Overview
DOTMA Chloride is a synthetic cationic lipid first developed for gene transfection applications. Its unique structure enables efficient binding with nucleic acids (e.g., DNA, RNA) to form lipoplexes, which protect genetic material and facilitate cellular uptake. As a research-grade chemical, it's primarily used in biotechnology and pharmaceutical development. The compound gained prominence as a component of Lipofectin, one of the first commercial transfection reagents. Its reliability in vitro has made it a benchmark for developing next-generation delivery systems, though it's gradually being supplemented by newer lipids with improved safety profiles for clinical applications.
Physical and Chemical Properties
DOTMA Chloride features a quaternary ammonium head group linked to two oleoyl chains, giving it amphiphilic properties. The chloride counterion ensures solubility in organic solvents, while the lipid's positive charge facilitates electrostatic interactions with negatively charged biomolecules. Thermogravimetric analysis shows decomposition above 200°C. The compound exhibits lyotropic liquid crystalline behavior in aqueous environments, forming multilamellar vesicles. Its phase transition temperature (~35°C) is crucial for liposome preparation protocols, requiring temperature control during formulation.
Main Applications
In research settings, DOTMA Chloride is principally used to transfect eukaryotic cells with plasmid DNA, siRNA, or mRNA. It's particularly valuable for hard-to-transfect cell lines and primary cells. The pharmaceutical industry employs it in preclinical studies for gene therapy vector development. Recent applications include mRNA vaccine research, where its ability to complex with nucleic acids aids in studying delivery mechanisms. Some advanced formulations combine DOTMA with helper lipids (e.g., DOPE) to enhance endosomal escape and transfection efficiency in specific cell types.
Safety and Storage
As a cationic lipid, DOTMA Chloride can disrupt cell membranes and cause irritation. Laboratories should implement standard procedures for handling hazardous powders: use nitrile gloves, safety goggles, and particulate respirators when weighing. Emergency eyewash stations must be accessible. For long-term stability, store sealed vials under argon or nitrogen atmosphere at -20°C. Desiccant packs should accompany samples to prevent hydrolysis. Opened vials are best used within 6 months when properly resealed. Discard discolored samples, as oxidation degrades performance.
B2B Procurement Guide
Research buyers should prioritize suppliers specializing in molecular biology reagents. Key procurement considerations include: batch-specific certificates of analysis (especially for critical parameters like purity, residual solvents, and endotoxin levels <0.1 EU/mg), compliance with ISO 13485 for diagnostic applications, and availability of technical support. Bulk purchases (100g+) may qualify for 15-30% discounts but require validation of cold chain logistics. Some manufacturers offer custom formulations blended with cholesterol or other lipids. For GMP-grade material expected for clinical trials, expect lead times of 8-12 weeks and 3-5x higher costs compared to research-grade product.
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