Picrorhiza kurroa Extract 4% Picrosides + 8% Bitter Principles

The rhizome of Picrorhiza kurroa, the small alpine perennial of the Himalayan slopes sold in Ayurvedic trade as kutki, is extracted with ethanol to give this Picrorhiza kurroa extract. The concentrate is dried and milled to a light brown, 80 mesh powder with an intensely bitter, earthy character.

Picrosides are measured by HPLC at 4%, and a bitter principles figure of 8% is stated beside it, in a single grade. The slow-growing plant is a wild-harvested herb of the high Himalaya, and the identity statement fixes the species and the rhizome as the material.

SKU: BOT-STX-0207 Category: Standardized Extracts Tags: Dry Blends & Premixes, Ethanol Extracted, Gummies & Chews, Kutki, Root & Rhizome, Standardized Extracts

Picroside Standardization & Grades

Picrosides are iridoid glycosides, and the best-known of them, picroside I and picroside II, are esters of the iridoid catalpol with cinnamic and vanillic acid, respectively. They are the characteristic constituents of the rhizome of Picrorhiza kurroa Royle ex Benth., together with kutkoside, cucurbitacins and phenolic glycosides. A Picrorhiza kurroa extract is standardized to picrosides because they are defined, measurable and typical of the plant, and the bitter principles figure covers the wider bitter fraction that gives kutki its name.

The Picrorhiza kurroa grade is a single level with two numbers, 4% picrosides and 8% bitter principles. The picroside figure is a specific HPLC result, while bitter principles is a group figure, so the two are not interchangeable and they describe different parts of the extract. A single grade keeps ordering simple: each lot is measured against the same pair of targets and the same procedure.

The same plant is also supplied as a 10:1 ratio extract without a marker figure, the Picrorhiza Kurroa Extract Powder, as a milled rhizome, Kutki Root Powder, and as a purified glycoside, Picroside I 98%. Specifications that must show picrosides and bitter principles are served by this standardized grade.

The rhizome is the part used, and the supply side explains why. Picrorhiza kurroa grows at high altitude on damp rock slopes, takes years to mature and is mostly collected from the wild, so lots vary with collection area, altitude and age. The extract is defined by the species and by two figures, and a lot made from young or thin rhizome shows a lower picroside share than one made from mature rhizome.

Picroside Analysis & Purity Risks

HPLC separates picroside I, picroside II and kutkoside on a reversed-phase column and detects them in the UV, where the cinnamoyl and vanilloyl groups absorb. Each picroside is quantified against its own reference standard, and the picroside figure is the sum of the identified picrosides. The ratio of picroside I to picroside II is a profile feature, and lots from different elevations and regions can differ in it.

The bitter principles figure is read separately. It counts the bitter-tasting fraction as a group and includes iridoids, cucurbitacin-type compounds and phenolic glycosides, so it is higher than the picroside figure and cannot be converted into a picroside content.

Identity is read from the fingerprint. The picrosides with kutkoside and the phenolic glycosides form a pattern typical of kutki, and this pattern separates the extract from root drugs sold as substitutes. Because picrosides are iridoid glycosides, the extract is sensitive to acid and enzymes, and the fingerprint also shows breakdown products if the lot was poorly handled.

Botanical substitution is the main risk. The Chinese relative Picrorhiza scrophulariiflora, sold as hu huanglian, is a similar rhizome with a different picroside balance, and other bitter roots such as those of Gentiana and Swertia are sold under similar names. Because the Himalayan plant is wild-harvested and slow to regrow, adulteration with other roots is a recognized supply risk. The stated species and the rhizome are part of the identity.

Raw rhizome is dug in autumn, washed and dried in the shade. Rhizome stored damp loses picrosides to enzymatic hydrolysis, and the extract is darker and weaker.

Sample preparation affects the reading. Picrosides dissolve in methanol, and the solution is filtered and injected promptly, because the ester groups hydrolyze on standing, especially in neutral or alkaline solution. Standard solutions are prepared fresh, kept cool and discarded after a day, so that the calibration of picroside I and II stays reliable.

Typical Specifications

Specification Item	Product Information
Latin Name	Picrorhiza kurroa
Plant Part	Root & Rhizome
Processing	Ethanol Extraction
Compound Class	Iridoids, Terpenoids
Common Name	Kutki, Picrorhiza
Ingredient Type	Standardized Extract
Marker Compound(s)	Picrosides; Bitter Principles
Primary Grade	4% Picrosides + 8% Bitter Principles (HPLC for picrosides)
Appearance	Light Brown powder
Solubility / Dispersibility	Slightly Soluble in Water
Quality Parameters
Moisture (LOD)	≤5.0%
Total Ash	≤5.0%
Particle Size	80 mesh
Heavy Metals	Lead ≤2 ppm · Arsenic ≤1 ppm · Cadmium ≤1 ppm · Mercury ≤0.1 ppm
Microbiology	TPC ≤1,000 cfu/g · Yeast & Mold ≤100 cfu/g · E. coli Negative · Salmonella Negative/25 g
Shelf Life	24 months in unopened original packaging, cool and dry storage

Applications by Grade

4% Grade in Intensely Bitter Capsule Fills

The 4% grade of Picrorhiza kurroa extract fits two-piece capsules at a modest fill weight. The powder is intensely bitter and slightly hygroscopic, so closed charging, opaque shells and a dry filling room protect operators and keep capsule weights steady.

4% Grade in Coated Tablets

Tablets of the 4% Picrorhiza kurroa grade need a dry binder and a thick film coat, because the bitterness is strong enough to be noticed at the tablet surface. A hardness check after a month of storage confirms that the glycosides have not pulled moisture into the core.

4% Grade in Herbal Powder Blends

Dry herbal blends carry the 4% grade beside other bitter roots. The extract is finer than the cut rhizome, so it is premixed with part of the carrier to avoid layering, and the blend is sampled from several depths to confirm that the picrosides are evenly spread.

4% Grade in Granule Sachets

Granulated sachets carry the 4% grade with a sweet or honey-type base, which masks some of the bitterness. Because the extract dissolves only partly, the drink is a hazy brown suspension, and the label should say to stir before drinking.

4% Grade in Chew and Gum Bases

Chew and gum bases hold the 4% grade in a lipid or polymer matrix that slows release and softens the bitter impact. Cooking temperatures should stay moderate, since heat and acid hydrolyze iridoid glycosides, and color is checked after storage.

Technical & Quality Considerations

Picrorhiza kurroa extract is a light brown powder with an intensely bitter, earthy and faintly woody character. It is only slightly soluble in water. The picrosides dissolve better in warm water and aqueous alcohol, while the less polar material settles as a fine sediment in still liquids.

In acidic drinks and in the presence of glycosidases from fresh plant ingredients, picrosides can hydrolyze, which changes the profile and darkens the product. The ester bond is also cleaved by strong alkali. Neutral to mildly acidic bases, short heat treatment and enzyme-free ingredients hold the marker.

If the pack is left open, moisture is taken up and the powder cakes and darkens. Closed charging and local extraction keep the intensely bitter dust out of the air at the filler, and cleaning between lots prevents carry-over of the taste.

A receiving check helps: a light brown, fine powder with a dry, bitter note is expected, while a very dark shade points to heat damage and a musty smell suggests damp rhizome. Then an accelerated stability run in the intended pack shows early whether color, flow, taste and the picroside figure hold across the shelf life.

Packaging & Commercial Supply

Essencefield supports product evaluation, formulation trials, commercial orders, and ongoing ingredient supply. Packaging, storage, and shipping arrangements are determined by product characteristics, order quantity, stability requirements, and destination-market needs.

Supply Item	General Information
Sample	Available upon request for formulation, testing, and supplier evaluation
Order Quantities	100 g · 1 kg · 5 kg · 25 kg · 100 kg · 500 kg · Bulk
Sample Lead Time	Typically 5–7 days after sample confirmation
Production Lead Time	Typically 15–30 days after order and specification confirmation
Packaging	Suitable protective inner packaging with bags, cartons, drums, or other appropriate outer packaging
Storage	Store in tightly sealed, suitable protective packaging in a cool, dry environment. Protect from moisture, heat, and direct sunlight. Specific storage conditions follow the approved product specification.
Documentation	COA · Product Specification · TDS · SDS · Applicable declarations (as applicable)

Final order quantities, lead times, packaging, documentation, and shipping arrangements are confirmed according to the selected product and commercial requirements.