Chemotype Testing Protocols

Chemotype testing protocols are standardized laboratory procedures used to identify and quantify the chemical composition of cannabis samples, particularly cannabinoid and terpene profiles. These protocols employ chromatography-based methods—most commonly HPLC (High-Performance Liquid Chromatography) and GC-MS (Gas Chromatography-Mass Spectrometry)—to measure compounds like THC, CBD, CBG, and volatile terpenes. Chemotype classification enables breeders and researchers to distinguish between genetically identical plants that express different chemical phenotypes due to environmental factors or epigenetic variation. Standardized testing protocols are essential for strain documentation, seed bank inventory, regulatory compliance, and reproducible breeding records. Variations in extraction methods, calibration standards, and detection sensitivity can affect results across different laborator

Breeders rely on chemotype testing to confirm stable cannabinoid and terpene expression across plant generations and to select for consistent chemical profiles in F2 and backcross lines. Reliable chemotype data enables breeders to map chemical trait inheritance and develop lines with predictable, documented compositions.