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EC number: 202-981-2 | CAS number: 101-84-8
Preliminary experiments ruled out any evident action of the intermediate solvents (DMSO, DEE, E) on embryogenesis even at concentrations above 1 0/00, ie, the level commonly adopted in the experiments. DPE was effective in inducing developmental abnormalities in S granularis, following the different treatment schedules (minimal active levels:e-6 M for DPE). P Zividus embryos and gametes appeared to be somewhat more resistant than S granularis (minimal active levels:e-5 M for DPE). In both species, however, the exposure of embryos mainly resulted in pathologic, mesenchyme-filled blastulae, exogastrulae, up to prehatching blockage. Along with the induction of developmental defects, mitotic activity in DPE-exposed embryos was affected quantitatively and morphologically in both species. The changes in mitotic patterns from a control P Zividus cleaving embryo (~ 125-c) to heavily affected DPE-exposed (9 e-5 M) embryos, displaying an impairment of cleavage and abnormal, highly hyperchromic mitotic figures. The quantitative alterations of mitotic activity in P lividus, following exposure to DPE were reported, showing a dose-response decrease in the number of mitoses per embryo (MPE), consistently associated with an increase in interphase embryos (IE). Mitotic abnormalities, though evident, did not display a consistent dose-response trend, possibly owing to the mitotic blockage at the highest DPE level. The exposure of sperm, in both species, resulted in a depression of the fertilizing capacity and in an increase of developmental and mitotic abnormalities. These effects also displayed a greater effectiveness of DPE, as compared to DP. Data showed the inactivation patterns of S granularis sperm, following exposure to DPE. A figure showed the induction of larval malformations following exposure of P lividus sperm, resulting in embryonic lethality, at the highest DPE (9 x e-5 M) levels. An example of developmental abnormality, where skeletal malformation is dramatically affecting pluteus arms was presented. A decrease in MPE and a concomitant increase in IE (both reflecting a loss in mitotic activity) were observed, similarly to the results of embryo exposure. The increase in mitotic abnormalities, with the appearance of free chromosomes and asymmetrical mitotic figures, was evident at the highest DPE level (~ e-4 M).
I.) Induction of Developmental Defects Following Exposure of S granulari's Embryos or Gametes to DPE. P lividus Displayed Widely Overlapping Results:
Treatment:Control Cleavage (125-c)(5 h after fertilization); Gastrulae(24 h after fertilization); Plutei (48 h after fertilization)
Treatment: e-5 M DPE
Embryos: Abnormal/blocked cleavage (5 h after fertilization) Filled blastulae; Cell Separation (24 h after fertilization) Indifferentiated blastulae; exogastrulae (48 h after fertilization)
Sperm: --- (5 h after fertilization); Indifferentiated or filled blastulae(24 h after fertilization); Loss of motility; cytolysis (48 h after fertilization)
Eggs: Early cytolysis; abnormal cleavage(5 h after fertilization); Cytolysis; pathologic survivors (24 h after fertilization); Cytolysis (48 h after fertilization)
II.) Sperm Inactivation Experiment: Decrease in Fertilization Rate (FR) Induced by Prolonged Exposure of S granularis Sperm to DPE (Mean of Two Experiments:
FR +/- SE)
Control (1 0/00 DMSO): 95 +/- 0.5, 85 +/- 4, 56 +/- 6, 9 +/- 3 and 1+/- 0.5 following sperm exposure for 2, 5, 10, 30 and 40 min,. respectively.
e-5M DPE: 86 +/- 3, 59 +/- 1, 9 +/- 2, 1 +/- 0.5 and 0.5 +/- 0.5 following sperm exposure for 2, 5, 10, 30 and 40 min,. respectively.
This study was designed to investigate the possible genotoxic and teratogenic actions of diphenyl (DP), diphenyl ether (DPE), and their eutectic mixture, in a comparative approach including different test systems. Two microbial systems and a metazoan model were used: (1) diploid D7 strain of Saccharomyces cerevisiae; (2) Salmonella typhimurium strains TA100, TA98, TA1535, TA1537, TA1538, TA1532, TA2636; and (3) sea urchins (Paracentrotus lividus and Sphearechinus granularis).
Both compounds resulted in severe toxicity in all of test organisms at levels >/= e-5 M ( ~ 2 ppm). DP caused genetic effects in yeast with and without activating system, while the two chemicals appeared to be ineffective in Salmonella up to toxic levels. The action of DP and DPE on sea urchins resulted in developmental defects and mitotic abnormalities, following exposure of embryos or by pretreatment of sperm or eggs. In this system DPE appeared to be more effective than DP by about one order of magnitude (minimal active concentrations: e-5 M vs e-4 M).
The eutectic mixture, industrially used as a heat transfer medium, was tested in its virgin and used form, for genotoxicity and embryotoxicity. The latter appeared to be more effective than the virgin eutectic. This increase in the embryoand genotoxicity of the used eutectic may be related to the appearance of newly formed compounds in the heat transfer process. These compounds have been separated by high-pressure liquid chromatography and detected by fluorimetry.
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