Overview
2×CTAB Extraction Buffer is a fundamental reagent in plant molecular biology, designed to isolate high-quality DNA from tough plant tissues. Its primary active ingredient, cetyltrimethylammonium bromide (CTAB), disrupts cell membranes and forms complexes with nucleic acids, protecting them from degradation. The '2×' concentration indicates it is typically diluted to 1× before use. This buffer is particularly valued for handling samples rich in polysaccharides, polyphenols, or other secondary metabolites, which often interfere with standard DNA extraction methods. It is a staple in research labs, agricultural biotechnology, and phylogenetics studies where plant DNA integrity is critical.
Physical and Chemical Properties
The buffer appears as a clear or slightly opaque liquid, depending on additives like polyvinylpyrrolidone (PVP) or β-mercaptoethanol. Its density is slightly higher than water due to dissolved salts and detergents. The solution is stable at room temperature but may precipitate if stored cold; gentle warming and mixing restore homogeneity. Key functional components include CTAB (2-4%), Tris-HCl (pH 8.0), EDTA (chelating agent), and NaCl. Optional additives like β-mercaptoethanol reduce oxidative damage, while PVP binds polyphenols. The buffer works optimally at 60-65°C during extraction, facilitating cell lysis and protein denaturation.
Main Applications
This buffer is indispensable for extracting genomic DNA from plants with challenging chemistries, such as conifers, medicinal herbs, or crops like cotton and potato. It is the gold standard for protocols requiring high-molecular-weight DNA for Southern blotting or genome sequencing. Beyond research, it supports commercial applications in crop genetic testing, GMO detection, and forensic botany. Some labs adapt it for fungal or bacterial DNA extraction when standard kits fail. Its versatility also extends to ancient or degraded plant specimens, where inhibitor removal is crucial for downstream PCR success.
Safety and Storage
While not highly hazardous, CTAB can cause skin/eye irritation, and β-mercaptoethanol (if present) has a strong odor and toxicity. Always use in a fume hood with PPE. Spills should be contained with absorbent materials and cleaned with copious water. Storage at room temperature is typical, but extended shelf life (1-2 years) is achieved at 4°C. Avoid freezing, as CTAB may precipitate. Pre-mixed buffers with β-mercaptoethanol degrade faster; aliquot these to minimize oxidation. Label containers clearly with preparation dates and hazardous components.
B2B Procurement Guide
When sourcing 2×CTAB buffer, confirm whether the supplier provides pre-made solutions or dry mixes. Pre-made buffers offer convenience but incur higher shipping costs for cold-chain items. Dry mixes are cost-effective for large-scale users but require lab preparation. Key procurement considerations include: batch consistency (critical for reproducible extractions), customization options (e.g., omitting β-mercaptoethanol for safety-sensitive environments), and compatibility with automated extraction systems. Bulk orders (5+ liters) typically reduce costs by 20-30%. Always request SDS and quality control data, especially for regulated applications like diagnostics.
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