Reaction mass of 2-O-α-L-Rhamnopyranosyl-α-L-rhamnopyranosyl-β-hydroxydecanoyl-β-hydroxydecanoic acid and α-L-Rhamnopyranosyl-β-hydroxydecanoyl-β-hydroxydecanoic acid

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Determination of the surface tension (mN/m) was carried out by the du Noüy ring method. It is a method for measuring the surface tension of a liquid and the interfacial tension between two liquids.
The force referred to the wetted length acting on a ring as a result of the tension of the withdrawn liquid lamella when moving the ring from one phase to another is measured in this method.

References:
[1]. L. du Noüy, J. General Physiol. 1919, p.1521
[2]. W.D. Harkins and H.F. Jordan, J. Am. Chem. Soc., 1930, Vol.52, p.1751
[3] C. Huh C and S.G. Mason, Colloid Polymer Sci.,1975, Vol. 253, p.566.

GLP compliance:

no

Type of method:

other: Du Noüy ring method

Test material

Test material information

Constituent 1

Reference substance name:

Reaction mass of 2-O-α-L-Rhamnopyranosyl-α-L-rhamnopyranosyl-β-hydroxydecanoyl-β-hydroxydecanoic acid and α-L-Rhamnopyranosyl-β-hydroxydecanoyl-β-hydroxydecanoic acid

EC Number:

604-610-3

Cas Number:

147858-26-2

IUPAC Name:

Reaction mass of 2-O-α-L-Rhamnopyranosyl-α-L-rhamnopyranosyl-β-hydroxydecanoyl-β-hydroxydecanoic acid and α-L-Rhamnopyranosyl-β-hydroxydecanoyl-β-hydroxydecanoic acid

Test material form:

liquid

Results and discussion

Surface tension

Key result

Surface tension:

>= 28.3 - <= 29.3 mN/m

Temp.:

20 °C

Conc.:

100 mg/L

Remarks on result:

other: arithmetic mean of 20 determinations

Any other information on results incl. tables

- Ring: circumference = 60 mm; radius = ~9,55 mm

- Calibration: A calibration using pure water was performed. The surface tension of pure water was 72,8 mN/m at this.

- Correction factor: It was not necessary to apply a correction factor because the surface tension of pure water was not different from 72,8 mN/m. According to the manual a correction factor should be only applied, if there is a differenece.

- Time dependence of the measured surface tension after transferring the solution to the measurement vessel: The solution of measurement vessel was allowed to equilibrate at 25˚C for 5 min.

Applicant's summary and conclusion

Conclusions:

- surface tension: 28.8 +/- 0.5 mN/m
- surface tension lower than 60 mN/m: the substance should be regarded as surface-active material

Executive summary:

The surface tension of the test material was determined using the du Noüy ring method on the force tensiometer K6 (by Krüss GmbH): 28.8 +/- 0.5 mN/m at 20°C (arithmetic mean of 20 determinations).

The test material is considered to be a surface-active material by definition of EU-Method A.5 (since the value is less than 60 mN/m).