2-Hydroxyethyl methacrylate

メタクリル酸 2-ヒドロキシエチルエステル


[CAS No. 868-77-9]

Molecular formula: C6H10O3 Molecular weight: 130.16

ABSTRACT

2-Hydroxyethyl methacrylate was studied for oral toxicity in rats in an OECD combined repeat dose and reproductive/developmental toxicity screening test at doses of 0, 30, 100, 300 and 1000 mg/kg/day. One male and 6 females of the 1000 mg/kg group (12 animals of each sex) died during the treatment period.

In the males, BUN was elevated or tended to be high at 30 mg/kg or more, and the relative kidney weights were increased at 100 mg/kg or more. Salivation, suppression of body weight gain, decrease in food consumption, increased K, Cl and inorganic phosphorus, decreased triglyceride, increased relative liver weights, dilatation of renal tubules and collection tubules in the kidney were seen at 1000 mg/kg. In the females, the relative kidney weights were elevated or tended to be high at 100 mg/kg or more. Salivation, decrease in locomotor activity, adoption of a prone position, lacrimation, soiled fur, hypothermia, bradypnea, suppression in body weight gain, decrease in food consumption, increases of the absolute and relative kidney weights, neutrophil cellular infiltration in the papilla and medulla and massive malacia in the medulla oblongata were seen at 1000 mg/kg. The NOELs for repeat dose toxicity are considered to be less than 30 mg/kg for males, and 30 mg/kg for females.

With regard to reproductive/developmental toxicity, no effects of the test substance on copulation, fertility, delivery or lactation were noted.

The NOELs for reproductive performance of males and females, and for pup development are considered to be 1000 mg/kg/day both.

2-Hydroxyethyl methacrylate was not mutagenic in Salmonella typhimurium TA100, TA1535, TA98, TA1537 and Escherichia coli WP2 uvrA, with or without an exogeneous metabolic activation system.

Genotoxicity of 2-hydroxyethyl methacrylate was studied by the chromosomal aberration test in cultured Chinese hamster lung (CHL/IU) cells. Structural chromosomal aberrations were induced at 0.65 and 1.3 mg/ml (mid and high concentrations) with 24 h continuous treatment, at 0.16 - 0.65 mg/ml (all concentrations) with 48 h continuous treatment and at 1.3 mg/ml (high concentration) with short-term treatment and an exogenous metabolic activation system. Polyploidy was induced at 0.65 mg/ml with 48 h continuous treatment and at 0.33 and 1.3 mg/ml (low and high concentrations) with short-term treatment without the metabolic activation system.

SUMMARIZED DATA FROM THE STUDIES

1. Repeat Dose and Reproductive/Developmental Toxicity1)

Purity:97.6%
Test species/strain:Rat/Crj:CD (SD)
Test method:OECD Combined Repeat Dose and Reproductive/Developmental Toxicity Screening Test
 Route:Oral (gavage)
 Dosage:0 (vehicle), 30, 100, 300, 1000 mg/kg/day
 Number of animals/goup:Males, 12; females, 12
 Vehicle:Water for injection
 Administration period:Males, 49 days
Females, from 14 days before mating to day 3 of lactation
 Terminal kill:Males, day 50
Females, day 4 of lactation
GLP:Yes

 Test results:

<Repeat Dose Toxicity>

For the males, BUN was elevated or tended to be high in the 30 mg/kg or more groups, the relative kidney weights were increased in the 100 mg/kg or more groups. Salivation, suppression of body weight gain, decreased food consumption, increased K, Cl and inorganic phosphorus, decreased triglyceride, increased relative liver weights, and dilatation of renal tubules and collection tubules in the kidney were found in the 1000 mg/kg group, 1 animal of which died.

For the females, the relative kidney weights were elevated or tended to be high in the 100 mg/kg or more groups. Salivation, decrease in locomotor activity, adoption of a prone position, lacrimation, soiled fur, hypothermia, bradypnea, suppression of body weight gain, decreased food consumption, increased absolute and relative kidney weights, neutrophil cellular infiltration in the papilla and medulla and massive malacia in the medulla oblongata were found in the 1000 mg/kg group, 6 animals of which died.

The NOELs for repeat dose toxicity are considered to be less than 30 mg/kg for males, and 30 mg/kg for females.

<Reproductive/Developmental Toxicity>

There were no effects of the test substance on the estrus frequency, copulation index, number of conceiving days, fertility index, length of gestation, number of corpora lutea or gestation index.

There were no effects of the test substance on the number of live pups born, birth index, number of dead pups, number of pups born, delivery index, live birth index, sex ratio, viability index, external anomalies, body weight or necropsy findings.

The NOELs for the reproductive/developmental toxicity are considered to be 1000 mg/kg/day for reproduction in both sexes as well as for development of pups.

2. Genetic Toxicity

2-1. Bacterial test2)

Purity:97.6 wt%
Test species/strains:Salmonella typhimurium, TA100, TA1535, TA98, TA1537, Escherichia coli WP2 uvrA
Test method:Guidelines for Screening Mutagenicity Testing of Chemicals (Japan) and OECD Guideline No. 471 and 472
 Procedures:Pre-incubation method
 Solvent:Water
 Positive controls:-S9 mix, 2-(2-Furyl)-3-(5-nitro-2-furyl) acrylamide (TA100, TA98, WP2), Sodium azide (TA1535) and 9-Aminoacridine (TA1537)
+S9 mix, 2-Aminoanthracene (five strains)
 Doses:-S9 mix; 0, 313, 625, 1250, 2500, 5000μg/plate (five strains)
+S9 mix; 0, 313 - 5000 μg/plate (five strains)
 S9:Rat liver, induced with phenobarbital and 5,6-benzoflavone
 Plates/test:3
 Number of replicates:2
GLP:Yes

 Test results:

This chemical did not induce mutations in the S. typhimurium and E. coli strains. Toxicity was not observed at 5000 μg/plate in five strains with or without an S9 mix.

Genetic effects:
Salmonella typhimurium TA100, TA1535, TA98, TA1537
+?-
Without metabolic activation:[ ][ ][*]
With metabolic activation:[ ][ ][*]

Escherichia coli WP2 uvrA
+?-
Without metabolic activation:[ ][ ][*]
With metabolic activation:[ ][ ][*]

2-2. Non-bacterial in vitro test (chromosomal aberration test)2)

Purity:97.6%
Type of cell used:Chinese hamster lung (CHL/IU) cells
Test method:Guidelines for Screening Mutagenicity Testing of Chemicals (Japan) and OECD Guideline No. 473
 Solvent:Distilled water
 Positive controls:-S9 mix, Mitomycin C
+S9 mix, Cyclophosphamide
 Doses:-S9 mix (continuous treatment):0, 0.16, 0.33, 0.65, 1.3 mg/ml
-S9 mix (short-term treatment):0, 0.33, 0.65, 1.3 mg/ml
+S9 mix (short-term treatment):0, 0.33, 0.65, 1.3 mg/ml
 S-9:Rat liver, induced with phenobarbital and 5,6-benzoflavone
 Plates/test:2
GLP:Yes

 Test results:

Cytogenetic effects were seen as follows.
Structural chromosomal aberrations (including gap) were induced under the following conditions: 24 h continuous treatment (0.65 and 1.3 mg/ml: mid and high concentrations, 10.0 and 70.6%, respectively); 48 h continuous treatment (0.16 - 0.65 mg/ml: all concentrations, 6.0 - 84.0%); short-term treatment with an exogenous metabolic activation system (1.3 mg/ml: high concentration, 13.0%). Polyploidy was induced under the following conditions: the 48 h continuous treatment (0.65 mg/ml, 3.25%); short-term treatment with an exogenous metabolic activation system (0.65 mg/ml: mid concentration, 1.25%); short-term treatment without the metabolic activation system (0.33 and 1.3 mg/ml: low and high concentrations, 0.88 and 6.13%, respectively). However, a trend test showed no dose-dependency for the polyploidy with short-term treatment and the metabolic activation system.

Lowest concentration producing cytogenetic effects in vitro:
Without metabolic activation (continuous treatment):0.16 mg/ml (clastogenicity)
:0.65 mg/ml (polyploidy)
Without metabolic activation (short-term treatment):0.33 mg/ml (polyploidy)
With metabolic activation (short-term treatment):1.3 mg/ml (clastogenicity)
:0.65 mg/ml (polyploidy)

Genotoxic effects:
clastogenicitypolyploidy
+?-+?-
Without metabolic activation:[*][ ][ ][*][ ][ ]
With metabolic activation:[*][ ][ ][ ][*][ ]

1)The test was performed by Nihon Bioresearch Inc. Hashima Laboratory, 6-104 Majima, Fukuju-cho, Hashima, Gifu, 501-62 Japan Tel +81-58-392-6222 Fax +81-58-391-3171
2)The tests were performed by the Hatano Research Institute, Food and Drug Safety Center, 729-5 Ochiai, Hadano-shi, Kanagawa, 257, Japan. Tel +81-463-82-4751 Fax +81-463-82-9627