Toxicity assessment of emamectin benzoate and its commercially available formulations in Pakistan by in vivo and in vitro assays

• Published in: Food and chemical toxicology 2022-07, Vol.165, p.113139-113139, Article 113139
• Main Authors: Mobeen, Ameena, Khan, Qaiser M., Ishrat, Iqra, Awan, Fazli Rabbi, Mansoor, Shahid
• Format: Article
• Language: English
• Subjects: Acute toxicity; Biopesticide; Emamectin benzoate; Genotoxicity; Tycon 5
• ISSN: 0278-6915; 1873-6351
• DOI: 10.1016/j.fct.2022.113139

Emamectin benzoate (EMB) is generally considered a safe insecticide in agriculture and veterinary practices, yet, it can cause cytotoxic and genotoxic effects. Hence, the aim of this study was to evaluate toxic effects of 80% EMB and its commercially used formulations (Tycon 1.9% EC and Tycon plus 5% EW) in Pakistan and tested for acute toxicity in albino rats, rabbits and fish (Labeo rohita). Genotoxicity was investigated by in vivo comet assay and bone marrow micronucleues test in the rats. In vitro mutagenicity was tested in Salmonella typhimurium TA98 and TA100. The tested EMB formulations were found moderately toxic (oral LD50: 122–168 mg/kg), causing severe eye irritation in rabbits, highly toxic to fish (LC50: 9–43 μg/L) and found non mutagenic. Oral administrations of EMB (80% and 5%) at 100 mg/kg of body weight to male rats reduced red blood cells, hemoglobin, and slightly increased the blood glucose, urea and liver enzymes levels but had no significant damage to DNA. EMB induced bone marrow toxicity was observed as reduction of polychromatic erythrocytes. Overall, EMB exposure was highly toxic to fish, and caused hemo- and hepatotoxicity in rats. These findings warrant cautious use of EMB formulations in agrochemicals and veterinary medicine. [Display omitted] •Toxicity evaluation of 80% emamectin benzoate (EMB) , its formulations Tycon 1.9% EC and Tycon plus 5% EW.•EMB formulations characterize as severe eye irritant to rabbit, highly toxic to fish.•Acute exposure of EMB and Tycon 5% cause hemo-hepatotoxicity and reduction of polychromatic erythrocytes (PCEs) in Wistar rats.•These findings warrant cautious use of EMB formulations in agrochemicals and veterinary medicine.