Tridodecylmethylammonium chloride (TDMAC) is a lipophilic quaternary ammonium salt used as an electroactive ionic component in chloride-selective solvent-polymeric membrane electrodes. Its permanently charged ammonium center and three dodecyl chains provide cationic sites within hydrophobic membrane phases, supporting anion-exchange response in potentiometric sensor formulations.
TDMAC is also used to prepare TDMAC-heparin complexes for surface-coating research involving catheters, tubing, and related polymeric substrates. Performance depends on the complete membrane or coating formulation, component concentrations, substrate, and processing conditions.
Synonyms: Methyltridodecylammonium chloride; tridodecyl methyl ammonium chloride; N,N-didodecyl-N-methyldodecan-1-aminium chloride.
Key Properties
- Lipophilic cationic quaternary ammonium chloride
- Electroactive ionic component for chloride-selective membrane electrodes
- CAS number: 7173-54-8
- Molecular formula: C37H78ClN
- Linear formula: [CH3(CH2)11]3N+CH3 Cl-
- Molecular weight: 572.49 g/mol
- Appearance: white waxy solid
- Melting point: 105–114°C
- Hygroscopic material
- Product specification includes appearance, melting-point, TLC, and FT-IR testing
- Polysciences catalog number: 01595
Applications
Chloride-Selective Membrane Electrodes
TDMAC is used in solvent-polymeric membranes for potentiometric chloride detection. The lipophilic quaternary ammonium cation provides positively charged sites within the membrane phase that support anion exchange and electrochemical response.
Ion-Selective Sensor Research
The reagent is used in the development and evaluation of chloride-selective liquid-membrane, coated-wire, and solid-contact electrode systems. Selectivity and response depend on the complete membrane composition, conditioning procedure, calibration method, and sample matrix.
Polymeric Membrane Formulation
TDMAC may be incorporated into compatible polymer, plasticizer, and solvent systems during the preparation of electroactive sensor membranes. Its concentration influences ionic-site density and should be optimized for the selected membrane architecture and analytical method.
TDMAC-Heparin Preparation
TDMAC is used to prepare tridodecylmethylammonium heparinate complexes for coating research involving catheters, tubing, and compatible polymeric surfaces. Complex preparation and coating conditions should follow an established technical procedure.
Membrane & Formulation Considerations
- TDMAC is a membrane component rather than a complete chloride-sensing formulation
- Optimize its concentration for the selected polymer matrix and plasticizer system
- Confirm compatibility with all membrane solvents, additives, and substrate materials
- Evaluate selectivity against potentially interfering anions
- Standardize membrane thickness, conditioning, calibration, and storage procedures
- Assess response slope, working range, detection limit, drift, and reproducibility
Electrode performance depends on the complete sensing system rather than TDMAC alone. Polymer composition, plasticizer, ionic-site concentration, membrane thickness, electrode construction, conditioning time, and sample composition can affect selectivity and potentiometric response.
Application Tips
- Protect the material from moisture during weighing and formulation
- Use clean, dry glassware and appropriate analytical equipment
- Accurately measure each membrane component according to the selected formulation
- Confirm complete and uniform incorporation into the membrane mixture
- Prepare comparison membranes when optimizing TDMAC concentration
- Condition and calibrate completed electrodes according to the validated analytical method
- Use appropriate control solutions to evaluate selectivity and response stability
Handling & Storage
- Store at room temperature in a cool, well-ventilated location
- Keep the container tightly closed when not in use
- Protect the material from moisture because it is hygroscopic
- Wear protective gloves, safety glasses, and suitable protective clothing
- Avoid contact with the skin and eyes
- Avoid breathing dust, fumes, mist, or vapors generated during handling
- Wash thoroughly after handling
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FAQ
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1. What is TDMAC used for?
TDMAC is primarily used as an electroactive ionic component in chloride-selective solvent-polymeric membrane electrodes. It is also used to prepare TDMAC-heparin complexes for specialized surface-coating research.
2. How does TDMAC function in a chloride-selective membrane?
The lipophilic quaternary ammonium cation provides positively charged sites within the hydrophobic membrane phase. These sites support anion exchange and contribute to the membrane’s potentiometric response to chloride.
3. Is TDMAC a cationic or amphoteric surfactant?
TDMAC is cationic. Its nitrogen atom carries a permanent positive charge, with chloride serving as the counterion. It is not an amphoteric surfactant.
4. Is TDMAC the same as tridodecyl methyl ammonium chloride?
Yes. TDMAC, tridodecylmethylammonium chloride, tridodecyl methyl ammonium chloride, and methyltridodecylammonium chloride refer to the same quaternary ammonium salt.
5. Is TDMAC a complete chloride-sensing membrane?
No. TDMAC is one electroactive component of a membrane formulation. A complete sensor typically requires a compatible polymer matrix, plasticizer, solvent system, electrode support, conditioning procedure, and calibration method.
6. Can TDMAC be used to prepare TDMAC-heparin?
Yes. TDMAC is used in the preparation of tridodecylmethylammonium heparinate complexes. The resulting complex has been used in coating research involving compatible catheter, tubing, and polymeric substrate materials.
7. What package sizes are available?
TDMAC is available in 1 g, 5 g, and 25 g package sizes. Larger-volume requirements may be submitted through the bulk-quote option.
Safety & Documentation
TDMAC can cause skin and serious eye irritation and may cause respiratory irritation. Use adequate ventilation and wear protective gloves, safety glasses, and suitable protective clothing. Protect the material from moisture and keep the container tightly closed. Refer to the Safety Data Sheet, product specification, and lot-specific documentation for complete handling, storage, disposal, and quality information.
