Turmeric Oleoresin (Curcumin)

Origin & story

The source plant is Curcuma longa, a rhizome-forming member of the ginger family, and India is the dominant producer of the world's turmeric. The commercial belt is mostly plains and plateau rather than hill country — Erode and the Tamil Nadu belt, Telangana and Andhra Pradesh, and Sangli in Maharashtra — with high-curcumin "Alleppey" types associated with Kerala. The Western Ghats link is specific: ICAR's Indian Institute of Spices Research at Kozhikode, in the Kerala Ghats, is a national turmeric research base, and turmeric is grown in Kerala's foothills, though the bulk tonnage comes from the Deccan and the southern plains.

How it’s made

Cured, dried rhizome is milled to powder and washed with a food-grade solvent — commonly acetone, ethanol, ethylene dichloride, hexane, isopropanol or ethyl acetate — that pulls out the colour and resinous matter. The solvent is then stripped off under vacuum, leaving the oleoresin: a viscous extract carrying the concentrated curcuminoids and volatile oils. To reach standardised curcumin (the purified grade, colour additive E100), the oleoresin is given further selective washes and crystallisation. CSIR-CFTRI has reported a turmeric processing route intended to shorten drying and improve curcumin and volatile-oil recovery.

Sourcing & cultivation

Turmeric is a long-duration tropical crop, roughly seven to nine months in the ground, planted with the onset of the monsoon around June on well-drained loamy soils and harvested from January onwards. After harvest the rhizomes are cured within a couple of days: they are boiled in water until soft, then sun-dried and polished before sale or extraction — this curing is what fixes the colour and keeps the lot sound. Curcumin content is driven by variety and locality, with Alleppey-type material prized for high curcumin, so growers aiming at the oleoresin market should match variety (IISR releases such as Prabha, Pratibha and Suguna are common choices) to buyer specs.

Grades & quality

Curcumin content is the master spec — international assessments (JECFA, IACM) put turmeric oleoresin at roughly 5-55% curcuminoids, while the purified "curcumin" grade must be at least 90% curcuminoids and carries the E100 colour designation. In practice that spans standard food-colour oleoresin at the lower end up to high-curcumin standardised extracts. Buyers also check declared colour value (curcumin %), volatile-oil content where flavour matters, the extraction solvent used and residual-solvent limits. JECFA has set an ADI for curcumin of 0-3 mg/kg body weight.

Uses & applications

The dominant use is as a natural yellow colour (E100) in dairy, confectionery, baked goods, sauces, pickles, mustard, seasonings, cheese and beverages, where it is valued as a plant-derived alternative to synthetic yellows. It also carries turmeric flavour into savoury and snack seasonings. Beyond food, curcumin-rich extract feeds cosmetics, natural dyeing and the dietary-supplement/nutraceutical trade; described factually, it is a colour and flavour ingredient, not a medicine.

For buyers & the trade

India is a leading global supplier of turmeric and its extracts. When sourcing, pin down the numbers that actually price the lot: curcumin/colour value, volatile-oil content if flavour is needed, the food-grade solvent used and residual-solvent compliance. High-curcumin origins command a premium over standard food-colour oleoresin, so specify grade rather than ordering generic "oleoresin," and confirm the exporter can document solvent and residue limits for your destination market.

Frequently asked