Overview
Ergosterol is a sterol exclusively found in fungal cell membranes, analogous to cholesterol in animal cells. It plays a critical role in maintaining membrane fluidity and permeability. Industrially, it is valued as a precursor for vitamin D2 (ergocalciferol) through UV irradiation, a process leveraged in food fortification and supplement production. Its unique structure also makes it a biomarker for fungal contamination in agriculture and food safety testing. First isolated in 1889 from ergot fungi, ergosterol's commercial significance grew with the discovery of its vitamin D2 conversion. Today, it is sourced from yeast (e.g., Saccharomyces cerevisiae) or mold cultures, with purification processes ensuring high purity for pharmaceutical applications.
Physical and Chemical Properties
Ergosterol crystallizes as a white to pale yellow powder with a melting point of 160-163°C. It is hydrophobic, dissolving readily in organic solvents like ethanol and chloroform but insoluble in water. The compound is photosensitive, undergoing a ring-opening reaction under UV light to form vitamin D2—a property exploited in industrial synthesis. Its molecular structure features conjugated double bonds at positions 5,7, and 22, contributing to its UV absorption at 282 nm, a trait used for analytical quantification. Stability is compromised by prolonged exposure to light, heat, or oxidizing agents, necessitating controlled storage conditions.
Main Applications
In pharmaceuticals, ergosterol is the primary raw material for synthesizing vitamin D2, prescribed to treat deficiencies and metabolic bone disorders. It is also used in antifungal drug research, targeting fungal-specific sterol biosynthesis pathways. The food industry employs UV-irradiated ergosterol to fortify products like milk and cereals with vitamin D2. Additionally, its presence serves as an indicator of fungal contamination in grains and feed, with testing kits utilizing ergosterol quantification for quality control.
Safety and Storage
Ergosterol poses low acute toxicity but requires careful handling to avoid respiratory or dermal irritation. PPE (gloves, goggles) is recommended during weighing or processing. Storage at 2-8°C in amber glass containers minimizes degradation from light and humidity. Regulatory compliance varies by application: pharmaceutical-grade ergosterol must meet USP/EP standards, while food-grade material adheres to FDA or EFSA guidelines. Disposal should follow local hazardous waste protocols due to its organic solvent solubility.
B2B Procurement Guide
Buyers should prioritize suppliers offering HPLC-certified purity (≥95%) and detailed COAs (Certificates of Analysis). Batch-to-batch consistency is critical for industrial-scale vitamin D2 production. Pricing fluctuates with yeast fermentation costs; bulk purchases (1 kg+) typically reduce unit costs by 10-20%. For research use, smaller quantities (1-100g) are available from specialty chemical distributors. Evaluate supplier track records in fungal-derived products and request stability data for long-term storage needs.
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