Polyphenol Oxidation

Polyphenol oxidation refers to enzymatic browning processes that occur when plant tissue is damaged or exposed to oxygen, common during cannabis curing and fermentation. This biochemical reaction converts colorless polyphenol compounds into brown melanin-like pigments, affecting both visual appearance and aromatic profile. The process is temperature and humidity-dependent, making it relevant to post-harvest handling rather than fresh flower chemistry. Breeders and cultivators monitor oxidation rates as part of quality control, since uncontrolled oxidation can degrade cannabinoid and terpene stability. Understanding polyphenol oxidation helps explain color shifts and aroma changes during cure cycles.

Breeders rarely select directly for polyphenol oxidation, but they do work with cultivars exhibiting different enzymatic activity rates and cell-wall structure that influence how quickly oxidation occurs post-harvest. Strains with denser trichome heads or thicker leaf material may show different oxidation kinetics during cure, making this trait relevant to breeding for shelf-stable flower.