Sodium chloride
Sodium chloride (NaCl), commonly known as table salt, is an ionic compound composed of sodium and chloride ions. It is widely used in laboratory, pharmaceutical, and industrial applications for maintaining osmotic balance, as a buffer component, and in the preparation of physiological solutions.
What is sodium chloride?
Sodium chloride (NaCl) is a white crystalline solid composed of sodium (Na⁺) and chloride (Cl⁻) ions held together by ionic bonds. It is naturally occurring and is the primary source of dietary sodium. In laboratory and biotechnological settings, it is used to adjust ionic strength in solutions, maintain osmotic balance, and support protein stability during purification and storage.
How is sodium chloride used in laboratory and regulatory contexts?
In biotechnology and pharmaceutical research, sodium chloride is a key component in buffers such as phosphate-buffered saline (PBS) and in the formulation of injectable products. Its purity and quality are strictly regulated under standards such as USP, BP, EP, and ACS. High-purity grades are required for sensitive applications like cell culture, enzyme assays, and chromatography. Regulatory frameworks such as ISO, REACH, and GHS govern its safe handling and disposal, while certificates of analysis (CoA) and safety data sheets (SDS) are essential for compliance in procurement and quality assurance.
What are the safety and regulatory considerations?
Although sodium chloride is generally regarded as safe (GRAS) by the FDA and other regulatory bodies, excessive exposure can lead to health risks such as hypertension. In industrial settings, it is classified under GHS as non-hazardous, but dust formation in dry environments may require respiratory protection. Proper storage and handling are essential to prevent contamination and ensure batch consistency. Compliance with TSCA (US) and REACH (EU) is required for commercial distribution.
Related concepts
Commonly used in buffer preparation, osmotic regulation, and as a reference standard in analytical methods such as HPLC and NMR. It is also a critical ingredient in the production of pharmaceuticals and medical devices.