Overview
25-Hydroxycholecalciferol (25-OH-D3) is a metabolite of vitamin D3, synthesized in the liver through hydroxylation. It is a critical intermediate in the vitamin D metabolic pathway, serving as the primary circulating form of vitamin D in the bloodstream. This compound is measured clinically to evaluate vitamin D status, as it has a longer half-life than its active counterpart, calcitriol. In both human and veterinary medicine, 25-hydroxycholecalciferol is widely recognized for its role in maintaining calcium and phosphorus balance. Its stability and ease of measurement make it a preferred biomarker for assessing nutritional adequacy and diagnosing deficiencies.
Physical and Chemical Properties
25-Hydroxycholecalciferol is a crystalline solid with limited solubility in water but good solubility in organic solvents like ethanol and dimethyl sulfoxide (DMSO). Its molecular structure includes a hydroxyl group at the 25th carbon position, which enhances its polarity compared to vitamin D3. The compound is sensitive to light, heat, and oxidation, requiring careful handling and storage. Analytical methods such as high-performance liquid chromatography (HPLC) are commonly used to determine its purity and concentration in formulations.
Main Applications
The primary application of 25-hydroxycholecalciferol is in medical diagnostics, where it is used to measure vitamin D levels in serum. This helps diagnose deficiencies or excesses, guiding treatment plans for conditions like rickets or osteoporosis. In the nutraceutical industry, it is incorporated into dietary supplements to support bone health and immune function. Additionally, it is added to animal feed to prevent vitamin D deficiency in livestock, improving growth rates and bone strength.
Safety and Storage
25-Hydroxycholecalciferol should be handled in a controlled environment to prevent degradation. Protective equipment, including gloves and goggles, is recommended to avoid skin contact or inhalation of dust. Storage at -20°C in airtight, light-resistant containers is essential to maintain stability. Long-term exposure to higher temperatures or humidity can lead to decomposition, reducing efficacy.
B2B Procurement Guide
When procuring 25-hydroxycholecalciferol, prioritize suppliers who provide detailed certificates of analysis (COA) verifying purity (typically ≥98%). Bulk buyers should inquire about batch-to-batch consistency and stability data. Consider packaging options that ensure product integrity during transit, such as vacuum-sealed bags with desiccants. For international shipments, confirm compliance with regulatory standards (e.g., USP, EP) to avoid customs issues.
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