**4. Conclusions**

Biopolymers are currently in the spotlight in terms of their production and use, which is continuously increasing. This work evidences that it is possible to produce electrospun fibers from purified WTPS by using water and EDTA. Firstly, the viscosity was determined at 20,000 mPas, which led to satisfying nanofiber morphology, without visible defects, beads or drops within the fiber structure. Due to the presence of impurities in the WTPS, the glass transition temperature of the material was found to be at a higher temperature than usual for PHA, along with two low intensity peaks below the melting temperature. The melting point at 150 ◦C is within the range of temperatures characteristic for PHA polymers. The low amount of PHA was also confirmed in both samples. Due to the process of purification, the amount of PHA was lower in purified WTPS. However, all the analyzed properties showed that the final material was brittle and less stretchable compared to the packaging films on the market. Further research should be conducted on the possible addition of other biopolymers produced from alternatively sourced or recycled materials to purified WTPS to obtain a material with desired mechanical properties.

**Author Contributions:** Conceptualization, G.L. and U.V.-B.; methodology, G.L. and U.V.-B.; validation, G.L., A.M., B.P., S.N. and U.V.-B.; formal analysis, G.L., A.M. and U.V.-B.; investigation, G.L., A.M., D.M. and S.N.; writing—original draft preparation, G.L., A.M., B.P., S.N., D.M. and U.V.-B.; writing—review and editing, G.L., A.M., D.M. and U.V.-B. All authors have read and agreed to the published version of the manuscript.

**Funding:** The first author C.L. MSc extends his gratitude to COST action FP1405—Active and Intelligent Fiber-Based Packaging for providing the gran<sup>t</sup> to support the Short Term Scientific Mission (STSM) research activities at the University of Novi Sad, Faculty of Technology, Novi Sad, Serbia.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
