Overview
Linalool is a monoterpenoid alcohol widely distributed in nature, particularly in essential oils of lavender, coriander, and citrus fruits. It exists in two enantiomeric forms: (R)-(-)-linalool and (S)-(+)-linalool, each with distinct olfactory properties. The compound has been used for centuries in traditional medicine and perfumery. Industrially, linalool is obtained through fractional distillation of essential oils or synthesized from pinene. Its versatility makes it a fundamental building block in the fragrance and flavor industry, accounting for approximately 20% of all terpene derivatives used in commercial applications.
Physical and Chemical Properties
As a tertiary alcohol, linalool exhibits typical alcohol reactivity while maintaining stability under normal conditions. Its volatility contributes to rapid evaporation when exposed to air, making it valuable for top-note formulations in perfumery. The compound's chiral nature influences both its scent profile and biological activity. Linalool demonstrates moderate polarity, allowing dissolution in both polar and non-polar solvents. Its flash point of 76°C classifies it as a flammable liquid, requiring careful handling. The substance gradually oxidizes when exposed to air, forming linalool oxides that alter its aromatic characteristics.
Main Applications
In perfumery, linalool serves as a key ingredient for creating fresh, floral accords, particularly in lavender and bergamot compositions. The cosmetic industry utilizes its antimicrobial properties in skincare products, while its soothing effects make it popular in aromatherapy formulations. The food industry employs linalool as a flavoring agent (FEMA GRAS 2635) in beverages, candies, and baked goods. Recent research explores its potential as a natural insect repellent and sedative in pharmaceutical applications. Industrial uses include serving as an intermediate in vitamin E synthesis and as a chiral building block for fine chemicals.
Safety and Storage
While generally recognized as safe for most applications, linalool can cause allergic contact dermatitis in sensitive individuals. The IFRA recommends concentration limits for leave-on products (0.1-3.5% depending on application). Proper PPE including gloves and eye protection should be used when handling concentrated forms. For storage, linalool should be kept in tightly sealed amber glass or aluminum containers under nitrogen atmosphere to prevent oxidation. Bulk storage tanks should be grounded to prevent static discharge, and storage areas must comply with Class IB flammable liquid regulations.
B2B Procurement Guide
When sourcing linalool, buyers should specify required enantiomeric purity, as the (R) and (S) forms differ in scent profile and biological activity. Industrial buyers typically purchase in drum (180kg) or ISO tank quantities, with prices fluctuating based on citrus crop yields and petrochemical feedstock costs. Certificates of Analysis should confirm parameters including optical rotation, purity (typically 95-99%), and absence of heavy metals. For compliance with international standards, verify documentation for REACH, FDA 21 CFR 172.515, and EU Flavor Directive compliance. Consider supplier audits for manufacturers producing linalool through sustainable extraction methods.
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