How Shea Butter Is Refined: The N-RBD Process
N-RBD stands for Neutralised, Refined, Bleached, Deodorised. Here is what each stage does to shea butter, what it removes, and what it can never fix.
Summary
- N-RBD
- Neutralised · Refined · Bleached · Deodorised
- Removes
- Free fatty acids, pigments, peroxides and odour volatiles, residual soap, part of the unsaponifiables and tocopherols
- Keeps
- Triglyceride composition (fatty-acid profile), saponification value, refractive index, iodine value — the identity values
- Route options
- Chemical (caustic neutralisation) or physical (steam-stripping of FFA in deodorisation)
What N-RBD means and why buyers choose it
Refining standardises shea butter's colour, odour and acidity; it does not change what the fat is made of. N-RBD expands to Neutralised, Refined, Bleached, Deodorised. Food manufacturers, cocoa-butter-equivalent blenders, pharmaceutical excipient buyers and fragrance-sensitive cosmetic brands specify it because they need a white, odourless, low-FFA fat. See N-RBD, refined N-RBD shea butter and shea butter grades.
The trade-off is honest: neutral colour and odour and low FFA and peroxide value, versus a reduced share of the unsaponifiable fraction that unrefined buyers value. Cold-pressed says nothing about FFA — pressing does not remove free acids; only neutralisation or physical steam-stripping does. See free fatty acid.
| Stage | Removes | Leaves in place |
|---|---|---|
| Neutralisation | Free fatty acids (as soapstock) | Triglyceride composition; identity values |
| Bleaching | Pigments, trace metals, primary oxidation products | Fatty-acid profile |
| Deodorisation | Odour volatiles, residual FFA, some tocopherols | SAP, refractive index, iodine value |
| Fractionation (optional) | Nothing — it splits the fat | Each fraction is still shea triglyceride |
- 1
Melt, filter and (where needed) degum
Crude butter is melted and filtered to remove particulates. Degumming with water or acid is used for oils high in phosphatides. Shea is low in phosphatides, so degumming is often minimal or skipped. The step produces a cleaner feed; it does not change FFA or peroxide value.
What changes: cleaner feed; no change to FFA or peroxide value.
- 2
Neutralise free fatty acids with caustic soda
Dilute sodium hydroxide is dosed against the measured FFA plus a small excess. The free acids form soap (soapstock), which is separated by settling or centrifuge. The dose is calculated from FFA per cent and oil mass — the caustic-soda dose calculator is the arithmetic, and free fatty acid is the measurement. See also neutralisation.
The alternative is physical refining, which strips FFA as vapour during deodorisation and is suited to lower-FFA feedstock. High-FFA crude butter is usually chemically neutralised. Either route can be described as N-RBD when the later stages are applied.
What changes: FFA falls to refined levels; some neutral oil is lost with the soapstock.
- 3
Wash and dry
Hot-water washes remove residual soap and caustic. Vacuum drying then removes the water that would otherwise drive hydrolysis and hurt bleaching. Peroxide value is unchanged at this point.
What changes: soap and moisture removed; peroxide value unchanged.
- 4
Bleach with activated earth or carbon
Adsorbent — acid-activated bleaching earth, sometimes with activated carbon — is mixed under vacuum at moderate temperature, then filtered out. It removes carotenoid and chlorophyll pigments, residual soap, trace metals and primary oxidation products. Colour lightens; peroxide value drops because hydroperoxides are adsorbed or decomposed. A small amount of butter is retained in the spent earth.
What changes: colour lightens; peroxide value drops; a little butter stays in the spent earth.
- 5
Deodorise under vacuum with steam
Steam stripping at high temperature and low pressure removes volatile odour compounds, remaining free fatty acids and some tocopherols. Odour becomes neutral; FFA falls further; tocopherol content falls; peroxide value approaches zero. Trans-isomer formation is possible if the temperature is excessive — that is a process-control issue, not a reason to reject deodorisation. See deodorisation.
What changes: odour neutral; FFA further reduced; tocopherols reduced; peroxide value near zero.
- 6
Polish-filter, cool and crystallise
A final filtration removes residual earth. Controlled cooling then sets a stable crystal form and avoids graininess. There is no chemical change. See slip melting point.
What changes: texture set; no chemical change.
- 7
Optional: fractionate into stearin and olein
Controlled crystallisation and separation yield a harder stearin fraction, used in cocoa butter equivalents, and a softer olein. This step is optional and is not required to call the butter N-RBD. See shea butter versus cocoa butter, cocoa butter equivalent, winterisation and refined N-RBD for chocolate and CBE.
What changes: melting profile split; each fraction differs from whole butter.
- 8
Test, release and pack
FFA, peroxide value, colour, moisture, an odour panel and the identity values are checked against the refined specification. A batch COA is issued — see the sample certificate of analysis and how to read a shea butter COA. Pack under conditions that protect the butter from light and air; store it as the storage guide describes.
What changes: nothing — this is the proof.
What refining changes (and what it cannot)
Refining moves FFA, peroxide value, colour and odour; it leaves saponification value, refractive index and iodine value where they were — which is why those three are the adulteration checks. See signs of adulterated shea butter.
| Property | Unrefined (typical) | Refined N-RBD (typical) | Direction | Why |
|---|---|---|---|---|
| Free fatty acid | — | — | ↓ | Neutralisation, then deodorisation |
| Peroxide value | — | — | ↓ | Bleaching adsorbs or decomposes hydroperoxides; deodorisation strips the rest |
| Colour | — | — | Ivory / yellow → white / off-white | Bleaching removes carotenoids |
| Odour | Nutty / smoky | Neutral | → neutral | Deodorisation removes volatiles |
| Unsaponifiable matter | — | — | ↓ modestly | Adsorption and distillation losses |
| Tocopherols | Present in the unsaponifiable fraction | Reduced | ↓ | Lost to the deodoriser distillate |
| Moisture | — | — | ↓ | Vacuum drying |
| Melting point | — | — | ≈ unchanged | Triglyceride composition intact; fractionation (step 7) changes it |
| Saponification value | — | — | Unchanged | Identity value |
| Refractive index | — | — | Unchanged | Identity value |
| Iodine value | — | — | Unchanged | Identity value |
| Fatty-acid profile | Stearic–oleic triglyceride composition | Same composition | Unchanged | Trans-isomers possible only if deodorisation is over-heated |
Typical columns read published specification ranges where they exist; a dash means no published range is stored for that grade. Direction is always shown.
Yields and losses
Every percentage point of FFA in the crude butter costs more than one point of yield in refining. Neutral-oil loss in chemical neutralisation is a multiple of the FFA removed — the refining factor. Bleaching-earth retention and deodoriser distillate add further loss. Low-FFA feedstock therefore refines with less loss; that is the raw-material problem.
How EMI Agro produces refined N-RBD
EMI Agro supplies refined N-RBD shea butter produced to its specification and released against a batch certificate of analysis for the parameters the order names. Route, in-house versus toll refining, bleaching agent and deodorisation band are confirmed on the order. See the sample certificate of analysis, refined N-RBD shea butter and certifications and quality.
Which grade should you buy?
Unrefined Grade A is for formulators who want the full unsaponifiable fraction and the natural colour and odour. Refined N-RBD is for food, pharmaceutical, fragrance-sensitive and colour-critical products. Both are released against a COA. Compare Grade A, B and C on shea butter grades. Product pages: unrefined Grade A shea butter, refined N-RBD shea butter and buyer notes by industry.
Related pages
Shea butter buyer guides
Import, COA, storage and refining procedures.
Complete guide to shea butter
Origin, grades, specifications and sourcing.
Free fatty acid (FFA)
FFA measures hydrolytic breakdown of the fat; it is set by kernel handling before pressing, not by filtration afterwards.
Peroxide value (PV)
Peroxide value is the first oxidation marker; a rising PV on a stored lot is a storage or age problem, not a pressing problem.
Unsaponifiable matter
The unsaponifiable fraction — triterpene alcohols and related minors — is why formulators specify shea rather than a cheaper hard fat.
Colour
Colour is an appearance specification, not a grade: ivory to pale yellow is typical of unrefined shea; white is typical of N-RBD.
Saponification value
Saponification value reflects average fatty-acid chain length; an abnormal SAP is an identity or adulteration signal.
Refractive index
Refractive index is an identity check: a value outside the shea range suggests a different fat or a blend.
Slip melting point
Slip melting point governs skin feel and the fat's behaviour in a chocolate or balm formula.
Caustic Soda Dose Calculator
Free calculator.
Coa Interpreter
Free calculator.
Refined N-RBD shea butter
Product specification and supply notes.
Unrefined Grade A shea butter
Product specification and supply notes.
Buyer playbook
The sourcing playbook that uses this procedure.
How to Import Shea Butter from Nigeria
The export-side procedure: NEPC, Form NXP, NESS inspection, NAFDAC and NAQS certificates, customs and loading at Lagos ports.
How to Read a Shea Butter COA
Every line of a certificate of analysis explained, with the red flag for each of the nine parameters and a buyer checklist.
Frequently asked questions
References & standards
- AOCS — edible oil processing methods and recommended practices — American Oil Chemists' Society (accessed 13 September 2026)
- Honfo, F. G. et al. — Nutritional composition of shea products and transformation technologies: a review — Critical Reviews in Food Science and Nutrition (accessed 13 September 2026)
- Codex Standard for Edible Fats and Oils not Covered by Individual Standards (CXS 19-1981) — Codex Alimentarius (accessed 13 September 2026)
- Scientific Opinion on trans fatty acids (deodorisation and trans-isomer formation) — European Food Safety Authority (accessed 13 September 2026)
- NIS 571:2013 — Shea butter — Specification — Standards Organisation of Nigeria (accessed 13 September 2026)
- ISO 660 — Acid value and acidity (used to dose neutralisation) — International Organization for Standardization (accessed 13 September 2026)
Last reviewed September 2026 by EMI Agro Industries QC team.
Manufacturer-direct from Ibadan, Nigeria
Need refined N-RBD or unrefined Grade A? Choose with the numbers in front of you.
Request a COA for either grade and compare FFA, peroxide value, colour and unsaponifiables side by side.
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