Diamond nanoparticles suppress lateral growth of bacterial colonies

The Influence of Diamond Nanoparticles on Fibroblast Cell Line L929, Cytotoxicity and Bacteriostaticity of Selected Pathogens

The main problem with using modified allotrophic forms of carbon with nanodiamond particles in the production of food packaging is establishing the boundary between safety, as it affects the human body, and the adequate and effective action of the substances. One vital area of concern is the transmission of pathogens in food into the body. The aim of this study was to evaluate the cytotoxicity and bacteriostatic biological activity of two different modifications of diamond nanoparticles: pure detonation nanodiamond particles (DND) obtained by Danienko and plasma-chemically modified detonation nanodiamond particles obtained by the microwave plasma activated chemical vapor deposition method in a rotary chamber (MDP1) An indirect method was used to evaluate the cytotoxicity effect in accordance with ISO 10993–5. The viability of the L929 fibroblast cell line used as a control was 98.5%, for DND 95.14%, and the lowest level of viability for MDP1 was 88.63%. Escherichia coli and Staphylococcus aureus bacteria were used in bacteriostatic tests and the degree of cytotoxicity of the tested materials was classified as low. The in vitro cytotoxicity results indicate no toxic effect on L929 cells nor any effect on any of the samples tested against the bacterial strains us

Effect of medium and aggregation on antibacterial activity of nanodiamonds

Fluorescent nanodiamonds are widely used as abrasives, optical or magnetic labels, in drug delivery or nanoscale sensing. They are considered very biocompatible in mammalian cells. However, in bacteria the situation looks different and results are highly controversial. This article presents a short review of the published literature and a systematic experimental study of different strains, nanoparticle sizes and surface chemistries. Most notably, particle aggregation behaviour and bacterial clumping are taken into consideration to explain reduced colony counts, which can be wrongly interpreted as a bactericidal effect. The experiments show no mechanism can be linked to a specific material property, but prove that aggregation and bacteriostatic effect of nanodiamond attachment play a significant role in the reported results.