alpha-Sinensal is a low-abundance but high-impact citrus aroma constituent best known from mandarin and orange flavor chemistry. The current evidence base supports its identity, odor character, occurrence in folded and ripe citrus oils, and its role as an important aroma compound in citrus, but there is very little standalone pharmacology or human safety literature specific to the isolated constituent. For AromaForge, alpha-Sinensal is best described as a citrus aldehydic marker with strong flavor-aroma relevance and major research gaps outside sensory chemistry.
Chemical identity and composition
PubChem lists alpha-Sinensal as C15H22O with the all-trans tetraenal structure (2E,6E,9E)-2,6,10-trimethyldodeca-2,6,9,11-tetraenal. Within the archive it appears from modest levels in yellow mandarin ISO-style profiles at 0.2-0.5% up to strongly enriched levels in a green mandarin super-concentrate process model at 10.9%, matching its role as a folded-citrus impact odorant.
Aroma and practical use
- Use the recorded citrus, orange, sweet, fatty descriptors to explore a blend's scent character; perceived strength also depends on the other ingredients.
- Review the flagged use concerns across every contributing oil and the selected dilution.
- Read the route, preparation and experimental context before using a study finding to choose an oil.
Reported benefits and effects
Findings retain their study context. An animal or laboratory result describes that experiment.
citrus biosynthesis context
A Plant Journal paper on citrus flavor and aroma biosynthesis described alpha-Sinensal as one of the low-abundance sesquiterpene compounds that stand out in citrus as important flavor and aroma compounds.
Measured: developmental and biochemical aroma context
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
orange essence occurrence
A 2003 Journal of Chromatography A paper identified alpha-Sinensal in orange essence oil by GC-MS, while showing that beta-Sinensal rather than alpha-Sinensal was among the most intense aroma contributors in that specific sample.
Measured: aroma-active and identified volatile profile
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
Use concerns and concentration limits
Sensitization concernFlagged
Flagged in the constituent reference; assess the source, route and finished-product concentration.
Phototoxicity concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Oxidation concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Penetration enhancementNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
A recorded constituent reference, not a recommended oil dilution. Product category, source applicability and all contributing oils must be checked before use.
unverified reference · No source provenance attachedNo standalone public toxicology review or constituent-specific IFRA-style limit for isolated alpha-Sinensal was verified in the reviewed sources.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
Because alpha-Sinensal is an aldehydic citrus impact compound but lacks robust constituent-specific safety literature in this pass, archive copy should stay descriptive and avoid extrapolating irritation or therapeutic claims beyond the cited sources.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
Constituents it may interact with
These are research candidates recorded in the interaction matrix. They do not add a proven-amplification bonus to the score.
gamma-TerpineneAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
mechanistic · antioxidant
No source citation attached.
Read gamma-Terpinene report →How the effects were investigated
citrus aroma biosynthesis context
A citrus terpene-biosynthesis paper identifies alpha-Sinensal as one of the low-abundance sesquiterpene-derived compounds that stand out in citrus aroma, placing it in a developmental fruit-aroma context rather than a pharmacology mechanism context.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
What this report cannot establish
- A reported constituent percentage does not establish an effective human therapeutic dose or the amount absorbed into the body.
- The presence of a constituent does not guarantee a clinical benefit, rash treatment or sleep improvement from a custom blend.
- An unflagged concern or missing use limit does not establish safety for ingestion, inhalation, skin exposure or a particular person.
- A candidate constituent interaction does not establish that two oils amplify one another at the selected proportions.
- Constituent descriptors alone do not establish a precise top, heart or base lifetime in a finished blend.
Known data gaps (7)
- No human clinical or constituent-specific pharmacology studies for isolated alpha-Sinensal were verified in this pass.
- The located literature is heavily weighted toward flavor chemistry and citrus biosynthesis rather than toxicology or mechanistic bioactivity.
- Aroma-impact evidence is stronger for beta-Sinensal than alpha-Sinensal in the directly read orange essence study, so claims about orange-odor intensity should stay specific to source context.
- 2026-07-13 re-verification (worker c3): a targeted search for IFRA/Tisserand dermal limit and sensitization/phototoxicity data for alpha-sinensal (CAS 17909-77-2) surfaced only flavor-chemistry and CIR citrus-ingredient references with no isolated-compound numeric limit; dermal_limit_verified remains false.
- The numeric dermal reference lacks source provenance; a verified flag alone is insufficient.
- Some findings do not record an explicit exposure route; consult the linked study before applying them to a use.
- Interaction candidates lack an attached source citation and remain unqualified.