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Description of key information

The skin sensitization potential of target chemical Anisoyl chloride (CAS No: 100-07-2) was assessedin various experimental studies which were conducted on guinea pigs for target chemicalAnisoyl chloride (CAS No: 100-07-2) andits structurally similar read across substancesp-Anisaldehyde (CAS No: 123-11-5)andAnisic alcohol (CAS No: 105-13-5). The predicted data usingQSAR toolboxhas also been compared with the experimental data.Based on the available data for the target and read across substances and applying the weight of evidence approach, it can be concluded that chemical Anisoyl chloride (CAS No: 100-07-2) is unable to cause skin sensitization and thus can be considered as not sensitizing. Comparing the above annotations with the criteria of CLP regulation, it can be classified under the category “Not Classified”.

Key value for chemical safety assessment

Skin sensitisation

Link to relevant study records
Reference
Endpoint:
skin sensitisation
Remarks:
in vivo
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
Justification for type of information:
Data is from OECD QSAR toolbox version 3.3 and QMRF report has been attached
Qualifier:
according to guideline
Guideline:
other: estimated data
Principles of method if other than guideline:
Prediction is done using QSAR Toolbox version 3.3
GLP compliance:
not specified
Type of study:
guinea pig maximisation test
Justification for non-LLNA method:
not specified
Specific details on test material used for the study:
- IUPAC name: Anisoyl chloride
- Common name: 4-Methoxybenzoyl Chloride
- Molecuar formula: C8H7ClO2
- Molecular weight: 170.5943 mg/l
- Smiles: c1(ccc(cc1)OC)C(=O)Cl
- Inchl: 1S/C8H7ClO2/c1-11-7-4-2-6(3-5-7)8(9)10/h2-5H,1H3
- Substance type: Organic
Species:
guinea pig
Strain:
Dunkin-Hartley
Sex:
not specified
Details on test animals and environmental conditions:
No data available
Route:
intradermal and epicutaneous
Vehicle:
not specified
Concentration / amount:
No data available
Day(s)/duration:
No data available
Adequacy of induction:
not specified
No.:
#1
Route:
epicutaneous, occlusive
Vehicle:
not specified
Concentration / amount:
No data available
Day(s)/duration:
24 hours
Adequacy of challenge:
not specified
No. of animals per dose:
10
Details on study design:
No data available
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
No data available
No. with + reactions:
0
Total no. in group:
10
Clinical observations:
No skin sensitization was observed in treated guinea pigs.
Remarks on result:
no indication of skin sensitisation
Cellular proliferation data / Observations:
No skin sensitization was observed in treated guinea pigs.

The prediction was based on dataset comprised from the following descriptors: "Skin Sensitisation"
Estimation method: Takes highest mode value from the 6 nearest neighbours
Domain  logical expression:Result: In Domain

((((((((((("a" or "b" or "c" or "d" )  and ("e" and ( not "f") )  )  and ("g" and ( not "h") )  )  and "i" )  and ("j" and ( not "k") )  )  and ("l" and ( not "m") )  )  and ("n" and ( not "o") )  )  and ("p" and ( not "q") )  )  and ("r" and ( not "s") )  )  and "t" )  and ("u" and "v" )  )

Domain logical expression index: "a"

Referential boundary: The target chemical should be classified as Acyl chloride OR Acyl halide OR Alkylarylether OR Aromatic compound OR Carbonic acid derivative OR Carboxylic acid derivative OR Ether OR Halogen derivative by Organic functional groups, Norbert Haider (checkmol) ONLY

Domain logical expression index: "b"

Referential boundary: The target chemical should be classified as Aliphatic Carbon [CH] OR Aliphatic Carbon [-CH2-] OR Aliphatic Carbon [-CH3] OR Aromatic Carbon [C] OR Carbonyl, olefinic attach [-C(=O)-] OR Carbonyl, one aromatic attach [-C(=O)-] OR Chlorine, olefinic attach [-Cl] OR Miscellaneous sulfide (=S) or oxide (=O) OR Olefinic carbon [=CH- or =C<] OR Oxygen, one aromatic attach [-O-] by Organic functional groups (US EPA) ONLY

Domain logical expression index: "c"

Referential boundary: The target chemical should be classified as Acyl halide OR Aryl OR Ether OR Overlapping groups by Organic Functional groups (nested) ONLY

Domain logical expression index: "d"

Referential boundary: The target chemical should be classified as Acyl halide OR Aryl OR Ether by Organic Functional groups ONLY

Domain logical expression index: "e"

Referential boundary: The target chemical should be classified as (!Undefined)Group All Lipid Solubility < 0.01 g/kg by Skin irritation/corrosion Exclusion rules by BfR

Domain logical expression index: "f"

Referential boundary: The target chemical should be classified as (!Undefined)Group C Surface Tension > 62 mN/m OR (!Undefined)Group CN Lipid Solubility < 0.4 g/kg OR (!Undefined)Group CNHal Lipid Solubility < 4 g/kg OR (!Undefined)Group CNHal Lipid Solubility < 400 g/kg OR (!Undefined)Group CNS Surface Tension > 62 mN/m OR Exclusion rules not met OR Group All log Kow < -3.1 OR Group All log Kow > 9 OR Group All Melting Point > 200 C OR Group C Aqueous Solubility < 0.0001 g/L OR Group C Melting Point > 55 C OR Group C Molecular Weight > 350 g/mol OR Group C Vapour Pressure < 0.0001 Pa OR Group CHal Melting Point > 65 C OR Group CN Aqueous Solubility < 0.0001 g/L OR Group CN Aqueous Solubility < 0.1 g/L OR Group CN log Kow > 4.5 OR Group CN log Kow > 5.5 OR Group CN Melting Point > 180 C OR Group CN Molecular Weight > 290 g/mol OR Group CN Molecular Weight > 540 g/mol OR Group CN Vapour Pressure < 0.001 Pa OR Group CNHal Aqueous Solubility < 0.1 g/L OR Group CNS Melting Point > 50 C by Skin irritation/corrosion Exclusion rules by BfR

Domain logical expression index: "g"

Referential boundary: The target chemical should be classified as Substituted benzoic acid halogenides by Skin irritation/corrosion Inclusion rules by BfR

Domain logical expression index: "h"

Referential boundary: The target chemical should be classified as Acyl halides by Skin irritation/corrosion Inclusion rules by BfR

Domain logical expression index: "i"

Referential boundary: The target chemical should be classified as Bioavailable by Lipinski Rule Oasis ONLY

Domain logical expression index: "j"

Referential boundary: The target chemical should be classified as Group 14 - Carbon C AND Group 16 - Oxygen O AND Group 17 - Halogens Cl AND Group 17 - Halogens F,Cl,Br,I,At by Chemical elements

Domain logical expression index: "k"

Referential boundary: The target chemical should be classified as Group 1 - Alkali Earth Li,Na,K,Rb,Cs,Fr by Chemical elements

Domain logical expression index: "l"

Referential boundary: The target chemical should be classified as Group 14 - Carbon C AND Group 16 - Oxygen O AND Group 17 - Halogens Cl AND Group 17 - Halogens F,Cl,Br,I,At by Chemical elements

Domain logical expression index: "m"

Referential boundary: The target chemical should be classified as Group 14 - Metals Sn,Pb by Chemical elements

Domain logical expression index: "n"

Referential boundary: The target chemical should be classified as Group 14 - Carbon C AND Group 16 - Oxygen O AND Group 17 - Halogens Cl AND Group 17 - Halogens F,Cl,Br,I,At by Chemical elements

Domain logical expression index: "o"

Referential boundary: The target chemical should be classified as Group 15 - Phosphorus P by Chemical elements

Domain logical expression index: "p"

Referential boundary: The target chemical should be classified as Group 14 - Carbon C AND Group 16 - Oxygen O AND Group 17 - Halogens Cl AND Group 17 - Halogens F,Cl,Br,I,At by Chemical elements

Domain logical expression index: "q"

Referential boundary: The target chemical should be classified as Group 4 - Trans.Metals Ti,Zr,Hf by Chemical elements

Domain logical expression index: "r"

Referential boundary: The target chemical should be classified as Group 14 - Carbon C AND Group 16 - Oxygen O AND Group 17 - Halogens Cl AND Group 17 - Halogens F,Cl,Br,I,At by Chemical elements

Domain logical expression index: "s"

Referential boundary: The target chemical should be classified as Group 16 - Sulfur S by Chemical elements

Domain logical expression index: "t"

Referential boundary: The target chemical should be classified as Acyl chloride AND Acyl halide AND Alkylarylether AND Aromatic compound AND Carbonic acid derivative AND Carboxylic acid derivative AND Ether AND Halogen derivative by Organic functional groups, Norbert Haider (checkmol) ONLY

Domain logical expression index: "u"

Parametric boundary:The target chemical should have a value of log Kow which is >= 0.437

Domain logical expression index: "v"

Parametric boundary:The target chemical should have a value of log Kow which is <= 3.02

Interpretation of results:
other: Not sensitizing
Conclusions:
The chemical Anisoyl chloride (CAS No: 100-07-2) was estimated to be not sensitizing to the Dunkin-Hartley guinea pigs. Based on the estimated result Anisoyl chloride (CAS No: 100-07-2) failed to induce skin sanitization effects and hence is considered to be not sensitizing to Dunkin-Hartley guinea pigs.
Executive summary:

The skin sensitization potential of Anisoyl chloride (CAS No: 100-07-2) was estimated using OECD QSAR toolbox version 3.3 with log Pow as the primary descriptor. The chemical Anisoyl chloride (CAS No: 100-07-2) was estimated to be not sensitizing to the Dunkin-Hartley guinea pigs. Based on the estimated result Anisoyl chloride (CAS No: 100-07-2) failed to induce skin sanitization effects and hence is considered to be not sensitizing to Dunkin-Hartley guinea pigs and can be classified under the category ˋ Not Classified’ as per CLP regulation. 

Endpoint conclusion
Endpoint conclusion:
no adverse effect observed (not sensitising)
Additional information:

Various studieshas been investigated for the test chemicalAnisoyl chloride (CAS No: 100-07-2)to observe the potential for skin sensitization to a greater or lesser extent. The studies are based on in vivo experiments in guinea pigs for target chemicalAnisoyl chloride (CAS No: 100-07-2) and its structurally similar read across substancesp-Anisaldehyde (CAS No: 123-11-5)andAnisic alcohol (CAS No: 105-13-5).The predicted data using the OECD QSAR toolbox has also been compared with the experimental data and summarized as below;

 

The skin sensitization potential of Anisoyl chloride (CAS No: 100-07-2) was estimated by SSS (2017) using OECD QSAR toolbox v3.3 with log kow as the primary descriptor. The substance Anisoyl chloride (CAS No: 100-07-2) failed to induce skin sanitization effects on guinea pig skin and hence is considered to be not sensitizing to the skin.

 

The G. Klecak (1985) conducted an Open Epicutaneous Test (OET) on guinea pigs to assess the skin sensitization potential ofstructurally similar read across substancep-Anisaldehyde (CAS No: 123-11-5).On day 1 during induction, 0.1 ml of the p-Anisaldehyde was applied at concentrations of 100%, 30%, 10%, 3%, 1%, or 0.3% in vehicle to an area measuring 8 cm2 on the clipped flank skin of the guinea pigs. The applications are repeated daily for 3 weeks or done 5 times weekly during 4 weeks, usually on the same skin sites. The application sites were left uncovered and the reactions, if continuous daily applications were performed, can be read 24 h after each application, or at the end of each week. To determine whether or not contact sensitization was induced, all groups of guinea pigs previously treated for 21 days, as well as 10 untreated, or only pretreated with the vehicle, controls are tested on days 21 and 35 on the contralateral flank with the test material. This test was performed by applying with a pipette 0.025 ml of each concentration to skin areas measuring 2 cm2. The reactions were read after 24,48 and/or 72h. It was observed that none of the guinea pigs induced contact sensitization at challenge concentration of 10%.Thus the chemicalp-Anisaldehyde (CAS No: 123-11-5) was considered to be not sensitizing on skin of guinea pigs at concentration of 10 % in an Open Epicutaneous Test (OET).

 

The above results were further supported by the experimental study conducted byD.W. SHARP {Toxicology, 9 (1978) 261-271} forread across substanceAnisic alcohol (CAS No: 105-13-5)in 10 Inbred Hartley strain albino the guinea pigs according modified Draize sensitization test which supports the above mentioned result.The preliminary irritation tests were done in guinea pigs to determine concentrations suitable for sensitization testing [injection challenge concentration (ICC) and application challenge concentration(ACC) ]. In the induction phase,the total dose was administered on one occasion as 4 intradermal injections, each 2.5 times the ICC (2.5X 0.25). Fourteen days later each animal was challenged intradermally in one flank and topically in the other with 0.1 ml aliquots of test substance at the respective ICC and ACC (0.25 and 10 respectively). Twenty-four hours later the reactions were observed. In the absence of sensitization reactions at first challenge the induction and challenge procedures were repeated, andapparent sensitization reactions confirmed 7 days later by a second challenge with controls included. Based upon the second challenge, it can be concluded that theAnisic alcohol (CAS No: 105-13-5)was considered to be non-sensitizingto the skin of albino Hartley guinea pigs at 0.25% ICC and 10% ACC concentrations.

 

 

Based on the available data for thetargetAnisoyl chloride (CAS No: 100-07-2) and its structurally similar read across substancesp-Anisaldehyde (CAS No: 123-11-5)andAnisic alcohol (CAS No: 105-13-5),it can be concluded thatchemical Anisoyl chloride (CAS No: 100-07-2) is unable to cause skin sensitization and considered as non-skin sensitizer.

Respiratory sensitisation

Endpoint conclusion
Endpoint conclusion:
no study available

Justification for classification or non-classification

The skin sensitization potential of test substance Anisoyl chloride (CAS No: 100-07-2) and its structurally similar read across substancesp-Anisaldehyde (CAS No: 123-11-5) and Anisic alcohol (CAS No: 105-13-5) were observed in various studies. From the results obtained from these studies it is concluded that the chemical Anisoyl chloride (CAS No: 100-07-2) is not likely to cause skin sensitization and hence can be classified as non-skin sensitizer.