Calcium Citrate, identified by its CAS number 813-94-5, is a chemical compound that plays a significant role across various scientific and industrial sectors. Typically presented as a fine white powder, its chemical formula C12H10Ca3O14, with a molecular weight of approximately 498.43 g/mol, signifies a complex salt of citric acid and calcium. Understanding its intrinsic properties is fundamental to leveraging its full potential in applications ranging from pharmaceuticals and food science to analytical chemistry.

The physical characteristics of Calcium Citrate are critical for its handling and integration into different matrices. Its appearance as a white powder suggests a high degree of purity and fine particle size, which is advantageous for dissolution and dispersion. While often referred to generically, specific forms like Calcium Citrate Tetrahydrate (CAS 5785-44-4) also exist, with variations in water content affecting molecular weight and solubility. The assay for high-quality Calcium Citrate typically falls within the range of 97.5% to 100.5%, indicating a high concentration of the active compound.

In pharmaceutical applications, Calcium Citrate is valued for its bioavailability as a source of calcium. It is synthesized through reactions involving calcium compounds and citric acid. Manufacturers ensure that the resulting powder meets stringent standards, such as USP35, which dictates acceptable limits for impurities, loss on drying, and heavy metals. This rigorous quality control ensures that the Calcium Citrate sourced by companies is suitable for ingestion and therapeutic use.

For those looking to buy Calcium Citrate powder online, particularly those interested in pharmaceutical grade Calcium Citrate price, it's important to consider the scientific data supporting its efficacy and safety. Research papers often detail the dissolution rates, stability, and interaction profiles of Calcium Citrate in various formulations. A reliable Calcium Citrate supplier in China or globally will be able to provide detailed scientific literature and technical specifications upon request.

The understanding of Calcium Citrate’s properties extends to its role as an analytical reagent. Its defined chemical composition and purity make it a reliable standard for calibration and testing in laboratory settings. When sourcing for these purposes, one might look for specifications like a high assay percentage (e.g., Calcium Citrate assay 97.5% manufacturer) to ensure accuracy in experimental outcomes.

Companies involved in the food industry also utilize Calcium Citrate for its functional properties, such as its role as an acidity regulator or firming agent. Its solubility characteristics, while moderate in water, can be influenced by pH and temperature, factors that are important in food processing and formulation science.

Ultimately, whether for a pharmaceutical API, a food additive, or a laboratory reagent, a deep understanding of Calcium Citrate's scientific underpinnings – its chemical formula, assay, purity, and physical properties – is essential. Partnering with a reputable manufacturer of USP35 standard Calcium Citrate ensures access to this scientifically validated compound, supporting innovation and quality across industries.