Vasiliauskienė Dovilė, Boris Renata, Balčiūnas Giedrius, Kairytė Agnė, Urbonavičius Jaunius
Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania.
Laboratory of Composite Materials, Institute of Building Materials, Faculty of Civil Engineering, Vilnius Gediminas Technical University, LT-08217 Vilnius, Lithuania.
Microorganisms. 2022 Sep 14;10(9):1830. doi: 10.3390/microorganisms10091830.
Biocomposite boards (BcBs) composed of hemp shives and corn starch are known as thermal insulating or structural building materials. Therefore, they must be stable during exploitation. However, BcBs are exposed to microorganisms present in the environment, and it is of great interest to investigate the biodegradation behaviour of these materials. This work identified microorganisms growing on BcBs that contain either Flovan CGN or expandable graphite as flame retardants and selected fungi such as and to test the way they affect the materials of interest. For this purpose, the enzymatic activity of cellulases and amylases produced by these organisms were determined. In addition, the apparent density as well as compressive strength of the affected boards were evaluated. The results showed that apparent density and compressive strength deteriorated in BcB composition with the Flovan CGN flame retardant. At the same time, the level of deterioration was lower when the expandable graphite was used, suggesting that it also acts as an antimicrobial agent. A scanning electronic microscopy analysis was employed to monitor the growth of microorganisms in the BcBs. Such analysis demonstrated that, regardless of BcB composition, fungi easily penetrate into the middle layers of the material.
由大麻秸秆和玉米淀粉组成的生物复合板(BcBs)被认为是隔热或结构建筑材料。因此,它们在使用过程中必须保持稳定。然而,BcBs会接触到环境中存在的微生物,研究这些材料的生物降解行为具有重要意义。这项工作确定了在含有Flovan CGN或可膨胀石墨作为阻燃剂的BcBs上生长的微生物,并选择了如 和 等真菌来测试它们对相关材料的影响方式。为此,测定了这些生物体产生的纤维素酶和淀粉酶的酶活性。此外,还评估了受影响板材的表观密度和抗压强度。结果表明,含有Flovan CGN阻燃剂的BcB组合物的表观密度和抗压强度有所下降。同时,使用可膨胀石墨时的降解程度较低,这表明它还具有抗菌作用。采用扫描电子显微镜分析来监测BcBs中微生物的生长情况。这种分析表明,无论BcB的组成如何,真菌都很容易渗透到材料的中间层。