Cinnamomum zeylanicum, ext.

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

July 14, 2010 / July 28, 2010

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

GLP compliance:

no

Type of method:

ring method

Test material

Test material information

Constituent 1

Reference substance name:

Cinnamomum zeylanicum, ext.

EC Number:

283-479-0

EC Name:

Cinnamomum zeylanicum, ext.

Cas Number:

84649-98-9

Molecular formula:

Not Applicable due to UVCB

IUPAC Name:

Cinnamomum zeylanicum, ext.

Details on test material:

Identification: Cinnamon Leaf Oil - Cinnamomum Zeylancium

Purity: 100%
Expiry Date: June 30, 2012
Storage Conditions: At room temperature at about 20 °C

Results and discussion

Surface tension

Key result

Surface tension:

49.4 mN/m

Temp.:

20.1 °C

Remarks on result:

other: Concentration not available because the solution was saturated

Any other information on results incl. tables

The determination of the surface tension of an aqueous solution of Cinnamon Leaf Oil - Cinnamomum Zeylancium was based on the OECD Guideline No. 115: “Surface Tension of Aqueous Solutions” (1995) and on the EEC Directive 92/69, EEC Publication No. L383, December 1992 and the Council Regulation (EC) No. 440/2008, 30 May 2008, Part A, Methods for the determination of physico-chemical properties, A.5 “Surface tension”.

 

The calibration factor Φ_b was determined to be 1.0244 for double distilled water (Table 1). The data are part of Harlan Laboratories' instruments files and a copy is presented in the raw data of thepresent study.

 

Table2 shows the individual measurements for the surface tension of the aqueous test item solution. From these, the mean and the corrected value for the given solution were calculated and are also shown in Table2. The tabulated values represent rounded results obtained from calculation using the exact raw data.

Table1       Determination of the Calibration Factor Using Water

Time expired	Temperature	Surface tension [mN/m]		Calibration factor
		measured	mean value calculated from the bold values
[hours:min]	[°C]		σg	Φb
00:32	19.9	71.2	71.03	1.0244
00:34	19.9	71.2
00:35	19.9	71.0
00:36	19.9	71.0
00:37	19.9	70.9
00:38	19.9	70.9

 

 

with

 

σ_o     =      72.765 mN/m at 19.9 °C

Φ_b    =      σ_o/ σ_g

Φ_b    =      72.765 / 71.03 = 1.0244

 

where

 

Φ_b    =      calibration factor

σ_o     =      the surface tension of water at the test temperature

σ_g     =      measured value of the surface tension of waterat the test temperature

 

Table2       Determination of Surface Tension for the Test Item

Time expired	Temperature	Surface tension [mN/m]
		measured	mean value calculated from the bold values	mean value corrected for calibration	s1corrected for Harkins-Jordan
[hours:min]	[°C]	[mN/m]	(σ *)	(σ 1)	(σ )
First sample
00:33	20.4	49.6	49.35	50.55	49.18
00:34	20.4	49.3
00:35	20.4	49.3
00:36	20.4	49.3
00:37	20.4	49.3
00:38	20.4	49.3
Second sample
00:31	19.9	49.8	49.80	51.01	49.66
00:32	19.9	49.8
00:33	19.9	49.8
00:34	19.9	49.8
00:35	19.9	49.8
00:36	19.9	49.8

 

Mean value from both samples:                                                σ = 49.4 mN/m

 

with

σ* · Φ_b =  σ₁

Φ_b        =  calibration factor = 1.0244

and

σ₁· F_c   =  σ

F_c         =  factor for correction acc. to Harkins-Jordan
             =  0.973 for 50.55 mN/m and 0.974 for 51.01 mN/m

Applicant's summary and conclusion

Conclusions:

The surface tension of Cinnamon Leaf Oil - Cinnamomum Zeylancium in water (90% of saturation concentration) was determined to be 49.4 mN/m at 20.1 °C ± 0.3 °C. Based on the criteria as outlined in the EEC Guideline and the results of this study, Cinnamon Leaf Oil - Cinnamomum Zeylancium has to be considered as a surface active substance.

Executive summary:

The surface tension of Cinnamon Leaf Oil - Cinnamomum Zeylancium in water (90% of saturation concentration) was determined to be 49.4 mN/m at 20.1 °C± 0.3 °C. Based on the criteria as outlined in the EEC Guideline and the results of this study, Cinnamon Leaf Oil - Cinnamomum Zeylancium has to be considered as a surface active substance.