(S)-2-(5-Oxo-3-propyl-1,2-dihydropyrrol-1-yl) butyramide

Appearance / physical state / colour

Administrative data

Endpoint:

appearance / physical state / colour

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03/01/2019 - 14/02/2019

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Reference

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03/01/2019 - 14/02/2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Version / remarks:

2009

Qualifier:

according to guideline

Guideline:

other: CIPAC MT 187 (Particle size analysis by laser diffraction)

Version / remarks:

Handbook K, 2007

Principles of method if other than guideline:

According to REACH Article 13(3) tests on substances shall be conducted in accordance with the test methods laid down in a Commission Regulation or in accordance with other international test methods recognised by the Commission or the Agency as being appropriate. No particle size distribution test method is laid down in regulation (EC) No 440/2008. OECD 110 TG ‘Particle Size Distribution/FibreLength and Diameter Distributions’ dates from 1981 and describes two methods in detail; both methods have restrictions and are not applicable to the entire size range. ECHA’s Guidance on information requirements and Chemical Safety Assessment-Chapter R.7a stipulates that many methods are available for particle size measurements but none of them is applicable to the entire size range. The guidance mentions Laser scattering/diffraction as a method for particles of all kind and makes reference to ISO 13320:2009.

According to Guidance document EUR 20268 (2002), the laser diffraction technique is applicable to particles of respirable and inhalable size. The MMAD can be calculated when density is known.

GLP compliance:

yes (incl. QA statement)

Type of method:

Laser scattering/diffraction

Type of particle tested:

primary particle

Type of distribution:

volumetric distribution

Specific details on test material used for the study:

Relative density: 1.10 (see Cross-reference)

Mass median aerodynamic diameter:

24.1 µm

Geometric standard deviation:

>= 2.524 - <= 2.565

Remarks on result:

other: MMAD and GSD above are both the average of 5 runs. GSD was calculated from d50/d15.78. The St.dev. in the table below is the population standard deviation [µm].

Key result

Percentile:

D10

Mean:

7.92 µm

St. dev.:

0.049

Key result

Percentile:

D50

Mean:

23 µm

St. dev.:

0.136

Key result

Percentile:

D90

Mean:

87.7 µm

St. dev.:

1.12

No.:

#1

Size:

< 10 µm

Distribution:

16 other: vol%

Coefficient of variation for D50 is < 3%; D10 and D90 are < 5%. These values are within the acceptable limits mentioned in the ISO 13320 standard.

Conclusions:

Particle size distribution of the substance: D10= 7.92 µm, D50= 23.0 µm and D90= 87.7 µm. 16% by volume was determined to be smaller than 10 µm. The MMAD was calculated to be 24.1 µm.

Executive summary:

Laser diffraction analysis (dry powder module) was performed in a GLP study according to ISO 13320 and CIPAC MT 187. The sample was tested as such. Each result is the average of five runs. Particle size distribution of the substance: D10= 7.92 µm, D50= 23.0 µm and D90= 87.7 µm. 16% by volume was determined to be smaller than 10 µm. The MMAD was calculated to be 24.1 µm.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2019

Report date:

2019

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Appearance was determined by visual observation.

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

(S)-2-(5-Oxo-3-propyl-1,2-dihydropyrrol-1-yl) butyramide

Cas Number:

357338-13-7

Molecular formula:

C11H18N2O2

IUPAC Name:

(S)-2-(5-Oxo-3-propyl-1,2-dihydropyrrol-1-yl) butyramide

Test material form:

solid: particulate/powder

Details on test material:

- Appearance: Off-white powder
- Storage condition of test material: In refrigerator protected from light

Specific details on test material used for the study:

The description of appearance was provided by the sponsor to the test facility and confirmed by trained personnel at the test facility.

Results and discussion

Physical state at 20°C and 1013 hPa:

solid

Form / colour / odour

Key result

Form:

solid: particulate/powder

Colour:

off-white

Odour:

other: not determined

Substance type:

organic

Applicant's summary and conclusion

Conclusions:

The substance is an off-white powder.