Alanine, N-(1-oxobutyl)-

Genetic toxicity: in vitro

Administrative data

Endpoint:

in vitro gene mutation study in bacteria

Remarks:

Type of genotoxicity: gene mutation

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2000

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2000

Report date:

2000

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 471 (Bacterial Reverse Mutation Assay)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.5100 - Bacterial Reverse Mutation Test (August 1998)

Deviations:

no

GLP compliance:

yes

Type of assay:

bacterial reverse mutation assay

Test material

Test material information

Constituent 1

Reference substance name:

N-butyrylalanine

EC Number:

611-909-2

Cas Number:

59875-04-6

Molecular formula:

C7 H13 N O3

IUPAC Name:

N-butyrylalanine

Method

Target gene:

Histidine gene locus

Species / strain

Species / strain / cell type:

S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and TA 102

Additional strain / cell type characteristics:

not applicable

Metabolic activation:

with and without

Metabolic activation system:

Aroclor 1254 induced male rat liver S9 mix

Test concentrations with justification for top dose:

0, 50, 158, 500, 1581, 5000 µg/plate and µg/tube (+/-S9 mix, all strains)

Vehicle / solvent:

deionized water

Controls

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

other: sodium azide (only TA 1535), nitrofurantoin (only TA 100), 4-nitro-1,2-phenylene diamine (TA 1537 and TA 98), cumene hydroperoxide (only TA 102), 2-aminoanthracene.

Remarks:

The positive controls sodium azide, nitrofurantoin, 4-nitro-1,2-phenylene diamine and cumene hydroperoxide were only used without S9 mix; the positive control 2-aminoanthracene was only used with S9 mix.

Details on test system and experimental conditions:

METHOD: Standard plate test and preincubation test; each concentration including the controls was tested in triplicate.

Evaluation criteria:

A reproducible and dose-related increase in mutant counts of at least one strain is considered to be a positive result. For TA 1535, TA 1537, TA 100 and TA 98 this increase should be about twice that of negative controls. For TA 102 an increase of about 100 mutants should be reached. Otherwise, the result is evaluated as negative. However, these criteria may be overruled by good scientific judgment. In case of questionable results, investigations should continue, possibly with modifications, until a final evaluation is possible.

Statistics:

not specified

Results and discussion

Test results

Species / strain:

S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and TA 102

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

weak strain-specific bacteriotoxic effect at 5000 µg/plate, however this dose could nevertheless be used for assessment purposes

Vehicle controls validity:

valid

Untreated negative controls validity:

not applicable

Positive controls validity:

valid

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Any other information on results incl. tables

Table 1: Summary of results from the Salmonella mutagenicity assay with Ethoxyamidin without S9 mix (mean values of revertants per plate)

Dose (µg per plate)	Without metabolic activation
	TA 1535	TA 100	TA 1537	TA 98	TA 102
0	8	81	8	31	182
50	7	80	9	33	156
158	8	72	7	39	166
500	10	83	8	36	180
1581	8	74	7	33	186
5000	10	76	8	30	189
Positive control	704	198	145	173	346
Dose ( µg per tube)	Without metabolic activation
	TA 1535	TA 100	TA 1537	TA 98	TA 102
0	12	95	9	23	258
50	10	115	11	20	278
158	13	107	9	23	255
500	17	89	10	26	247
1581	13	111	10	19	254
5000	12	99	9	18	244
Positive control	818	255	163	189	592

Table 2: Summary of results from the Salmonella mutagenicity assay with Ethoxyamidin with S9 mix (mean values of revertants per plate)

Dose (µg per plate)	With metabolic activation (liver S9 mix)
	TA 1535	TA 100	TA 1537	TA 98	TA 102
0	12	107	11	39	253
50	10	88	8	41	277
158	12	113	7	45	295
500	10	107	11	37	284
1580	11	100	8	45	258
5000	11	102	10	34	282
Positive control	317	1702	397	1820	490
Dose ( µg per tube)	With metabolic activation (liver S9 mix)
	TA 1535	TA 100	TA 1537	TA 98	TA 102
0	18	112	13	30	338
50	12	113	13	33	319
158	11	104	12	37	345
500	14	113	14	35	346
1580	11	113	12	35	329
5000	12	105	12	33	296
Positive control	275	1640	334	1513	546

 

 

Doses up to and including 1580 µg per plate did not cause any bacteriotoxic effects. Total bacteria counts remained unchanged and no inhibition of growth was observed. At 5000 µg the substance had a weak strain-specific bacteriotoxic effect, not limiting evaluation.

No evidence of mutagenic activity was seen in any tester strain with and without metabolic activation.

The positive controls sodium azide, nitrofurantoin, 4-nitro-1,2-phenylene diamine, cumene hydroperoxide and 2-aminoanthracene had a marked mutagenic effect, as was seen by a biologically relevant increase in mutant colonies compared to the corresponding negative controls.

Applicant's summary and conclusion

Conclusions:

Interpretation of results (migrated information):
negative

Executive summary:

The mutagenic potential of Butanoylanilin was evaluated in a Salmonella/microsome test with the S. typhimurium strains TA 98, TA 100, TA 102, TA 1535 and TA 1537 in the presence and absence of S9 mix according to OECD TG 471. Doses up to and including 1580 µg per plate did not cause any bacteriotoxic effects. At 5000 µg/plate a weak strain-specific bacteriotoxic effect occurred, which however did not affect assessment purposes. No evidence of mutagenic activity was seen in the treated cultures with and without S9 -mix. Thus, the test item can be considered as non- mutagenic in the Ames Test.