, as the enzymatic activity -indicative of the degradation capacity of the enzyme- determined for all these samples was about 2 orders of magnitude lower than that of previous assays. |
| https://doi.org/10.1016/j.polymdegradstab.2023.110341 |
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