This study provides new information directed to solving the objective of highlighting and assessing the degree of hazard of nanoparticles to the environment. The proposed procedure is to apply as a model in the practice of monitoring the toxicity of metal oxide nanoparticles of pigmented yeasts. The proposed procedure is to apply, as a model, the nanoparticles of pigmented yeast Rhodosporidium toruloides (synonymous Rhodotorula gracilis) CNMN-Y-30 in the practice of monitoring the toxicity of metal oxide. Based on the response of the yeast, the level of toxicity of nanoparticles is determined based on the concentrations decrease by 50 % of the content of β-carotene in the biomass of yeasts and catalase antioxidant enzyme activity. This information can be used by professionals in the food industry, microbiology, medicine, cosmetology, textiles, etc., where those nanomaterials have applications.
