title: Acute toxicity, primary irritancy, and genetic toxicity studies with 3-(methylthio)propionaldehyde.
abstract: Basic acute toxicity, primary irritancy, and genetic toxicity studies were conducted with 3-(methylthio)propionaldehyde (3-MTP). The acute rat peroral LD50 (with 95% confidence limits) for 3-MTP as a 25% (v/v) dilution in corn oil was 1.00 (0.59-1.70) ml/kg (males) and 1.68 (0.95-2.99) ml/kg (females); most deaths occurred 1.5 to 4 h postdosing. By 24-h occluded contact with undiluted 3-MTP, the rabbit acute percutaneous LD50 was 0.71 (0.43-1.15) ml/kg (males) and 0.79 (0.49-1.30) ml/kg (females): times to death ranged from 2 h to 2 d after the start of dosing. Exposure of rats to a statically generated saturated atmosphere killed all 5 males with a 40 min exposure and all 5 females with a 24 min exposure. In contrast, a 4-h exposure of rats to a dynamically generated saturated vapor atmosphere of 3-MTP did not produce any mortalities or signs of toxicity. A 4-hr occluded contact with 0.5 ml undiluted 3-MTP caused moderate to severe erythema and severe edema resolving by 7 to 17 d. Five/6 animals had necrosis apparent on removal of the occlusive dressing and persisting 10 to 17 d. On the rabbit eye, 0.1 ml undiluted 3-MTP produced moderate to severe corneal injury with iritis and moderate conjunctival inflammation which persisted 21 d in 3/6 animals; 0.01 ml caused moderate diffuse corneal injury and moderate conjunctival inflammation with healing by 7 d. 3-MTP did not produce mutagenic activity either in the absence or presence of metabolic activation with a Salmonella typhimurium reverse mutation assay using strains TA98, TA100, TA1535, TA1537 and TA1538. In a mouse lymphoma cell (L5178Y/tk +/-) assay, 3-MTP produced concentration-related increases in mutant colonies, both in the absence and presence of metabolic activation. Increases were mainly in the sigma (chromosomal damaging) colonies. In a mouse bone marrow micronucleus study, with vapor exposures to 37.4, 88.5 and 155.6 ppm for 1 h/d for 2 consecutive d, there were exposure concentration-related increases in micronucleated erythrocytes which were statically significant for male mice.
authors.affiliation: Applied Toxicology Group, Union Carbide Corporation, Danbury, CT 06817-0001, USA.
authors.forename: B
authors.initials: B
authors.lastname: Ballantyne
authors.forename: R C
authors.initials: RC
authors.lastname: Myers
mesh_terms: D000279:Administration, Cutaneous; D000280:Administration, Inhalation; D000284:Administration, Oral; D000447:Aldehydes / Q000633:toxicity*; D000818:Animals; D001853:Bone Marrow / Q000187:drug effects; D003315:Cornea / Q000187:drug effects; D065306:Corneal Injuries; D005131:Eye Injuries / Q000139:chemically induced; D005260:Female; D007509:Irritants / Q000633:toxicity*; D007940:Leukemia L5178 / Q000201:enzymology / Q000235:genetics; D008297:Male; D051379:Mice; D015162:Micronucleus Tests; D009153:Mutagens / Q000633:toxicity*; D017354:Point Mutation / Q000187:drug effects; D011817:Rabbits; D051381:Rats; D017207:Rats, Sprague-Dawley; D012486:Salmonella typhimurium / Q000187:drug effects / Q000235:genetics; D012867:Skin / Q000187:drug effects; D013937:Thymidine Kinase / Q000235:genetics
chemical_list: D000447:Aldehydes; D007509:Irritants; D009153:Mutagens; C008390:methional; D013937:Thymidine Kinase