Extraction Methods of Hops

Historically, hop essential oils were obtained through steam distillation, a process where steam passed through ground hops to evaporate volatile compounds, which were then collected from the condensate. In the mid-20th century, solvent-based extraction became common, utilizing chemicals such as methylene chloride, hexane, methanol, and ethanol to isolate resins and oils. While effective at preserving bittering content, these traditional organic solvent methods were eventually phased out due to concerns over purity and residues.

Modern commercial extraction is dominated by the use of carbon dioxide (CO2) in either liquid or supercritical states. This process typically requires hops to be pelletized to rupture the lupulin glands, allowing the CO2 to penetrate and dissolve the resins and oils. Liquid CO2 extraction, operating at lower temperatures and pressures, is often favored for preserving delicate aromatic profiles, whereas supercritical CO2 extraction—using higher pressures and temperatures above 31°C—offers greater efficiency for extracting bittering alpha acids. Recent advancements include high-pressure supercritical systems reaching 500 bar and specialized two-step CO2 extractions that allow for the precise separation of aromatic essential oils from bittering compounds.

The Hops note, unique for its complex green-herbaceous profile with aromatic and subtle bitter undertones, is primarily utilized in contemporary niche and artisanal perfumery to achieve sophisticated, earthy, and sometimes dark aromatic themes. Its association with brewing adds a distinctive, naturalistic element to fragrances, offering a refreshing and grounded depth that is highly valued as an alternative to more traditional herbal notes.

• < b>Tartan</b> by Sarah Baker Perfumes (2017)
• < b>Steading</b> by Pineward Perfumes (2020)
• < b>Red For Filth</b> by Alaska Thunderfuck (2023)

This note excels at creating a clean, invigorating lift that carries an unexpected layer of complex bitterness, allowing the perfume to bridge volatile fresh top notes with richer, tenacious fougère or woody bases. It provides excellent longevity and is often deployed to evoke rustic, natural themes or an unexpected aromatic twist in modern unisex compositions, appealing to those seeking depth beyond common florals and woods.

• < b>Sova</b> by Slumberhouse (2012)
• < b>Hikari</b> by Pryn Parfum (2017)

While Hops is not a foundational note of classical perfumery like Rose or Frankincense, its increased use in the 21st century highlights a trend towards incorporating natural, slightly earthy, and unique botanical extracts. Fragrances like < b>Single Malt on the Rocks</b> by Nimere Parfums demonstrate Hops’ capacity to blend seamlessly with dark, boozy, and woody accords, utilizing its refined bitterness and aromatic depth to enhance the overall complexity and structure of the scent.

Hops (Humulus lupulus) follow a distinct seasonal cycle tied to the hemisphere in which they are grown, requiring cold winters for dormancy followed by long summer daylight hours for optimal growth. In the Northern Hemisphere, including major producing regions like the United States, Germany, and the United Kingdom, the harvest typically occurs from late August through September. Conversely, in the Southern Hemisphere, such as New Zealand and Australia, the peak harvest season takes place between March and early April. While the primary harvest is a once-a-year event, the plants begin to emerge from dormancy in the spring, with early varieties starting to bloom around the summer solstice and alpha varieties blooming in early July. The precise timing of the harvest is critical, as picking cones at the peak of maturity ensures the ideal balance of alpha-acids, beta-acids, and essential oils necessary for brewing.