Overview
Cholesterol is a sterol, a type of lipid molecule, and is biosynthesized by all animal cells. It is an essential structural component of animal cell membranes, enabling membrane fluidity and integrity. Cholesterol also serves as a precursor for the synthesis of steroid hormones, bile acids, and vitamin D. In industrial contexts, cholesterol is derived from animal sources (e.g., lanolin from wool) or synthesized for use in pharmaceuticals, food additives, and laboratory research. Its role in human health is dual: while necessary for normal bodily functions, excessive levels can contribute to cardiovascular diseases.
Physical and Chemical Properties
Cholesterol appears as a white or light yellow crystalline powder with a faint odor. It is insoluble in water but dissolves readily in nonpolar organic solvents such as ether, chloroform, and hot ethanol. The compound has a melting point of 148-150°C and decomposes at higher temperatures. Its molecular structure includes a hydroxyl group (-OH) at position 3 of the steroid ring, making it an amphipathic molecule. This property allows cholesterol to interact with both hydrophobic and hydrophilic molecules, critical for its role in cell membranes and lipid transport.
Main Applications
In the pharmaceutical industry, cholesterol is used as an excipient in drug formulations, particularly in liposomes for targeted drug delivery. It is also a raw material for producing steroid hormones like cortisol and estrogen. In food and cosmetics, cholesterol acts as an emulsifier or stabilizer. Research laboratories use it for studying lipid metabolism and membrane biology. Due to its role in health, cholesterol levels are a key diagnostic marker in clinical settings.
Safety and Storage
Cholesterol is generally stable but should be stored in airtight containers away from light, heat, and moisture to prevent degradation. While not highly toxic, prolonged exposure to dust or solutions may cause irritation to the skin, eyes, or respiratory tract. Industrial users should adhere to Good Manufacturing Practices (GMP) when handling cholesterol, especially in food and pharmaceutical applications. Proper labeling and Material Safety Data Sheets (MSDS) must be provided by suppliers.
B2B Procurement Guide
When procuring cholesterol, prioritize suppliers with certifications like ISO, USP, or food-grade compliance. Key specifications include purity (typically ≥95%), absence of heavy metals, and microbiological limits for sensitive applications. Bulk buyers should negotiate pricing based on volume, with prices ranging from $50 to $200 per kg. Consider logistics: cholesterol may require temperature-controlled transportation for long-distance shipments. Always request samples and Certificates of Analysis (CoA) before large-scale purchases.
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