Raw honey enzymes: what the heat destroys
Where heat stops being processing and starts being real damage.
Honey is the only food that never spoils. The active reason is enzymatic: glucose oxidase converts glucose to gluconic acid and hydrogen peroxide when diluted, a continuous, self-renewing antimicrobial system. This enzyme is inactivated at 55 °C in 15 minutes.
The line
The line is roughly the temperature of the hive on a warm day. Below it, honey keeps its enzymes, pollen, and aromatics. Above it, you get a clear, pourable, shelf-stable syrup that has lost the very things that made it honey.
Diastase and HMF: the technical markers
The diastase number (DN) is the international quality standard. Fresh raw honey from the hive has DN typically above 15–20. The Codex Alimentarius standard requires a minimum DN of 8. Below that threshold, the honey was heated. HMF (hydroxymethylfurfural) is the marker of heat damage: near zero in fresh raw honey, rising with heat and storage temperature. Codex maximum is 40 mg/kg.
Crystallization
Crystallization at room temperature is a sign of genuine raw honey, not a defect. Heated or ultra-filtered honey stays liquid for years. Supermarkets taught us to fear crystallization: it is actually a signature of the real thing.
Key points
The summary search engines extract.- Glucose oxidase (antimicrobial H₂O₂ generator) inactivated at 55 °C in 15 minutes.
- Diastase number (DN) is the international freshness marker, fresh raw honey DN 15–20+; Codex minimum 8.
- HMF near zero in fresh raw honey, rising with heat; Codex maximum 40 mg/kg.
- Crystallization at room temperature is a sign of genuine raw honey, heated or ultra-filtered honey stays liquid for years.
- The 'raw' label is unregulated in most countries: ask for DN value or source directly from beekeeper.