Synthesis, characterization and biological activity of ternary molybdenum heteropoly salts

Abstract

Among the many inorganic bacterial inhibitors available today, polyoxometalates (POM), green antimicrobial agents with extremely high antimicrobial efficiency, have received attention. Attributed to the advantages of POM with various types, variable structures, good magnetic properties, electrical conductivity and redox activity, the modification of a POM was chosen in this work. Four new polyoxometalates with Keggin structures, K₇Mn(H₂O)NiMo₁₁O₃₉·8H₂O, K₇Mn(H₂O)ZnMo₁₁O₃₉·14H₂O, K₇Cu(H₂O)NiMo₁₁O₃₉·8H₂O and K₇Cu(H₂O)ZnMo₁₁O₃₉·14H₂O, were synthesized by the liquid-phase method using Mo as the coordination atom, Mn and Cu as the heteroatoms and Ni and Zn as the substitution atoms. The structures of the four polyoxometalates were characterized by elemental analysis (AAS), infrared (FT-IR) spectroscopy, ultraviolet-visible (UV-visible) spectroscopy, thermogravimetric analysis (TG), X-ray diffraction (XRD), and scanning electron microscopy (SEM). We also analyzed the inhibition performance on four bacteria, Escherichia coli, Bacillus subtilis, Staphylococcus aureus and Bacillus cereus. Herein, we examine the bacterial inhibitory effect and the inhibition rate of the POM against bacteria by four different methods of bacterial inhibition, filter paper sheet method, Oxford cup method, MIC value determination and TTC test.

KEYWORDS:

• Ternary heteropoly
• bacteriostatic property
• cup method
• TTC colorimetric test
• quantitative analysis

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Funding

We are grateful to the Heilongjiang Provincial Department of Education’s general project (YSTSXK201850) and the 2018 Heilongjiang Provincial Colleges and Universities Basic Scientific Research Business Expenses Research Project (Plant Food Processing Technology Special Subject Special) for funding.