In vitro antimicrobial activity of a highly dispersed silica and polyhexamethylene guanidine hydrochloride (PHMG-HC) composite for local infections treatment


  • A. I. Doroshenko Bogomolets National Medical University, Ukraine
  • O. B. Balko Zabolotny Institute of Microbiology and Virology of the National Academy of Sciences of Ukraine, Ukraine
  • Ye. P. Voronin Chuiko Institute of Surface Chemistry of the National Academy of Sciences of Ukraine, Ukraine
  • A. M. Doroshenko Bogomolets National Medical University, Ukraine
  • G. V. Zaychenko Bogomolets National Medical University, Ukraine



Antibacterial, antibiotic resistance, antifungal, polyhexamethyleneguanidine hydrochloride, silica nanoparticles


The problem of antimicrobial drug resistance can be solved through the development of novel antimicrobial compounds and combination drugs. In order to enhance polyhexamethyleneguanidine hydrochloride (PHMG-HC) therapeutic benefits, a composite (code name CMU-211) of PHMG-HC with a nanoparticle-based sorbent of highly dispersed silica (HDS) was developed.

Aim. To evaluate in vitro antimicrobial activity of highly dispersed silica and PHMG-HC (HDS + PHMG-HC) composite (CMU-211), highly dispersed silica (HDS) suspension (CMU-212), and PHMG-HC solution as a reference against standard test-strains.

Materials and methods. HDS + PHMG-HC composite, HDS suspension, and PHMG-HC solution. Microbial test-strains (Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella enterica, Klebsiella pneumoniae, and Candida albicans). An antimicrobial activity of substances was studied with broth dilution method in LB liquid medium, minimum inhibitory concentrations (MIC) were obtained.

Results. CMU-211 has been shown to have high activity against C. albicans and S. aureus with a minimum inhibitory concentration (MIC) of 48.83/9.77 μg/mL (HDS/PHMG-HC) and marked effect on E. coli (MIC of 97.66/19.53 μg/mL) and S. enterica (MIC of 195.31/39.06 μg/mL). The relatively low activity of CMU-211 was reported against K. pneumoniae (MIC of 390.63/78.13 μg/mL) and P. aeruginosa (MIC of 195.31/39.06 μg/mL), however, the effect on P. aeruginosa was consistent with the activity of PHMG-HC applied alone. The concentrations of CMU-211 had to be twice as high as the MICs to ensure bactericidal (fungicidal) effect on microorganisms studied, except of S. enterica and K. pneumoniae for which bacteriostatic concentration was also proved to be bactericidal.

Conclusions. These results taken together with previous findings on CMU-211 high sorption activity suggest that the composite has double therapeutic activity and may be beneficial for local infections treatment.


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Pre-clinical studies of new drugs