Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Western honey bee queens (*Apis mellifera*) produce a blend of mandibular-gland compounds, not one single “queen chemical.” A prominent component is 9-oxo-2-decenoic acid (9-ODA), which the bee makes through a fatty-acid pathway that includes 9-hydroxy-2-decenoic acid (9-HDA). The blend is one part of a wider chemical signaling system involving other glands and signals.
What compounds does a queen bee produce?
The queen mandibular pheromone (QMP) is a multicomponent chemical blend. Commonly listed components include:
- (E)-9-oxo-2-decenoic acid (9-ODA)
- Both enantiomers of (E)-9-hydroxy-2-decenoic acid (9-HDA)
- Methyl p-hydroxybenzoate (HOB)
- 4-hydroxy-3-methoxyphenylethanol (HVA)
- 10-hydroxy-2-decenoic acid (10-HDA)
- 10-hydroxydecanoic acid (10-HDAA)
Lists and component counts differ because authors do not always use “QMP” in the same way: some mean the classic five-component blend, while others count additional compounds or describe a broader queen retinue signal. The queen also produces chemical signals in glands beyond the mandibles, so QMP is not a complete inventory of queen signaling.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →How does a queen bee make pheromones?
The best-described fatty-acid route begins with stearic acid (octadecanoic acid). In the proposed caste-specific pathway for A. mellifera, the molecule is hydroxylated at either its terminal (ω) or next-to-terminal (ω−1) carbon. Subsequent β-oxidation shortens the chain, and further oxidation produces compounds associated with queen or worker gland profiles.
#1 Best Overall
- Start with stearic acid. It is the C18 fatty-acid starting material described for this pathway.
- Hydroxylate at ω or ω−1. The two branches form different intermediates and are associated with caste-biased products.
- Shorten the chain through β-oxidation. The hydroxylated intermediates are processed into shorter fatty acids.
- Oxidize the products. In the queen-associated ω−1 branch, this leads to 9-HDA, which is then converted to 9-ODA.
Alcohol dehydrogenase (ADH) catalyzes the described conversion of 9-HDA to 9-ODA. This is a useful outline of the pathway, not a claim that every enzyme or regulatory step is fully established.
How do queen and worker mandibular compounds differ?
In the described A. mellifera profiles, queens are associated with more 9-ODA, 9-HDA, HOB, and HVA, while workers typically have a profile richer in 10-HDA and its precursor 10-HDAA. These are relative profile differences, not a rule that every individual has an identical chemical composition. Caste, social setting, and reproductive context can affect the observed chemistry.
One specific example illustrates why context matters: field-collected parasitic workers of the subspecies A. m. capensis in queenless host colonies had 9-ODA at 66.18 ± 1.64% of mandibular-gland fatty-acid content, compared with 8.08 ± 2.26% in workers from queenright colonies. The queenless workers also had about five times as many ADH transcripts. Those measurements apply to that subspecies and field comparison; they should not be generalized to ordinary queens or all honey bee colonies.
Recommended Free Tools
What does 9-ODA do, and is it the whole queen signal?
9-ODA is a prominent queen-associated compound. A 2016 PLOS ONE article reported it as 80% of total mandibular-gland secretions in mated queens, but that paper’s estimate is not a universal percentage; it also noted that the full composition of queen-produced compounds had not been completely characterized.
QMP is associated with attracting worker retinues and influencing colony organization. Reported effects include suppression of worker ovary activation, inhibition of queen rearing, and changes in workers’ behavioral maturation. These effects belong to a broader pheromonal system: the queen’s other glands and signals, as well as brood signals, also contribute to colony responses.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What remains uncertain about queen pheromone biosynthesis?
The pathway from stearic acid through caste-biased hydroxylation and chain shortening provides a mechanistic account of several mandibular compounds, especially the 9-HDA-to-9-ODA branch. However, the detailed 10-HDA biosynthetic pathway still requires further research, and the regulation of the pathway should not be treated as fully resolved. Composition and biosynthesis also vary with caste and social conditions, so a single profile should not be presented as universal for all honey bees.
Rank #4
Here, “synthesised” means made biologically by the bee. This account concerns the western honey bee, Apis mellifera; it does not establish that the same pathway or profile applies to every honey bee species.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
