Influence of vermiculite particles on antioxidant properties of cultural medium of Bacillus subtilis IMV V-7023

Microbial Interaction with Clay Minerals and Its Environmental and Biotechnological Implications

“…Because clay minerals influence important components of the antioxidant system of bacteria, including enzymes and low-molecular compounds, they determine the microbial antioxidant potential as a whole. In conclusion, our results demonstrated that such clay minerals as montmorillonite, palygorskite and vermiculite at certain concentrations may have significant effects on the different parameters of antioxidant potential of plant growth-promoting Rhizobacteria which might also have an impact on the associated plants [251,256,259,260,266,267]. However, the insights of the clay minerals impact on the complex pro-and antioxidant processes occurring in the microbial cells are still insufficient and require further detailed interdisciplinary research.…”

“…At the cultivation of this strain with 0.05 g/L montmorillonite-containing bentonite, the concentration of gallic acid in the methanol extract of the bacterial culture medium increased by 12.9%, that of trans-cinnamic acid by 54.4% and that of 4-hydroxyphenylacetic acid (4-HPA) did not change considerably compared to clay-free control. In the case of bentonite concentration increased up to 0.5 g/L, the amount of gallic acid increased by 31.9%, that of 4-HPA by 54.8%, and that of trans-cinnamic acid decreased by 35.1% [266,267]. Therefore, the bentonite effect on the synthesis of phenolic acids by bacteria is directly related to mineral concentration in the nutrient medium and to the chemical structure of the studied bacterial metabolites [268].…”