Limonene Chemistry

Limonene is a monocyclic monoterpene (C₁₀H₁₆) commonly found in cannabis cultivars, often co-occurring with myrcene and pinene in the essential oil fraction. The compound exists as two enantiomers—(R)-limonene and (S)-limonene—which differ in their three-dimensional structure despite identical molecular composition. Cannabis typically produces predominantly (R)-limonene, though ratios vary by genotype and cultivation conditions. Limonene's volatility and sensitivity to heat, light, and oxidation make it a marker of post-harvest handling quality in lineage studies and breeding records. Breeders frequently track limonene prominence as part of terpene profile documentation, particularly in cultivars selected for aroma complexity and chemotype preservation.

Breeders working in trait-stacking programs monitor limonene levels alongside cannabinoid ratios and other terpenes to maintain chemotype consistency across generations. Limonene stability during storage and processing is often assessed when selecting parent lines for commercial cultivation, as its rapid degradation can shift the perceived aroma profile within weeks of harvest.