Overview
Citral is a naturally occurring unsaturated aldehyde, comprising two isomers (geranial and neral), which impart the characteristic lemon scent to citrus peels and essential oils like lemongrass. It is a versatile intermediate in organic synthesis and a staple in the fragrance and flavor industries. First isolated in the late 19th century, citral is now primarily produced via steam distillation of plant sources or synthesized from isoprene. Its dual role as a flavoring agent (FEMA GRAS 2303) and fragrance component (IFRA-approved) underscores its commercial significance.
Physical and Chemical Properties
Citral exists as a pale yellow liquid with a boiling point of 229°C and a density of 0.887 g/cm³. Its molecular structure includes conjugated double bonds, making it reactive to oxidation and polymerization under light or heat. Notably, citral is insoluble in water but miscible with alcohols and essential oils. Its photosensitivity necessitates amber glass storage to prevent degradation. The compound’s volatility and low flash point (102°C) classify it as flammable, requiring careful handling.
Main Applications
In the fragrance industry, citral is a key top-note in perfumes and soaps, valued for its fresh citrus aroma. It also serves as a precursor for violet-like ionones and vitamin A synthesis. Flavor formulations leverage citral in beverages, candies, and baked goods (typical use levels: 5–100 ppm). Industrially, it acts as an antimicrobial agent and pheromone in pest control. Emerging research explores its potential in anticancer therapies due to bioactive properties.
Safety and Storage
Citral may cause skin/eye irritation (H315, H319) and allergic reactions in sensitive individuals. Proper PPE (gloves, goggles) is recommended during handling. Storage requires airtight containers in cool (<25°C), dark environments to minimize isomerization. Regulatory compliance includes adherence to IFRA standards for fragrance use and OSHA guidelines for workplace exposure limits (8-hour TWA: 2 ppm). Spills should be contained with inert absorbents and disposed of as hazardous waste.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering GC-MS-certified purity (≥95%) and batch consistency. Bulk pricing often negotiates at 100+ kg orders, with discounts for long-term contracts. Key due diligence includes verifying ISO 9001 certification, solvent residue reports (e.g., methanol), and compliance with REACH/EPA regulations. Sample testing for odor profile and stability under UV light is advisable before large-scale procurement.
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