Allium cepa L. · Family: Amaryllidaceae · Bulb Oleoresin
Onion flavour is made rather than stored — the intact bulb is nearly odourless, and its character forms only when cutting releases enzymes onto sulphur precursors. What survives into an extract is the cooked, savoury end of that chemistry, and we profile it by GC rather than quoting a marker borrowed from fresh onion.
A flavour created at the moment of cutting
Onion oleoresin is the solvent-extracted concentrate of dried Allium cepa bulb, used as a savoury base across soups, sauces, seasonings, processed meat and ready meals wherever onion character is wanted without the weight, water and variability of the fresh or dehydrated bulb.
The chemistry is worth understanding because it explains what the product can and cannot be. An intact onion is nearly odourless. Its flavour is created at the moment of cutting, when cell damage brings the enzyme alliinase into contact with sulphur-containing precursors, generating the volatile compounds responsible for onion's pungency — including the lachrymatory factor that makes eyes water.
Those first-formed compounds are unstable. Through drying, heat and extraction they rearrange into a family of organosulphur compounds — dipropyl disulfide, propyl propenyl disulfide and related sulphides — which carry the deeper, cooked-onion character that savoury manufacturing actually wants. That is what an oleoresin delivers: not raw onion sharpness, but the cooked savoury base note.
We profile those compounds by GC, declare volatile oil per batch, and specify bulb as the part — onion peel extract is a separate product with entirely different chemistry, sold for its quercetin content rather than for flavour.
The sulphur chemistry of extracted onion
A principal organosulphur constituent of extracted onion and a major contributor to the cooked-onion character.
Present alongside it; together these dominate the sulphur profile of an onion oleoresin.
Supporting sulphur constituents contributing depth and completing the characterisation profile.
The first-formed compounds after cutting. Highly unstable and largely rearranged by the time an extract exists — part of the chemistry, not a specification line.
Collectively the aroma, declared per batch as on any aroma-led extract.
Onion peel is a distinct material rich in quercetin, sold as a nutraceutical rather than a flavour ingredient. Quoted separately.
Why formulators specify a profiled onion oleoresin
The compounds actually present in an extract, profiled rather than described with markers borrowed from fresh onion.
Onion peel extract is a quercetin product for nutraceutical use, not a flavour ingredient. The part declaration keeps them apart.
The aroma fraction reported per batch, as on any aroma-led extract.
A specified profile removes the batch drift that makes dehydrated onion hard to formulate around.
Solvent named and tested every batch — the defining control on any solvent-extracted product.
India is among the world's largest onion producers, giving depth of raw material and price stability.
These are functional and physico-chemical properties of the actives; SV Botanica does not make medical or therapeutic claims for this ingredient.
Profile grades and dispersible forms
| Grade | Standardisation | Form | Best For | Solubility |
|---|---|---|---|---|
| Onion Oleoresin (Standard) Standard | Sulphur profile by GC; volatile oil declared | Amber to dark brown viscous liquid | Soups, sauces, seasoning, ready meals | Oil-soluble |
| Onion Oleoresin (High Volatile) Aroma-led | Elevated volatile oil; profile declared | Amber viscous liquid | Flavour-critical applications, low inclusion | Oil-soluble |
| Onion Oleoresin Dispersible Dispersible | Plated or emulsified; profile declared | Free-flowing powder | Dry seasoning blends, snack dusting | Dispersible |
| Onion Essential Oil Quoted separately | Distilled volatile fraction only | Amber mobile liquid | Flavour and speciality applications | Oil-soluble |
| Onion Peel Extract Quoted separately | Quercetin product — not a flavour ingredient | Yellow-brown powder | Nutraceutical formulations | Partially water-soluble |
Onion bulb and onion peel are different products with different buyers. The bulb oleoresin here is a flavour ingredient, profiled on organosulphur compounds. Onion peel extract is a nutraceutical ingredient standardised on quercetin, which concentrates in the dry outer skin rather than the flesh — it carries little useful onion flavour and is bought for entirely different reasons. Quoting one against the other confuses two unrelated purchases, and the part declaration on our certificates keeps them distinct. Where a grade is standardised with a carrier, the carrier and inclusion level are named.
Full product specification for Onion Oleoresin, standard grade. Values are specification limits, not batch results; a batch-specific CoA is issued per shipment.
| Parameter | Specification / Limit | Method |
|---|---|---|
| Botanical Source | Allium cepa L. | — |
| Plant Family | Amaryllidaceae | — |
| Part Used | Dried bulb | — |
| Country of Origin | India | — |
| Appearance | Viscous liquid | Organoleptic |
| Colour | Amber to dark brown* | Organoleptic |
| Odour & Taste | Characteristic of cooked onion, savoury and sulphurous | Organoleptic |
| Organosulphur Profile | Dipropyl disulfide and related — declared per batch | By GC / GC-MS |
| Volatile Oil (% v/w) | Declared per batch | Distillation |
| Part Used | Bulb only — peel excluded | Declaration |
| Solubility | Oil-soluble; dispersible grade available | — |
| Carrier / Diluent | Declared with inclusion level (standardised grades) | Declaration |
| Moisture (% w/w) | NMT 1.0 | Karl Fischer |
| Residual Solvent | Solvent named; within permitted limits — every batch | By GC |
| Lead (ppm) | NMT 1.0 | ICP-MS |
| Arsenic (ppm) | NMT 1.0 | ICP-MS |
| Cadmium (ppm) | NMT 0.3 | ICP-MS |
| Mercury (ppm) | NMT 0.1 | ICP-MS |
| Pesticide Residues | Complies (EU MRL, on request) | GC-MS / LC-MS/MS |
| Ethylene Oxide (ETO) | Not treated — declaration provided | LC-MS/MS (on request) |
| Aflatoxins B1 / Total (ppb) | NMT 2 / NMT 4 | HPLC-FLD |
| Ochratoxin A (ppb) | NMT 10 | HPLC-FLD |
| Total Plate Count (cfu/g) | NMT 10,000 | USP <2021> |
| Yeast & Moulds (cfu/g) | NMT 100 | USP <2021> |
| Escherichia coli | Absent | USP <2022> |
| Salmonella sp. | Absent | USP <2022> |
| HS Code | 3301.90 | — |
| Kosher / Halal | Certified (on request) | Certification |
| Shelf Life | 24 months from date of manufacture, in original packed condition | — |
| Storage | Cool, dark place below 25°C, tightly closed, protected from light | — |
*Colour varies with grade and concentration. Two points about this specification are worth understanding. First, the profile describes cooked onion chemistry rather than fresh. An intact onion is nearly odourless; its flavour forms only when cutting releases enzymes onto sulphur precursors, and those first-formed compounds are unstable, rearranging through drying and extraction into the organosulphur family reported here. An oleoresin therefore delivers a deep savoury base note rather than raw onion sharpness — which is what most savoury applications want, but it is worth knowing before a tasting panel expects otherwise. Second, the part declaration: onion peel extract is a different product entirely, standardised on quercetin for nutraceutical use, since quercetin concentrates in the dry outer skin rather than the flesh. It carries little flavour value and is quoted separately. Residual solvent is named and tested by GC every batch.
From bulb to declared oleoresin — profiled, part-controlled, documented
Raw Material: Produced from dried Allium cepa bulb sourced from Indian growing regions. India is among the world's largest onion producers. Drying practice materially affects the sulphur profile of the finished extract — the enzymatic chemistry continues during processing — so incoming material is assessed rather than accepted on appearance.
Extraction & Testing: Produced at certified facilities in India. Each batch is profiled by GC for organosulphur compounds and assayed for volatile oil by distillation. Residual solvent is tested by GC against the named solvent. Contaminant testing covers moisture, heavy metals by ICP-MS, aflatoxins, pesticide residue screening and a full microbiological panel.
Documentation: Every shipment ships against a batch-specific Certificate of Analysis stating the marker assay, volatile oil where applicable, the solvent used and its residual level, and carrier with inclusion level where applicable, together with an MSDS. Halal, Kosher and Organic certification are available — see our guides on EU pesticide MRL compliance and EU import requirements.
What backs every batch of Onion Oleoresin oleoresin
Key information for global product registration and labelling
The distinction most worth stating on this ingredient, because both are legitimately called onion extract and they serve unrelated markets. Onion bulb oleoresin is a flavour ingredient, profiled on organosulphur compounds and bought by savoury manufacturers. Onion peel extract is a nutraceutical ingredient standardised on quercetin, which concentrates in the dry outer skin rather than the flesh; it carries little useful flavour and is bought by supplement formulators. Neither substitutes for the other, and a specification naming only "onion extract" has not distinguished them — a live risk given the price and application gap. We declare the part on every certificate and quote peel extract separately.
Every oleoresin is a solvent-extracted product, which makes residual solvent its defining quality control rather than an afterthought. Permitted extraction solvents and their maximum residues are set by the destination market's rules and differ by solvent class. We name the solvent used on every certificate and test each batch by GC. Buyers should confirm the solvent is permitted for their market and application — a supplier who will not name it has made that check impossible. Where a specific solvent system is required, it can be specified at order.
Supplied from India by SV Botanica — FSSAI Central Licence holder, Spices Board and APEDA registered exporter. Raw material is sourced from Indian onion growing regions. Shipped against a batch-specific Certificate of Analysis with export documentation available on request. This product is supplied as a food ingredient and is not intended to diagnose, treat, cure or prevent any disease.
Guides on onion sourcing, extraction and specification
Two products, two markets — flavour chemistry against quercetin content.
Buyer's GuideHow the onion extracts differ and what each specification should carry.
TechnicalRelevant where a buyer is comparing bulb and peel material on the wrong basis.
RegulatoryResidue limits and screening for India-origin ingredients.
RegulatoryDocumentation, controls and border expectations for Indian botanicals.
Other savoury oleoresins from our range
Technical and commercial questions answered by our ingredients team
Bulb-derived oleoresin with the organosulphur profile by GC, volatile oil and residual solvent declared per batch. Samples for qualified buyers.
Supplied as a bulk ingredient for further manufacture. Buyers are responsible for compliance with the regulations of their destination market. This product is not intended to diagnose, treat, cure or prevent any disease.
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