Isoquinoline

Isoquinoline (CAS 119-65-3), also known commercially as leucoline, is a bicyclic nitrogen-containing aromatic compound sourced primarily from coal tar fractions. Assigned FEMA 2978, it functions as a flavoring agent and fragrance intermediate. In flavor formulation, this compound contributes characteristic coal tar and quinoline-like nuances used at trace levels in complex flavor systems. It is particularly effective in targeting savory and roasted profiles for food products.

Fragrance manufacturers use it as a building block for synthesizing more complex aroma compounds, particularly in oriental and tobacco-type compositions. It provides a unique structural base for high-end perfumery applications. In personal care, it is evaluated for preservation-enhancing properties within multi-functional formulations where antimicrobial support is needed. This dual-purpose functionality makes it a versatile choice for cosmetic chemists.

Food-grade applications are governed by FEMA status, positioning it for use in approved flavoring contexts. Documentation of permitted use is a standard procurement requirement for industrial food manufacturing and safety compliance. The product is supplied as a liquid or low-melting solid, depending on ambient temperature and purity level. Standard commercial grades are available at purities ranging from technical to high-purity levels of 98% or higher.

High-purity grades are specifically required for flavor and fragrance end uses to ensure consistent sensory profiles. Packaging typically ranges from small laboratory quantities up to drum-scale volumes for industrial buyers.