Developmental toxicity study with 3-(methylthio)propionaldehyde vapor by whole-body exposure of Sprague-Dawley rats

Time-mated Sprague-Dawley rats were exposed whole body to analytically measured 3-(methylthio) propionaldehyde (3-MTP) vapor concentrations of 0 (air controls), 9.87, 58.3 and 127.8 ppm over gestational days (gd) 6-15 for 6 h day(-1). There was an exposure concentration-related maternal toxicity (clinical signs, body weight change and food consumption) that was marginal at 9.87 ppm. No effects on gestational parameters, fetal numbers and sex ratio or fetal body weights were noted. There was no increase in the incidence of either malformations or variations (total, external, visceral or skeletal). Thus, the no-observed-adverse-effect level (NOAEL) for development toxicity for exposure to 3-MTP vapor was 127.8 ppm.