title: An evaluation of acute toxicity of colloidal silver nanoparticles.
abstract: Tests for acute oral toxicity, eye irritation, corrosion and dermal toxicity of colloidal silver nanoparticles (AgNPs) were conducted in laboratory animals following OECD guidelines. Oral administration of AgNPs at a limited dose of 5,000 mg/kg produced neither mortality nor acute toxic signs throughout the observation period. Percentage of body weight gain of the mice showed no significant difference between control and treatment groups. In the hematological analysis, there was no significant difference between mice treated with AgNPs and controls. Blood chemistry analysis also showed no differences in any of the parameter examined. There was neither any gross lesion nor histopathological change observed in various organs. The results indicated that the LD(50) of colloidal AgNPs is greater than 5,000 mg/kg body weight. In acute eye irritation and corrosion study, no mortality and toxic signs were observed when various doses of colloidal AgNPs were instilled in guinea pig eyes during 72 hr observation period. However, the instillation of AgNPs at 5,000 ppm produced transient eye irritation during early 24 hr observation time. No any gross abnormality was noted in the skins of the guinea pigs exposed to various doses of colloidal AgNPs. In addition, no significant AgNPs exposure relating to dermal tissue changes was observed microscopically. In summary, these findings of all toxicity tests in this study suggest that colloidal AgNPs could be relatively safe when administered to oral, eye and skin of the animal models for short periods of time.
authors.affiliation: Sensor Research Unit, Department of Chemistry, Faculty of Science and 2)Department of Veterinary Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand.
authors.forename: Pattwat
authors.initials: P
authors.lastname: Maneewattanapinyo
authors.forename: Wijit
authors.initials: W
authors.lastname: Banlunara
authors.forename: Chuchaat
authors.initials: C
authors.lastname: Thammacharoen
authors.forename: Sanong
authors.initials: S
authors.lastname: Ekgasit
authors.forename: Theerayuth
authors.initials: T
authors.lastname: Kaewamatawong
mesh_terms: D000818:Animals; D001835:Body Weight / Q000187:drug effects; D003102:Colloids; D005123:Eye / Q000187:drug effects; D005260:Female; D006168:Guinea Pigs; D007928:Lethal Dose 50; D008297:Male; D053768:Metal Nanoparticles / Q000633:toxicity*; D051379:Mice; D008813:Mice, Inbred ICR; D011897:Random Allocation; D012834:Silver / Q000633:toxicity*; D012867:Skin / Q000187:drug effects; D023422:Skin Irritancy Tests; D023382:Toxicity Tests, Acute
chemical_list: D003102:Colloids; D012834:Silver