Hazzard assessment and cytogenotoxic effects of different concentrations of mercury chloride sterilant using an onion (Allium cepa) assay

Abstract

Abstract The Allium cepa assay represents a crucial in vivo model for evaluating the cytotoxicity and genotoxicity of substances. This study investigated the cytogenotoxicity potential of mercury chloride (HgCl 2 ), a laboratory disinfectant and catalyst, using an Allium cepa assay. Mitotic slides were prepared from onion root tip cells grown on media supplemented with different concentrations of HgCl 2 (0%, 0.2%, 0.4%, 0.6%, 0.8%, and 1.0%). The slides were observed to evaluate cytogenotoxicity based on measurements of the mitotic index, mitotic inhibition percentage, clastogenic alterations, and root length over 10 days. The results suggest that the concentrations used may harm the cell, leading to adverse impacts on the mitotic index, mitotic inhibition, root growth and chromosome structure. Different chromosomal aberrations, such as bridge formation, fragmentation, wandering chromosomes, stickiness, binucleus formation and micronucleus formation, were detected depending on the concentration. Although lower concentrations (0.2–0.4%) had fewer effects on the cells, they still had a significant cytogenotoxic effect ( p < 0.05 ) compared to that of the control (0.0%). The higher the concentration was, the greater the effects on clastogenic changes. The observed abnormalities in both mitotic spread and root growth indicate that mercury chloride is cytotoxic even at low concentrations and can cause mitotic-depressive effects at higher concentrations. The results of this investigation can be used as a guide to guarantee sufficient safety precautions for people and organs during the regular use of HgCl 2 .