Solvent Retention

Solvent retention refers to residual solvent compounds that remain in cannabis extracts after processing, rather than a naturally occurring terpene. Common solvents in extraction include butane, propane, ethanol, and hexane. While solvent retention isn't a desirable trait in finished products, understanding extraction chemistry and solvent management is crucial for breeders and processors evaluating cultivar suitability for different extraction methods. Some plant chemotypes with higher lipid or resin density may require different solvent protocols to achieve complete purging. Regulatory limits for residual solvents vary by jurisdiction and reflect safety and quality standards.

Breeders don't select for solvent retention itself, but cultivars with specific resin profiles, densities, and lipid compositions present different extraction challenges. Understanding how a strain's terpene and cannabinoid density affects solvent interaction helps extraction specialists optimize processing parameters and purging protocols.