Rose Petal Extract 10–50% Polyphenols

Rose petal extract is prepared from the flowers of the rugosa rose, Rosa rugosa Thunb., a shrub of the family Rosaceae, and is standardized to total polyphenols. Ethanol extraction concentrates the phenolic fraction of the petals, which is dried to a purple-red powder.

The Folin-Ciocalteu reagent and UV spectrophotometry give the total polyphenols. The primary grade is 50% and the lower grade is 10%. The powder is 80 mesh and water soluble, so it suits drink powders, capsules and tablets.

SKU: BOT-STX-0221 Category: Standardized Extracts Tags: Ethanol Extracted, Flower, Gummies & Chews, Polyphenols, Rose Petal, Standardized Extracts

Rose Petal Polyphenol Standardization & Grades

Rose petals are unusually rich in hydrolyzable tannins. In Rosa rugosa these are ellagitannins such as the rugosins and tellimagrandins, which sit beside flavonol glycosides of quercetin and kaempferol, phenolic acids and, in dark-flowered forms, anthocyanins. Rose petal extract is standardized to total polyphenols because the class covers the tannin and flavonol families together, and the class figure is stable from lot to lot.

The botanical entity is Rosa rugosa Thunb., and the part is the flower petal. The scented volatile fraction of the petals, with citronellol, geraniol and phenylethyl alcohol, is not part of the standardized fraction, and it is largely lost in drying and ethanol concentration. Rose petal is also supplied as a 10:1 ratio extract, the Rose Flower Extract Powder, as the milled flower, Rose Petal Powder, and in a hydrolyzed protein form, Rose Peptide Powder.

Grade	Assay & Method	Where It Fits
10% Polyphenols	UV (Folin-Ciocalteu)	Drink powders, bulk blends
50% Polyphenols	UV (Folin-Ciocalteu)	Capsules, tablets, effervescent

The 50% grade carries five times the polyphenol load of the 10% grade per gram, so a capsule or an effervescent tablet reaches its target with a small charge. The 10% grade is bulkier and more floral in color, and it suits blends in which the purple-red tone of the powder is useful. Both grades share the same reagent basis, so a formulator can scale between them by weight, and the choice depends on how much color and bulk the formula can carry.

Rose Petal Polyphenol Analysis & Purity Risks

In the Folin-Ciocalteu assay, phenolic groups reduce a molybdenum-tungsten reagent, which turns blue, and the absorbance is calculated against a reference phenol such as gallic acid. The percentage is therefore a reducing-capacity equivalent. Other reducing substances in the sample also react, so the figure is read together with an HPLC fingerprint, and it cannot be converted into a result for individual ellagitannins.

A second class is followed separately. The anthocyanins of dark petals are measured by their own method and are not part of the total, so two lots with the same total can differ in red tone and in the weight of pigment they carry. The tannins and the pigments behave differently in light, heat and pH, which is why the profile and not only the percentage defines the lot.

Purity risks follow from the material class. The genus Rosa is large, and rose petals sold under the same trade name can come from other species, such as Rosa damascena or Rosa centifolia, which are grown for oil and carry different chemistry. The petal is the defined part. Buds, sepals and hips add more tannin and less pigment, and the ratio shifts the color of the finished powder.

Sample preparation follows the color. The powder is dissolved, the reagent is added, and a sample blank is run so that the purple-red pigment is not read as phenolic response in the visible range.

Harvest and drying shape the result as well. Petals are picked at full bloom and dried quickly at moderate temperature, because slow drying lets enzymes oxidize the tannins and brown the pigment. A lot dried too hot loses scent and turns a dull purple-brown.

Typical Specifications

Specification Item	Product Information
Latin Name	Rosa rugosa
Plant Part	Flower
Processing	Ethanol Extraction
Compound Class	Polyphenols
Common Name	Rose Petal, Rugosa Rose
Ingredient Type	Standardized Extract
Marker Compound(s)	Total polyphenols (ellagitannins, flavonol glycosides, phenolic acids)
Primary Grade	50% Polyphenols (UV, Folin-Ciocalteu)
Available Grades	10% · 50% Polyphenols (UV, Folin-Ciocalteu)
Appearance	Purple Red powder
Solubility / Dispersibility	Water Soluble
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

50% Grade for Capsule Fills

The 50% grade reaches its polyphenol target in a small capsule fill. The powder is hygroscopic and mildly sticky, so a dry filling room and a flow agent keep the hopper from bridging and the fill weight steady. The purple-red powder stains gelatin shells lightly, which is visible only in clear capsules.

10% Grade in Drink Powders

The 10% grade dissolves in cold water to a clear purple-red drink and contributes a mild floral, astringent note. Fruit and berry flavors blend with it, and the color holds best in acidic drinks. In neutral water the tone drifts toward violet and then dull brown.

50% Grade in Effervescent Tablets

Effervescent tablets use the 50% grade because it dissolves quickly and keeps the tablet small. The effervescent acid system shifts the pH, and the color moves toward red in the glass and is checked in stability trials.

10% Grade for Gummy Bases

Gummies take the 10% grade as a color-contributing ingredient. Add it after the main cook, because long heating dulls the purple-red tone, and check the gel pH since tannin-type material can toughen a protein-based set. Pectin bases tolerate it better.

50% Grade in Tablet Blends

Tablets of the 50% grade need a dry binder and a lubricant. A film coat limits moisture uptake and staining of the punch faces. Tablet hardness is rechecked after storage because the tannin-rich solid is hygroscopic and softens in humid rooms.

10% Grade for Stick-Pack Mixes

Stick-pack mixes use the 10% grade at higher gram weight with a bulking carrier. Avoid protein-based carriers, since the tannins bind proteins and produce haze in the stirred drink. A plain maltodextrin carrier keeps the cup clear and the red tone clean.

Technical & Quality Considerations

Rose petal extract is a purple-red powder with a faint dried-flower scent and a dry, astringent taste. It is water soluble, and the solution is a clear red that moves toward purple as pH rises. Ellagitannins and anthocyanins both oxidize in light and oxygen, so clear packs are kept out of direct light and the color is monitored through shelf life.

Polyphenols chelate iron, which turns the powder and solutions dark, so stainless contact surfaces and low-iron fillers are the better choice. The powder takes up moisture readily and cakes in humid storage, so sealed liners, desiccant and cool storage are used.

Petal lots collected early in the flowering season contain more pigment, while late lots are paler and richer in tannin. Blending lots before extraction evens out the hue, and the color of the finished powder is checked against a retained sample for this reason.

A change of grade on the line calls for a fresh check weight, because the powders differ widely in bulk. A premix with part of the carrier before the main blend keeps the strongly colored powder from streaking the batch.

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.