Department of Genetics, Faculty of Biology and Veterinary Science, Nicolaus Copernicus University in Toruń, Lwowska 1, 87-100 Toruń, Poland.
Department of Environmental Microbiology, Faculty of Biology and Veterinary Science, Nicolaus Copernicus University in Toruń, Lwowska 1, 87-100 Toruń, Poland.
Int J Mol Sci. 2021 Sep 23;22(19):10228. doi: 10.3390/ijms221910228.
The microbial biodegradation of new PLA and PCL materials containing birch tar (1-10% /) was investigated. Product of dry distillation of birch bark ( Roth) was added to polymeric materials to obtain films with antimicrobial properties. The subject of the study was the course of enzymatic degradation of a biodegradable polymer with antibacterial properties. The results show that the type of the material, tar concentration, and the environment influenced the hydrolytic activity of potential biofilm degraders. In the presence of PCL films, the enzyme activities were higher (except for α-D-glucosidase) compared to PLA films. The highest concentration of birch tar (10% /) decreased the activity of hydrolases produced by microorganisms to the most significant extent; however, SEM analysis showed the presence of a biofilm even on plastics with the highest tar content. Based on the results of the biological oxygen demand (BOD), the new materials can be classified as biodegradable but, the biodegradation process was less efficient when compared to plastics without the addition of birch tar.
研究了含有桦木焦油（1-10% /）的新型 PLA 和 PCL 材料的微生物生物降解。将桦树皮（Roth）的干馏产物添加到聚合物材料中，以获得具有抗菌性能的薄膜。本研究的主题是具有抗菌性能的可生物降解聚合物的酶降解过程。结果表明，材料类型、焦油浓度和环境影响潜在生物膜降解剂的水解活性。与 PLA 薄膜相比，在存在 PCL 薄膜的情况下，酶活性更高（除α-D-葡萄糖苷酶外）。桦木焦油的最高浓度（10% /）最大程度地降低了微生物产生的水解酶的活性；然而，SEM 分析表明，即使在含有最高焦油含量的塑料上也存在生物膜。根据生物需氧量（BOD）的结果，新材料可被归类为可生物降解的，但与未添加桦木焦油的塑料相比，其生物降解过程效率较低。
