Overview
M9 Salt Solution (5×) is a concentrated formulation of essential inorganic salts used as a base component for preparing M9 minimal bacterial growth media. Developed for E. coli cultivation, it contains precise ratios of sodium phosphate, potassium phosphate, ammonium chloride, and sodium chloride. As a 5× concentrate, it requires dilution with sterile water and supplementation with carbon sources (like glucose) and magnesium/calcium solutions before use. This formulation is widely adopted in research laboratories due to its consistent performance and convenience compared to preparing salts individually.
Physical and Chemical Properties
In powder form, M9 salts appear as a white crystalline mixture that dissolves completely in water to form a clear, colorless solution. The 5× concentrate has approximately neutral pH (6.8-7.2) when properly prepared. The solution exhibits good stability when stored refrigerated, though precipitation may occur over time due to salt crystallization. Key components include dibasic and monobasic phosphates (buffering agents), ammonium chloride (nitrogen source), and sodium chloride (osmotic balance). Unlike rich media, M9 provides only minimal essential inorganic ions, forcing bacteria to synthesize most metabolites.
Main Applications
The primary use of 5× M9 Salt Solution is preparing defined minimal media for bacterial cultures, particularly in molecular biology experiments requiring controlled growth conditions. It's essential for protein expression studies, metabolic pathway analysis, and selective plating after genetic transformations. Researchers also employ M9 media for auxotrophic strain cultivation, where specific amino acids or vitamins must be added. The minimal nature of M9 makes it ideal for radioactive labeling experiments, as it allows precise control over nutrient incorporation. Recent applications include synthetic biology projects and microbiome research using engineered bacterial strains.
Safety and Storage
While M9 salts are generally low-hazard, powder form may cause mild respiratory or eye irritation. Prepared solutions should be handled with standard laboratory precautions, including gloves and eye protection when handling concentrates. For long-term storage, keep powder in sealed containers at room temperature with desiccants to prevent moisture absorption. Prepared 5× solutions remain stable for 3-6 months at 2-8°C, though sterilization by filtration is recommended. Avoid repeated freeze-thaw cycles of liquid concentrates, as this may cause salt precipitation and concentration inconsistencies.
B2B Procurement Guide
When sourcing M9 Salt Solution (5×), prioritize suppliers specializing in molecular biology reagents. Key procurement considerations include verifying the absence of DNase/RNase contamination, especially for sensitive applications like RNA work. For bulk purchases (1kg+), request certificates of analysis for batch-to-batch consistency. Consider pre-sterilized liquid formulations for high-throughput labs to save preparation time. Lead times for custom formulations may extend to 2-4 weeks. Many manufacturers offer both research-grade (for general use) and GMP-grade (for regulated applications) options with corresponding price differentials of 20-50%.
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