Effect of Electron-Beam Radiation and Other Sterilization Techniques on Structural, Mechanical and Microbiological Prope
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ORIGINAL PAPER
Effect of Electron‑Beam Radiation and Other Sterilization Techniques on Structural, Mechanical and Microbiological Properties of Thermoplastic Starch Blend Anna Iuliano1,2 · Agata Fabiszewska1 · Katarzyna Kozik1 · Magdalena Rzepna3 · Justyna Ostrowska4 · Maciej Dębowski2 · Andrzej Plichta2 Accepted: 11 November 2020 © The Author(s) 2020
Abstract This work investigates the potential application of various sterilization methods for microorganism inactivation on the thermoplastic starch blend surface. The influence of the e-beam and UV radiation, ethanol, isopropanol and microwave autoclave on structural and packaging properties were studied. All the applied methods were successful in the inactivation of yeast and molds, however only the e-beam radiation was able to remove the bacterial microflora. The FTIR analysis revealed no significant changes in the polymer structure, nevertheless, a deterioration of the mechanical properties of the blend was observed. The least invasive method was the UV radiation which did not affect the mechanical parameters and additionally improved the barrier properties of the tested material. Moreover, it was proved that during the e-beam radiation the chain scission and cross-linking occurred. The non-irradiated and irradiated samples were subjected to the enzymatic degradation studies performed in the presence of amylase. The results indicated that irradiation accelerated the decomposition of material, which was confirmed by the measurements of weight loss, and mass of glucose and starch released to the solution in the course of biodegradation, as well as the FTIR and thermal analysis. Keywords Electron-beam radiation · Starch · B. subtilis · Degradation · Mechanical properties
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10924-020-01972-9) contains supplementary material, which is available to authorized users. * Anna Iuliano [email protected] 1
Department of Chemistry, Institute of Food Sciences, Warsaw University of Life Sciences – SGGW, Nowoursynowska 159c, 02‑776 Warsaw, Poland
2
Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00‑664 Warsaw, Poland
3
Institute of Nuclear Chemistry and Technology, Dorodna 16, 03‑195 Warsaw, Poland
4
Department of Organic Technologies, The Łukasiewicz Research Network – New Chemical Syntheses Institute, al. Tysiąclecia Państwa Polskiego 13A, 24‑110 Puławy, Poland
Sterilization is a process, which allows for a complete destruction or removal of all microorganisms that could contaminate packaging materials and thereby constitute a health hazard [1]. The choice of a proper sterilization technique depends on the material used. There is no universal method for polymer sterilization. Every potential material has to go through a detailed analysis of its susceptibility to sterilization and all the packaging properties have to be investigated. Some of the polymers (both natural and synthetic) treated with superheated steam, hot
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