Browning Reactions

Browning reactions in cannabis refer to oxidative processes that occur during curing, storage, and processing, where plant material darkens through enzymatic and non-enzymatic pathways. These chemical transformations involve the breakdown of chlorophyll, oxidation of phenolic compounds, and Maillard-type reactions between amino acids and reducing sugars. Browning is distinct from terpene degradation, though both occur simultaneously during post-harvest stages. The extent and rate of browning are influenced by temperature, humidity, light exposure, and initial plant chemistry. Understanding browning mechanisms helps breeders and cultivators optimize preservation protocols and predict how cannabinoid and terpene profiles may shift over time.

Breeders working in preservation genetics study plant lineages with slower browning rates and greater chemical stability during storage. Selecting for high antioxidant profiles and stable cell wall structures can influence how cultivars age, making this trait relevant for seed lines intended for long-term seed banking or commercial shelf-life applications.