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EC number: 284-511-6 | CAS number: 84929-27-1 Extractives and their physically modified derivatives such as tinctures, concretes, absolutes, essential oils, oleoresins, terpenes, terpene-free fractions, distillates, residues, etc., obtained from Vitis vinifera, Vitaceae.
The solubility of the test item Palmitoyl grapevine shoot extract in water was determined by
measurement of DOC concentration in the filtrated test solutions using TOC analyser.
In the pre-test, flasks with nominal concentrations 10 mg/L and 1000 mg/L were shaken at
room temperature for 96 h and measured for DOC after membrane filtration (0.45 μm,
PTFE) and acidification. Undissolved particles were observed in the flasks. The measured
DOC concentration lay at 0.15 mg/L and below the LOQ of TOC (< 0.1 mg/L) in the flasks
with the nominal concentrations 1000 mg/L and 10 mg/L, respectively. As dependency of
the water solubility on the amount of the test item added was perceived, different loading
rates were used in the main test. According to the guideline the slow-stirring flask method
was used for the determination of the solubility of the test item in water.
In the main test, six different loading rates of the test item were chosen to study the effect
of the loading rate on the measured water solubility: 1, 3, 5, 6, 8 and 10 g/L. Three flasks
1A - C with the same loading rate (5 g/L) were used during equilibration. Seven vessels
(flasks blank, 1C (for the sampling point 72 h) and 2 – 6) were set onto the shaking apparatus
immediately and shaking at 100 rpm was started. After 24 ± 2 hours, flask 1B (for the
sampling point 48 h) and after 48 ± 2 hours, flask 1A (for the sampling point 24 h) were set
on the shaker and all flasks were shaken for further 24 ± 2 hours at room temperature.
Then, flasks 1A - 1C were removed from the shaker, tempered at 20 ± 0.5 °C, samples
were taken, membrane filtered and analysed for DOC via TOC analyser. Because of an
upward tendency, the test was prolonged and the flasks 1A – 1C were measured on days
4 – 8. Due to a difference of less than 15 % in the concentrations on days 7 and 8 and no
upward tendency in the last three values, the test was finished on day 8. The final measurement
was performed on day 8 as determination from flasks 2 – 6. DOC was measured
via TOC analyser in the saturated aqueous solutions.
No Tyndall effect (i.e. a laser beam was not scattered when transmitted through the liquid)
could be observed indicating that no colloidal dispersed particles were present.
As solubility was dependent on nominal concentration, no exact value for the solubility of
the test item in water can be stated:
0.32 – 1.56 mg/L at 19.5 °C
0.32 – 1.56 * 10-3 kg/m3 (SI units)
for the following nominal concentration range of the test item in water: 3 – 10 g/L.
The solubility of the test item was also stated as 0.013 % relating to the nominal concentration
of the test item (mean value).
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