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EC number: 406-880-6 | CAS number: 88917-22-0 ACETATE DPMA ACROSOLV; ACROSOLV DPMA ACETAT; ACROSOLV DPMA ACETATE; DOWANOL DPMA; DOWANOL DPMA GLYCOL ETHER; DOWANOL DPMA GLYKOL ETHER; ETHER DE GLYCOL DPMA DOWANOL
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Basic toxicokinetics
Administrative data
- Endpoint:
- basic toxicokinetics in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 01/2011-03/2011
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP-study with well described method.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 011
Materials and methods
- Objective of study:
- metabolism
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- This study was designed to investigate the rate of in vitro hydrolysis of dipropylene glycol methyl ether acetate (DPMA) in rat whole blood and rat liver S9 fraction under physiological conditions and compared with its shorter-chain analog, propylene glycol methyl ether (PMA). Additionally, tissue:plasma partition coefficients of the plasma protein unbound DPMA and its possible metabolite dipropylene glycol methyl ether (DPM) and a shorter-chain analog (PMA) were predicted using quantitative structure activity relationship (QSAR) prediction software for a series of tissues (i.e., brain, heart, lung, muscle, skin, intestine, spleen and bone).
- GLP compliance:
- yes (incl. QA statement)
Test material
- Details on test material:
- - Name of test material (as cited in study report): Dipropylene Glycol Methyl Ether Acetate (DPMA) (CASRN 88917-22-0 for mixture of isomers)
- Physical state: liquid
- Analytical purity: 99.8% by weight :
- Purity test date:
- Lot/batch No.:
Constituent 1
- Radiolabelling:
- no
Test animals
- Species:
- rat
- Strain:
- Fischer 344
- Sex:
- male
- Details on test animals or test system and environmental conditions:
- Rat (male Fischer 344) liver S9 fraction was purchased from XenoTech, LLC (Lenexa, KS). Blood from control male Fischer 344 rats was collected at TERC. All related animal handling and sample collection guidelines were followed.
Administration / exposure
- Details on exposure:
- not applicable
- Duration and frequency of treatment / exposure:
- not applicable
Doses / concentrations
- Remarks:
- Doses / Concentrations:
in vitro: 38 and 380 µM
- No. of animals per sex per dose / concentration:
- not applicable
- Positive control reference chemical:
- not applicable
- Details on study design:
- see below
- Details on dosing and sampling:
- see below
- Statistics:
- Descriptive statistics (i.e., mean ± standard deviation) are reported. All calculations in the database were conducted using Microsoft Excel (Microsoft Corporation, Redmond, Washington) spreadsheets and databases in full precision mode (15 digits of accuracy). The rate of hydrolysis was determined using first-order disappearance of DPMA and PMA from the incubation mixtures using Microsoft Excel spreadsheets based kinetic program (PKSolver).
Results and discussion
- Preliminary studies:
- not applicable
Any other information on results incl. tables
In Vitro Hydrolysis of propylene glycol methyl ether acetate (PMA) and dipropylene glycol methyl ether acetate (DPMA)
The time-course of disappearance of PMA and DPMA from rat whole blood and rat liver S9 are shown in Figures 1 and 2. The data of the individual incubations are presented in Tables 1 and 2. Hydrolysis of PMA was very rapid, both from the rat whole blood and rat liver S9 fraction, as expected from earlier data (Dow 2001). The rate of disappearance was same for the low (5 ppm) and high (50 ppm) concentrations in both matrices (Tables 1 and 2). The first-order rate constants of disappearance of PMA was 0.04 min-1 at the low and between 0.05-0.06 min-1 at the high concentration. The half life was between 11 and 18 min (Tables 1 and 2; Figures 1 and 2).
Hydrolysis of both of the major isomers of DPMA (isomers A and B*) was very rapid in whole blood; in almost all cases faster than the hydrolysis of PMA (only one out of the total of twelve incubations was slower than PMA) (Table 1, Figure 1). The first-order rate constant of disappearance of DPMA-A and DPMA-B from rat whole blood was 0.06-0.07 min-1 (t½ = 10-12 min) and 0.04-0.05 min-1 (t½ = 13-17 min), respectively without any dose dependency (Table 1, Figure 1). This was consistent with the hypothesis that the rate of hydrolysis increases with the increase in the length of the aliphatic chain of glycol acetate. Disappearance of DPMA from the rat liver S9 fractions, however, was slower than the disappearance of PMA (Table 2, Figure 2). The rate constant of disappearance of PMA from the rat liver S9 was 0.04-0.06 min-1 (t½ = 11-18 min) and of both of the DPMA isomers was 0.01-0.02 min-1 (t½ = 40-50 min for DPMA-A and 58-82 min for DPMA-B) (Table 2, Figure 2). The hydrolysis of DPMA in the rat liver S9 fraction was 3- to 5-fold slower than that of PMA. The hydrolysis of PMA was consistent with the earlier report (Dow 2001) in both blood and S9. Hydrolysis of DPMA was comparable with PMA only in the whole blood.
In order to better understand the behavior of DPMA in a biological system, tissue to plasma partition coefficients were determined in situ (Table 3) using a modification of the method described by Poulin and Theil (2000). For comparison, the same parameters were also determined for its expected metabolites, DPM and a shorter-chain analog, PMA. The model used log Kow of DPMA, DPM and PMA (which was between 0.05 and 0.6 for all three) and their unbound fraction in the plasma. The Kow of the three compounds was obtained from the Material Safety Data Sheets and plasma binding was estimated in situ using ADME Suite. Consistent with the physicochemical properties of glycol ether and acetate (high water soluble neutral molecules), most of the parent compounds remained free (unbound) in the plasma; plasma protein binding of the three test materials was between 7 and 21% (Table 3). The tissue:plasma partition coefficient of DPMA was ≤0.80 in all tissues (adipose, brain, heart, lung, muscle, skin, spleen) estimated, which was similar to that estimated for DPM and PMA (Table 3). On the basis of the tissue:plasma partition coefficient, DPMA is expected to have short residence time in tissues and no accumulation, similar to the estimated low volume of distribution (Vd = 1.0-1.2 L/kg) of the three compounds in humans (Table 3).
On the basis of these results, DPMA is expected to rapidly hydrolyze once absorbed. Higher hydrolysis is expected prior to absorption in cases of oral exposure. The overall rate of hydrolysis of DPMA in biological systems is expected to be similar to that of PMA, which is supported by the similarities in log Kow, predicted plasma protein binding, estimated tissue:plasma partition coefficients and volume of distribution. Although, DPMA was slowly hydrolyzed by the liver S9, the overall impact of this slow hydrolysis will likely be limited due to its low tissue partition coefficient and restriction of the absorbed DPMA mostly to the blood, where it is rapidly hydrolyzed.
*DPMA isomer A: 2-(2-methoxy-1-methylethoxy)-1-methylethyl acetate
*DPMA isomer B: 2-(2-methoxypropoxy)-1-methylethyl acetate
Applicant's summary and conclusion
- Conclusions:
- On the basis of these results, DPMA is expected to rapidly hydrolyze once absorbed. The overall rate of hydrolysis of DPMA in biological systems is expected to be similar to that of PMA, which is supported by the similarities in log Kow, plasma protein binding, tissue:plasma partition coefficients and volume of distribution. Although, DPMA was slowly hydrolyzed by the liver S9, the overall impact of this slow hydrolysis will likely be limited due to its low tissue partition coefficient and restriction of the absorbed DPMA mostly to the blood, where it is rapidly hydrolyzed.
- Executive summary:
This study was designed to determine the rate of in vitro hydrolysis of dipropylene glycol methyl ether acetate (DPMA) in rat whole blood and rat liver S9 fraction under physiological conditions and compared with its shorter-chain analog, propylene glycol methyl ether acetate (PMA). Additionally, tissue:plasma partition coefficients of the plasma protein unbound DPMA and its possible metabolite dipropylene glycol methyl ether (DPM) and PMA were estimated in situ for comparison. Two concentrations (38 and 380 µM) of DPMA and PMA were incubated separately with rat whole blood or rat liver S9 fraction under physiological conditions. The rate of hydrolysis was determined by sequential sampling and analysis of the incubation mixture at 0, 1, 2, 5, 10, 15, 30, and 60 minutes for the disappearance of the two major isomers of DPMA or PMA by GC/MS. Tissue to plasma partition coefficient of the unbound fraction of DPMA and PMA was estimated in situ using their physiochemical properties.
Hydrolysis of PMA was very rapid, both from the rat whole blood and rat liver S9 fraction without any dose dependency. The first-order rate constants of disappearance of PMA in both matrices was 0.04 min-1 at the low and between 0.05-0.06 min-1 at the high concentration resulting in its disappearance t½ to be between 11 and 18 min. Hydrolysis of both of the major isomers of DPMA was faster (t½ DPMA-A = 10-12 min; DPMA-B = 13-17 min) than PMA in whole blood. However, hydrolysis of DPMA from the rat liver S9 fractions was 3- to 5-fold slower (t½ DPMA-A = 40-50; DPMA-B = 58-82 min) than that of PMA.
Consistent with the physiochemical properties of glycol ether and acetate (high water soluble neutral molecules), plasma binding was estimated to be only 7-21%, which resulted in the tissue:plasma partition coefficient of ≤0.80 in all tissues for DPMA, DPM and PMA. Similarly, all three test materials had low volume of distribution (Vd = 1.0-1.2 L/kg).
On the basis of these results, DPMA is expected to rapidly hydrolyze once absorbed. The overall rate of hydrolysis of DPMA in biological systems is expected to be similar to that of PMA, which is supported by the similarities in log Kow, plasma protein binding, tissue:plasma partition coefficients and volume of distribution. Although, DPMA was slowly hydrolyzed by the liver S9, the overall impact of this slow hydrolysis will likely be limited due to its low tissue partition coefficient and restriction of the absorbed DPMA mostly to the blood, where it is rapidly hydrolyzed.
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