Overview
16-Hexadecanolide is a 16-membered macrocyclic lactone primarily valued for its musky odor profile. As a fragrance compound, it belongs to the class of white musks and is structurally related to natural musk compounds found in animal secretions. The compound is synthesized through cyclization of 16-hydroxyhexadecanoic acid or via ring-closing metathesis. In industrial applications, 16-Hexadecanolide serves as a cost-effective alternative to natural musk derivatives. Its stability in various pH conditions and compatibility with other fragrance ingredients make it particularly useful in cosmetic formulations. The compound has been commercially available since the mid-20th century as part of the synthetic musk family.
Physical and Chemical Properties
16-Hexadecanolide exhibits typical lactone characteristics with a melting point range of 32-34°C and low volatility. Its vapor pressure is approximately 0.001 mmHg at 25°C, contributing to its longevity as a fragrance component. The compound demonstrates good thermal stability, with decomposition beginning above 250°C. Chemically, 16-Hexadecanolide is resistant to hydrolysis under neutral conditions but may undergo ring-opening in strongly alkaline environments. Its logP value of about 6 indicates high lipophilicity, explaining its preferential solubility in organic solvents and oils over water. The musk odor threshold is remarkably low, typically around 0.1 ppb in air.
Main Applications
The primary use of 16-Hexadecanolide is in fine fragrance compositions, where it functions as a base note with excellent fixative properties. It accounts for approximately 5-15% of musk ingredients in modern perfumery, often blended with galaxolide or ethylene brassylate. In functional fragrances, it finds application in laundry detergents and fabric softeners due to its substantivity on textiles. Beyond perfumery, 16-Hexadecanolide serves as a flavor modifier in food products, particularly dairy and meat analogues. The cosmetic industry utilizes it in creams and lotions at concentrations up to 0.5%. Recent developments explore its potential as a pheromone analog in agricultural pest control systems.
Safety and Storage
16-Hexadecanolide has low acute toxicity (LD50 >2000 mg/kg oral, rat) but requires proper handling due to potential skin sensitization in concentrated form. The compound is not classified as hazardous under GHS, though dust exposure should be minimized. Appropriate PPE including nitrile gloves and safety glasses is recommended for bulk handling. Storage should be in tightly sealed containers under nitrogen atmosphere to prevent oxidation. Ideal storage temperature ranges from 15-25°C with relative humidity below 65%. The shelf life typically exceeds 24 months when stored properly. Compatibility testing is advised when combining with strong oxidizers or alkaline substances.
B2B Procurement Guide
Commercial quantities of 16-Hexadecanolide are typically available in 25kg fiber drums or 200kg steel containers. Key procurement considerations include verification of organoleptic purity through sensory evaluation and confirmation of heavy metal content below 10 ppm. Reputable suppliers should provide certificates of analysis including GC purity (minimum 98%), residual solvent content, and optical rotation data. Bulk pricing often becomes competitive at order quantities above 500kg, with potential discounts of 10-15%. Just-in-time delivery is preferable to long-term storage. For international shipments, ensure proper HS code classification (2915.39.00 for most countries) and compliance with IFRA usage guidelines. Sample testing for specific application performance is strongly recommended before large purchases.
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