Ginger Extract Specifications: Gingerol, Moisture & Particle Size

Ginger extract powder is widely used as a natural flavoring and functional ingredient in food, beverage, and supplement formulations. However, products offered under the name “ginger extract” can differ considerably in composition, concentration, extraction method, carrier content, moisture level, and physical characteristics.

For international buyers, reviewing only the product name or extract ratio is not sufficient. A reliable purchasing specification should clearly explain how the product is identified, how its active compounds are measured, and how its physical quality is controlled.

Among the most important parameters are:

Gingerol content
Moisture or loss on drying
Particle-size distribution

These three specifications influence the extract’s pungency, consistency, storage stability, processing performance, and suitability for the buyer’s intended application.

Ginger Extract Powder Is Not the Same as Ginger Powder

Before comparing specifications, buyers should distinguish ginger extract powder from ordinary ground ginger.

Ground ginger powder is produced by drying and milling ginger rhizomes. It still contains much of the original plant material, including fiber, starch, and other naturally occurring components.

Ginger extract powder, by contrast, is produced by extracting selected compounds from ginger rhizomes using water, ethanol, or another suitable extraction medium. The liquid extract is then concentrated and converted into powder, commonly through spray drying or another drying process.

Carriers such as maltodextrin, gum arabic, or other food-grade materials may be added to improve powder stability, drying performance, and handling characteristics. Consequently, the final concentration of ginger compounds depends on the extraction solvent, raw-material-to-extract ratio, drying process, and amount of carrier used.

ISO 1003:2025 provides requirements for whole, pieces, and ground dried ginger. It should not automatically be treated as a complete specification for standardized ginger extract powder, which requires additional parameters agreed between the buyer and supplier.

1. Understanding Gingerol Content

What Are Gingerols?

Gingerols are naturally occurring pungent phenolic compounds found in ginger rhizomes. The principal compounds commonly evaluated include:

6-gingerol
8-gingerol
10-gingerol

Shogaols, particularly 6-shogaol, are related pungent compounds that may form through dehydration of gingerols during drying, heating, storage, or processing.

The proportions of these compounds can vary according to ginger variety, maturity, growing location, drying conditions, extraction solvent, extraction temperature, and storage history. Research has also shown that aqueous extraction and processing can produce a different gingerol–shogaol profile from that of the original raw herb.

Why Gingerol Content Matters

Gingerol content is commonly used as a chemical marker for evaluating the concentration and batch consistency of ginger extract.

A higher declared gingerol percentage generally indicates a more concentrated standardized extract. However, it does not automatically mean that the product is better for every application.

For example:

A strongly standardized extract may suit capsules and concentrated supplement formulations.
A lower-concentration extract may be more appropriate for beverages requiring balanced pungency.
A flavor formulation may require a broader ginger profile rather than a high level of one isolated marker.
An instant drink may prioritize dispersibility, aroma, and sensory balance over maximum gingerol concentration.

The required specification should therefore be based on the final product and intended dosage.

“Gingerol Content” Must Be Clearly Defined

One of the most common specification problems is the use of the phrase “gingerol content” without explaining what is included.

The declaration could refer to:

6-gingerol only;
The combined amount of 6-, 8-, and 10-gingerol;
Total gingerols plus selected shogaols;
Total pungent compounds calculated using a particular analytical method.

These measurements are not interchangeable. A result reported as 5% 6-gingerol cannot be directly compared with another result reported as 5% total gingerols and shogaols.

The purchasing specification and Certificate of Analysis should identify:

The compounds included in the calculation;
Whether the result is reported on an as-is or dry basis;
The analytical method;
The reference standards used;
The unit of measurement;
The required minimum or acceptable range.

HPLC Analysis of Gingerols

High-performance liquid chromatography, or HPLC, is an appropriate technique for separating and quantifying individual gingerols and shogaols.

ISO 13685:1997 specifically covers the determination of the main pungent compounds in ginger and ginger oleoresins using HPLC. The standard was reviewed and confirmed by ISO in 2024, meaning that it remains current.

Validated HPLC methods have also been developed to measure 6-gingerol, 8-gingerol, 10-gingerol, and 6-shogaol in ginger supplements, spices, beverages, and other ginger-containing products.

A buyer should not accept a percentage claim without asking how it was measured. HPLC results are more informative when the COA includes individual values rather than presenting only an undefined “total gingerol” number.

Example Gingerol Specification

A possible buyer-defined specification might state:

Total gingerols: minimum 5.0% by HPLC, calculated as the sum of 6-gingerol, 8-gingerol, and 10-gingerol on a dry basis.

Alternatively:

6-Gingerol: minimum 5.0% by HPLC on a dry basis.

These are two different products and should not be treated as equivalent.

The percentage selected must be agreed according to the buyer’s formulation, regulatory category, target market, sensory requirements, and serving size. There is no single gingerol percentage that is universally suitable for every ginger extract powder.

2. Moisture and Loss on Drying

Why Moisture Control Is Important

Moisture affects the physical condition and storage behavior of ginger extract powder.

Excessive moisture may contribute to:

Caking and lump formation;
Reduced powder flow;
Packaging problems;
Difficulty during weighing and dosing;
Changes in color or aroma;
Reduced storage stability;
Greater vulnerability to quality deterioration.

However, low moisture alone does not guarantee microbiological safety. Codex guidance explains that microorganisms such as Salmonella may remain viable for extended periods in low-moisture foods even when they cannot multiply. Hygienic processing, validated microbial controls, and appropriate environmental monitoring therefore remain essential.

Moisture Content vs Loss on Drying

The terms moisture content and loss on drying are sometimes used as though they mean exactly the same thing. They may produce similar results in certain powders, but they measure different things.

Moisture content is intended to determine the amount of water in the material.

Loss on drying, or LOD, measures the total mass lost under specified drying conditions. Depending on the product and method, the result may include water and other volatile substances.

This distinction is relevant to ginger because it naturally contains volatile aromatic compounds. A high-temperature oven method may therefore measure more than water alone.

ISO 939:2021 specifies an entrainment method for determining moisture in spices and condiments. For processed extract powders, other validated methods—such as oven loss on drying or Karl Fischer titration—may also be used when appropriate. The buyer and supplier should use the same method when comparing results.

What Moisture Limit Should Buyers Request?

There is no universal moisture limit for every ginger extract powder. The appropriate limit depends on:

The extract concentration;
The carrier material;
The drying method;
The hygroscopicity of the powder;
Packaging type;
Storage conditions;
Intended shelf life.

For a spray-dried ginger extract powder, a buyer might use the following as an initial commercial specification:

Moisture or loss on drying: maximum 5.0%.

This should be treated as a buyer-defined starting point rather than a universal ISO or Codex requirement. The actual limit must be confirmed against the supplier’s production capability, stability data, test method, and product composition.

Consider Adding Water Activity

Moisture percentage shows how much water is present, while water activity indicates how much of that water is available to support chemical and microbiological processes.

Products with similar moisture percentages can have different water-activity values because their carriers, sugars, fibers, and other solids bind water differently.

For technically demanding beverage or supplement applications, requesting water-activity information can provide a more complete understanding of powder stability. The FDA recognizes water activity as a key factor affecting the ability of microorganisms to grow in food, although controlling water activity does not replace adequate microbiological controls.

3. Particle Size and Mesh Specification

Why Particle Size Matters

Particle size influences how ginger extract powder behaves during production and in the finished formulation.

It may affect:

Powder flow;
Mixing uniformity;
Dispersion;
Wettability;
Sedimentation;
Mouthfeel;
Capsule filling;
Tablet manufacturing;
Dust formation;
Visual appearance.

A fine powder may disperse more easily and produce a smoother beverage, but extremely fine particles may become cohesive, dusty, and more difficult to handle.

A coarser powder may flow better in certain applications but could produce visible particles, slower dispersion, or sediment in beverages.

Studies involving ginger have shown that particle size can affect extraction behavior and the recovery of antioxidant compounds because smaller particles generally provide greater surface area. However, the optimum size depends on the process and application rather than following a simple “finer is always better” rule.

Mesh Size Must Be Supported by a Test Method

Particle size is frequently described using mesh terminology, such as:

40 mesh;
60 mesh;
80 mesh;
100 mesh.

A higher mesh number generally represents a finer powder. Nevertheless, “80 mesh” alone is not a complete specification.

The buyer should state:

The sieve standard;
The percentage required to pass through the sieve;
The test method;
Whether the result represents a single cut-off or full distribution;
The sample-conditioning procedure.

For example:

Particle size: minimum 90% passing through an agreed 80-mesh sieve.

This is more useful than simply writing:

Particle size: 80 mesh.

ISO 3588 provides a hand-sieving reference method for determining the degree of fineness of ground spices. For pharmaceutical and supplement powders, USP General Chapter <786> describes particle-size distribution estimation using analytical sieving. USP notes that traditional mechanical sieving is generally most suitable when most particles are larger than approximately 75 micrometres; finer or highly cohesive materials may require alternative techniques.

Mesh Analysis vs Laser Diffraction

Sieve analysis is practical for routine commercial quality control, but it may not provide a complete picture of fine spray-dried particles.

Laser diffraction can report a distribution using values such as:

D10: 10% of particles are smaller than this diameter;
D50: median particle diameter;
D90: 90% of particles are smaller than this diameter.

For beverage and supplement manufacturers, D10, D50, and D90 values can provide better batch-to-batch comparison than a single mesh declaration.

The selected method should be written into the purchasing agreement because sieve results and laser-diffraction results cannot always be directly compared.

Suggested Ginger Extract Powder Specification

The following table is an example for buyer–supplier discussion. It is not a universal regulatory standard.

Parameter	Example Requirement	Suggested Test Method
Product identity	Ginger rhizome extract powder, Zingiber officinale Roscoe	Identification or chromatographic fingerprint
Plant part	Rhizome	Production documentation
Appearance	Yellowish-brown to brown, free-flowing powder	Visual
Extraction solvent	Water, ethanol–water, or buyer-approved solvent	Production documentation
Extract ratio	Declared by supplier, such as 5:1 or 10:1	Manufacturing records
Gingerol standardization	Buyer-defined, such as ≥5.0% total gingerols	HPLC
Moisture or LOD	≤5.0% as an example starting limit	Agreed validated method
Particle size	≥90% passing agreed 80-mesh sieve	Analytical sieving
Carrier	Type and percentage declared	Formulation records
Solubility or dispersibility	Application-specific	Agreed in-house method
Bulk density	Report actual result or agreed range	Compendial or validated method
Total plate count	Buyer- and market-specific	Recognized microbiological method
Yeast and mold	Buyer- and market-specific	Recognized microbiological method
E. coli	Absent or compliant with agreed limit	Recognized microbiological method
Salmonella	Absent in agreed sample quantity	Recognized microbiological method
Heavy metals	Comply with destination-market limits	ICP-MS, ICP-OES, or validated method
Pesticide residues	Comply with destination-market MRLs	Validated multi-residue method

How to Compare Certificates of Analysis

When evaluating quotations from different ginger extract suppliers, buyers should compare more than the headline specification.

Confirm the Calculation Basis

Determine whether gingerol and moisture results are reported:

On an as-is basis;
On a dry basis;
Before or after carrier addition;
As an individual compound or total group.

Check the Extraction Information

Request information about:

Raw-material origin;
Ginger variety, when available;
Plant part;
Extraction solvent;
Extract ratio;
Carrier type;
Carrier percentage;
Drying method.

Two products labeled “ginger extract 10:1” may have different gingerol concentrations because an extract ratio alone does not define the chemical composition.

Request a Batch-Specific COA

A generic technical data sheet describes the supplier’s target specification. A batch-specific Certificate of Analysis shows the actual results for the manufactured lot.

For commercial orders, buyers should request:

Batch number;
Production date;
Retest or expiry date;
Actual gingerol result;
Actual moisture result;
Particle-size result;
Microbiological results;
Heavy-metal results;
Packaging information.

Evaluate Application Performance

A product may meet its chemical specification but still perform poorly in a particular formulation.

Before placing a large order, buyers should conduct a sample evaluation covering:

Taste and pungency;
Aroma;
Color;
Dispersibility;
Sedimentation;
Solubility;
Powder flow;
Compatibility with other ingredients;
Stability in the finished product.

Recommended Specifications by Application

Food Seasonings and Dry Blends

Important parameters include:

Balanced ginger flavor;
Uniform color;
Controlled particle size;
Good mixing behavior;
Low caking tendency;
Suitable microbiological quality.

Instant Beverages

Buyers should prioritize:

Dispersibility;
Low sedimentation;
Controlled particle-size distribution;
Consistent pungency;
Declared carrier;
Moisture and water activity;
Flavor stability.

A standard ginger extract powder is not necessarily completely water-soluble. Buyers requiring a clear beverage should specifically request a water-soluble or clarified product and define the testing conditions.

Dietary Supplements

Supplement manufacturers may require:

Defined gingerol or pungent-compound standardization;
HPLC chromatographic profile;
Tight batch-to-batch consistency;
Controlled moisture;
Particle-size distribution suitable for capsules or tablets;
Microbiological and contaminant compliance;
Stability data;
Documentation appropriate to the destination market.

Product specifications and marketing claims must comply with the food-supplement regulations of the importing country.

Key Questions to Ask a Ginger Extract Supplier

Before confirming an order, buyers should ask:

Is the gingerol result based on 6-gingerol only or total gingerols?
Are shogaols included in the declared percentage?
Is the result reported on an as-is or dry basis?
Which HPLC method is used?
What extraction solvent is used?
What is the actual extract ratio?
Is a carrier added, and at what percentage?
Is moisture measured as water content or loss on drying?
Which particle-size method and sieve standard are used?
What percentage passes through the declared mesh?
Can the supplier provide a batch-specific COA?
Is a pre-shipment sample available for formulation testing?

Conclusion

Gingerol content, moisture, and particle size are three essential specifications for evaluating ginger extract powder, but they must be interpreted correctly.

Gingerol content should clearly identify the compounds measured, the calculation basis, and the HPLC method. Moisture should be supported by a defined test procedure and should not be confused automatically with loss on drying. Particle size should state both the sieve or measurement method and the percentage of material meeting the requirement.

The most reliable purchasing specification is therefore not simply:

Ginger extract powder, 5% gingerol, 80 mesh.

A more complete description would be:

Ginger rhizome extract powder standardized to a buyer-defined minimum total gingerol content by HPLC, with moisture or loss on drying within the agreed limit and at least the specified percentage passing an identified sieve standard.

International buyers looking for a Ginger Extract Supplier from Indonesia should request complete technical documentation and evaluate a representative sample before approving commercial production.

For food, beverage, and supplement applications, Indonesia Export Center can assist buyers in discussing the required gingerol concentration, extraction type, carrier, particle size, packaging, order quantity, and export documentation with potential Indonesian supply sources.

References

International Organization for Standardization. ISO 13685:1997—Ginger and its oleoresins: Determination of the main pungent components using HPLC.
International Organization for Standardization. ISO 1003:2025—Whole/pieces and ground dried ginger specification.
International Organization for Standardization. ISO 939:2021—Determination of moisture content in spices and condiments.
International Organization for Standardization. ISO 3588:1977—Determination of degree of fineness of grinding by hand sieving.
United States Pharmacopeia. General Chapter <786>: Particle Size Distribution Estimation by Analytical Sieving.
Codex Alimentarius. CXC 75-2015—Code of Hygienic Practice for Low-Moisture Foods.
European Medicines Agency. Assessment Report on Zingiber officinale Roscoe, Rhizoma.
Schwertner, H.A. and Rios, D.C. High-performance liquid chromatographic analysis of gingerols and shogaol in ginger-containing products.
Lee, S. et al. Liquid chromatographic determination of gingerols and shogaol in raw ginger and ginger extracts.
Makanjuola, S.A. et al. Influence of particle size and extraction solvent on antioxidant properties of ginger-containing extracts.

Ginger Extract