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EC number: 276-380-9
CAS number: 72140-65-9
1. MTDID 15670 Cation Hydrolysis in pH 7 buffer and 4°C
Spiked conc. (µg/mL)
Average measured conc. (μg/mL) *
% of the cation remaining
1 (20 min)
2 (2 h)
3 (4 h)
4 (6 h)
5 (8 h)
6 (10 h)
of triplicate samples
2. MTDID 15670 Cation Hydrolysis in pH 4 Buffer and 4 °C
Average measured conc. (μg/mL)*
% of cation remaining
3. MTDID 15670 Cation Hydrolysis in pH 4 Buffer and 50 °C
7 (12 h)
8 (24 h)
of triplicate samples
Hydrolysis of MTDID 15670 was investigated according to OECD 111
guideline “Hydrolysis as a Function of pH”.
MTDID 15670 MTDID 15670 is composed of an organic sulfonium (cation)
component and an inorganic tetrafluoroborate (anion) component. Both
were evaluated for hydrolytic stability during this study. Triplicate
samples were prepared at three pHs (4, 7, and 9) and at three different
temperatures (4°C, 23°C, and 50°C). For each pH and temperature
combination, a minimum of six discrete time points (from 20 minutes to
10 hours) after initial dosing of the test system were prepared. MTDID
15670 cation and anion concentrations in aqueous buffer systems were
measured separately using LC/MS/MS. The hydrolysis rate and the
half-life values (t1/2) were calculated based on assumption of first
LC/MS/MS signal for the anion was significantly depressed in all three
pH buffers (< 35%) after sample preparation at ambient temperature; the
low recoveries of anion in all pH buffers prohibited a reliable
hydrolysis evaluation of the anion, therefore it was not evaluated
further in this study.
MTDID15670 cation is hydrolytically unstable, the hydrolytic rate
constant and resultant half-life are dependent on pH and temperature.
The half-life of the cation at pH 7 was 2.08 hours at 4 °C, but was too
fast to be accurately determined at 23°C and was not evaluated at 50°C.
The half-life of the cation at pH 4 was 44.4 hours at 4°C, and 4.59 h at
50°C, but was not evaluated at 23°C. The hydrolysis of cation at pH 9
was too rapid at 4°C and 23°C to obtain any accurate kinetic
measurements, and was not performed at 50 °C. The hydrolysis products of
the cation were identified in another study by NMR to be crotononitrile
(cis and trans isomers) and dodecyl ethyl sulfide by 1D and 2D 1H- and
The hydrolysis study is conducted according to OECD guideline but not in
compliance with GLP. This study is considered reliable with restriction
and a key study.
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