KAPN FIELD GUIDE / AROMA & FLAVOUR
Humulene
Humulene, also called α-humulene or α-caryophyllene, is an open-ring sesquiterpene distinct from β-caryophyllene.
Where it occurs naturally
Humulene occurs in hop essential oil. A GC-MS analysis of Panax ginseng root essential oil also identified α-humulene; that finding supports ginseng root as a source, not every ginseng preparation. Sources: Humulus lupulus – a story that begs to be told: A review; Inhibitory Effects of Essential Oil Extracts From Panax ginseng
Aroma & flavour
Hop aroma arises from a mixture of volatiles. A review identifies woody, green, hoppy and spicy odorants among sesquiterpene oxidation and hydrolysis products; a standalone aroma descriptor for humulene is not established. Sources: The multisensory perception of hop essential oil: a review
What has research actually studied?
In an ovalbumin-driven allergic-airway model in mice, isolated α-humulene reduced eosinophil recruitment to lung fluid and lowered several inflammatory mediators. In a separate receptor-binding assay, α-humulene did not displace a CB2 radioligand at concentrations up to 20 μM. Sources: Preventive and therapeutic anti-inflammatory properties of the sesquiterpene α-humulene in experimental airways allergic inflammation; Beta-caryophyllene is a dietary cannabinoid
What the evidence does not show
The airway result is preclinical and concerns isolated α-humulene, not cannabis. The CB2 result is a binding assay; it found no detectable binding at the tested concentrations. No direct human cannabis-product effect evidence was identified.
What does its presence in cannabis mean?
A label reporting humulene identifies a compound; its presence alone does not establish a cannabis product’s aroma or effects.