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For a long time, the secret to an aromatic beer seemed to lie solely in the amount of hops. Today, science reveals a far more fascinating reality: biotransformation. It is the interaction between hop compounds and yeast that transforms neutral molecules into explosions of tropical fruit.
1. The “Survivables”: The champions of resilience
Not all hop oils are equal. Myrcene, although dominant, is highly volatile and evaporates easily. For long-lasting aroma, the modern brewer relies on Survivable Compounds (Linalool, Geraniol) which withstand Whirlpool heat.
- Candidates for early impact (Whirlpool/Primary DH): Cryo Pop®, Centennial, Ekuanot, Idaho 7 or Citra. These varieties “survive” the process and provide a stable aromatic base.
*Bonus not shown on the chart: Superdelic and Nectaron. - Late use (Secondary DH): Varieties such as Cascade, Azacca or Amarillo are perfect for adding final freshness just before kegging.
2. The revolution of Thiols and Mash Hopping
Thiols are the molecules responsible for guava and passion fruit notes. While some hops naturally contain high levels, a large portion remains “bound” and undetectable.
One technique boosts these precursors right from the start of brewing: Mash Hopping. By adding hops during the mash, you promote the yeast’s ability to release these aromas later. To understand everything, check out our guide: How Mash Hopping unleashes your aromas .
Essential Oils Cheat Sheet
| Geraniol (Rose, Geranium) | Centennial, Chinook, Citra, Mosaic |
| Linalool (Orange, Floral) | Amarillo, Citra, Centennial |
| Thiols (4MMP) (Blackcurrant, Passion fruit) | Simcoe, Mosaic, Citra |
Rolling Beers Team Tips
To maximise thiols, use a yeast known as a “thiol‑releaser” or capable of intense biotransformation (such as certain Kveik or New England strains). Combine this with hops rich in precursors during the Whirlpool for a professional result. A technical question? Our experts are here to help.