Summary

There is no single spray-dried flavor carrier suitable for every formulation. Maltodextrin is mainly used to increase feed solids, support powder formation, and control cost, but its emulsifying capacity is generally limited. Gum arabic provides both emulsifying and film-forming properties, making it suitable for flavors with a higher oil content or greater volatility. Emulsifying modified starches, particularly starch sodium octenylsuccinate, can provide a balance among emulsion stability, flavor protection, and industrial consistency.

Carrier selection should consider emulsion droplet size, feed viscosity, spray-drying yield, surface oil, flavor retention, moisture absorption, caking, and release performance in the final application. In many projects, maltodextrin is combined with gum arabic or an emulsifying modified starch rather than used as the sole wall material.

How to Make a Quick Initial Selection Among the Three Flavor Carriers

This table can be used to narrow down the initial sample range, but it cannot replace emulsion and spray-drying tests. The same carrier may perform very differently when used with citrus oil, peppermint oil, spice oleoresin, or a compounded flavor.

Define the Selection Boundaries Based on the Flavor System and Spray-Drying Conditions

Oil Content Determines the Required Emulsifying Capacity

When the oil content is relatively low and the formulation already contains an effective emulsifier, maltodextrin can serve as the primary wall material.

As the oil content increases, stronger interfacial stabilization is required. Simply increasing the amount of maltodextrin may raise the feed solids content, but it may not resolve droplet coalescence, creaming, or increased surface oil after spray drying.

Citrus essential oils, peppermint oil, spice oleoresins, and other hydrophobic flavor ingredients generally require gum arabic, starch sodium octenylsuccinate, or another emulsifying system.

Flavor Volatility Determines the Main Protection Requirement

Spray drying is not simply a process for converting a liquid flavor into a powder. Emulsification, homogenization, atomization, and hot-air drying can all cause flavor components to migrate or be lost.

For flavors containing relatively high levels of terpenes, aldehydes, esters, or other highly volatile components, carrier selection should consider:

• Whether the emulsion remains stable before entering the spray dryer;
• Whether oil droplets are likely to rupture during atomization;
• Whether the dried powder has excessive surface oil;
• Whether the product is susceptible to oxidation during storage;
• Whether key flavor compounds are selectively lost.

A powder that meets its moisture specification does not necessarily provide acceptable flavor protection.

Feed Solids and Viscosity Determine Equipment Compatibility

Increasing feed solids generally helps reduce evaporation load and improve output per unit time. However, excessively high solids may increase viscosity, impair atomization, block nozzles, or make particle size difficult to control.

Different carriers do not show the same viscosity changes at increasing concentrations. When comparing samples, the following conditions should be standardized:

• Test concentration;
• Water temperature;
• Hydration or dissolution time;
• Shear conditions;
• Test temperature;
• Viscometer model, spindle, and speed.

A single viscosity value without the test conditions generally has little value for direct comparison.

The Final Application Determines the Required Flavor Release Profile

Spray-dried powders encounter different conditions when used in powdered beverages, seasoning blends, bakery products, confectionery, or dairy products.

The following should be clarified in advance:

• Whether the product is dispersed in cold water or reconstituted in hot water;
• Whether rapid top-note release is required;
• Whether the product undergoes baking, sterilization, or other heat treatment;
• The pH and salt content of the final system;
• Whether the system contains protein, acids, or minerals;
• The planned storage period of the powder;
• Whether the package will be repeatedly exposed to air and moisture after opening.

Carrier performance in the spray dryer is only one part of the validation process. Release behavior, turbidity, sedimentation, and flavor changes in the final formulation also determine whether the material is suitable.

Identity Differences Among Maltodextrin, Gum Arabic, and Modified Starch

Maltodextrin

The CAS number commonly used for maltodextrin is 9050-36-6. It is a saccharide polymer produced by partial hydrolysis of starch. Its main functions include increasing feed solids, supporting powder formation, adjusting viscosity, and reducing formulation cost.

Maltodextrin is generally not a strong emulsifier. For systems with a relatively high oil content, it is more suitable as the main wall material in combination with gum arabic, an emulsifying modified starch, or another emulsifier.

Gum Arabic

Gum arabic, also known as acacia gum, has the CAS number 9000-01-5 and INS number 414. In the EU food additive system, it is identified as E414.

Gum arabic provides both emulsifying and film-forming properties. It can stabilize the oil-water interface and form a protective layer during drying. Because it is derived from natural plant sources, differences in botanical source, origin, and purification process may affect viscosity, color, odor, and emulsification performance.

Emulsifying Modified Starch

“Modified starch” is a material category rather than a single product, and there is no single CAS number that covers all modified starches.

A material commonly used for spray drying oil-soluble flavors is starch sodium octenylsuccinate, with the CAS number 66829-29-6 and INS number 1450. In the EU food additive system, it is identified as E1450.

This material is modified to introduce both hydrophilic and hydrophobic structures, which enables it to stabilize the oil-water interface. A procurement document that only states “modified starch” is not sufficient for product identification. The modification type, regulatory number, and base starch source should also be specified.

Procurement Performance Comparison of the Three Carriers

Price is only the initial difference. The actual procurement result depends on carrier dosage per unit of acceptable flavor powder, flavor loss, spray-drying yield, and storage stability.

How to Select Maltodextrin

The DE Value Must Be Specified

DE means dextrose equivalent and reflects the degree of starch hydrolysis. Maltodextrin grades with different DE values do not have the same molecular-weight distribution, sweetness, viscosity, or hygroscopicity.

In general:

• As DE increases, the average molecular chain becomes shorter, and dissolution may become faster;
• A higher DE may increase sweetness and hygroscopicity;
• A lower DE may result in higher feed viscosity;
• Different DE grades may change powder glass-transition behavior and wall-deposition risk.

The procurement specification should therefore not state only “food-grade maltodextrin.” It should define the DE range, test method, and allowable variation.

A lower DE is not necessarily better. Selecting a grade with an excessively low DE may cause feed viscosity to exceed the equipment limit, while a grade with an excessively high DE may increase caking risk in high-humidity environments.

Base Starch Source Affects Labeling and Replacement Validation

Maltodextrin may be produced from corn, potato, rice, and other commercially used starch sources. Differences in the base starch may affect:

• Customer labeling or non-GMO requirements;
• Dissolution rate;
• Powder odor and color;
• Viscosity performance;
• The difficulty of replacing one supplier with another.

The raw material source should be stated in the supplier specification or a formal declaration rather than confirmed only through verbal communication.

Maltodextrin Is More Suitable as the Main Wall Material

The main advantages of maltodextrin are its ability to increase solids and support powder formation. In low-oil formulations that already contain an emulsifying system, it can account for a large proportion of the wall material.

When the oil content is high, maltodextrin generally needs to be combined with an emulsifying carrier. Otherwise, even if the spray-drying process produces powder normally, surface oil and storage oxidation risks may remain high.

How to Select Gum Arabic

Botanical Source and Purification Grade Should Be Defined

Gum arabic is a naturally derived material. Its procurement specification should define at least:

• Botanical source;
• Origin or production source;
• Whether it has been clarified or purified;
• Color and odor;
• Viscosity of the hydrated liquid or dispersion;
• Acid-insoluble matter;
• Ash;
• Microbiological requirements;
• Emulsification test conditions.

Even when basic physicochemical indicators are similar, products from different sources may show different emulsion droplet sizes and storage stability.

Hydration Directly Affects Emulsification Results

Gum arabic must be adequately hydrated before its emulsifying properties can be fully developed. The following conditions should be standardized when comparing samples:

• Order of addition;
• Water temperature;
• Agitation speed;
• Hydration time;
• Standing or deaeration conditions;
• Filtration method.

Insufficient hydration may result in undispersed particles, unstable emulsions, filtration difficulties, or abnormal viscosity data.

Viscosity Must Be Compared Under the Same Conditions

Gum arabic can maintain a certain degree of fluidity at relatively high solids, but this performance depends on the product grade and test method.

Viscosity data from two suppliers are directly comparable only when concentration, temperature, hydration time, and shear conditions are the same.

How to Select Emulsifying Modified Starch

First Confirm Whether It Is the Required Modification Type

Oxidized starch, acetylated starch, phosphate starch, hydroxypropyl starch, and starch sodium octenylsuccinate do not provide the same functions.

A spray-dried flavor project requires a specific grade capable of stabilizing the oil-water interface, rather than just any food-grade modified starch.

Product identification should include at least:

• Complete product name;
• CAS number;
• INS or E number;
• Base starch source;
• Whether the product is pregelatinized;
• Recommended hydration conditions;
• Recommended concentration range;
• Suggested oil loading;
• Regulatory identity in the target market.

Degree of Modification Affects Interfacial Performance

Octenylsuccinyl groups give starch a certain degree of interfacial activity. The degree of modification, base starch structure, and manufacturing process together affect:

• Oil droplet size;
• Emulsion stability;
• Feed viscosity;
• Surface oil after drying;
• Powder dispersibility;
• Batch consistency.

The supplier should be able to describe the product identity, applicable purity parameters, and relevant residual controls rather than provide only a generic food-grade designation.

Products Labeled E1450 Are Not Automatically Interchangeable

Two products may both be labeled E1450 but still differ in base starch, pretreatment, viscosity, and emulsification performance.

After changing suppliers, emulsion droplet size, surface oil, spray-drying yield, and final application performance should be re-evaluated. Products should not be considered directly interchangeable solely because they share the same regulatory number.

Key Parameters Must Be Compared Using Standardized Methods, Not Just Numerical Values

Total Oil, Surface Oil, and Encapsulated Oil

Total oil is the entire detectable oil content in the powder, including oil protected within the wall material and oil located on the particle surface.

Surface oil is the oil extracted from the exterior or near-surface region of the powder using specified solvents, extraction times, and operating conditions. A high surface-oil level generally means that more flavor is exposed to oxygen, potentially increasing oxidation, volatilization, and packaging-contamination risks.

Encapsulated oil can be understood as total oil minus surface oil:

Encapsulated oil = Total oil − Surface oil

Encapsulation Efficiency

Encapsulation efficiency is commonly calculated from total oil and surface oil:

Encapsulation efficiency = (Total oil − Surface oil) ÷ Total oil × 100%

Different extraction solvents, extraction times, and operating methods may affect surface-oil results. Data from different suppliers or laboratories are therefore suitable for comparison only when the test methods are consistent.

A higher encapsulation efficiency does not necessarily mean better flavor performance. It should also be assessed together with key flavor-compound retention, oxidation status, and release behavior in the final application.

Flavor Retention

Flavor retention is used to evaluate the retention of specific volatile compounds before and after spray drying.

Testing only total oil may fail to reveal selective losses of highly volatile components. For citrus or mint flavors, representative marker compounds that reflect the key aroma profile should be selected for comparison.

Moisture and Water Activity

Moisture content reflects the total amount of water in the powder, while water activity reflects the availability of water for microbial growth and physical changes.

Two powder batches with similar moisture contents may still have different water activity, flowability, and caking tendencies. For products with a long shelf life or intended for sale in high-humidity environments, storage stability should not be assessed using moisture content alone.

Supplier Pre-Screening and Warning Signs

Questions That Supplier Pre-Screening Should Answer

Before beginning sample testing, at least the following should be confirmed:

1. Whether the product identity is complete and whether the sample label, specification, and COA are consistent;
2. Whether the maltodextrin has a defined DE range and base starch source;
3. Whether the gum arabic has a defined botanical source, purification grade, and hydration conditions;
4. Whether the modified starch states the specific modification type and INS or E number;
5. Whether application data are available for emulsification or spray drying under conditions similar to the target flavor system;
6. Whether the sample comes from the formal production plant;
7. Whether commercial orders can maintain the same product grade and production source as the sample;
8. Whether the supplier has a notification procedure for changes in raw materials, processes, or manufacturing sites.

Signals That Require Further Verification

The following do not necessarily mean that a product is unusable, but they significantly increase the required validation work:

• The description states only “food-grade modified starch” without identifying the specific material;
• Maltodextrin is supplied without a defined DE range;
• Gum arabic viscosity is provided without test conditions;
• “High encapsulation efficiency” is stated without a specific test method or experimental conditions;
• The supplier claims that one grade is suitable for all flavors and equipment;
• The sample comes from a laboratory batch rather than a formal production line;
• The COA includes only moisture, ash, and appearance, without key product-specific functional indicators;
• Historical data from multiple production batches cannot be provided;
• Product names are inconsistent across the specification, package label, and compliance declaration.

Sample Testing and Scale-Up Validation

Stage 1: Carrier Hydration or Dissolution Test

Under standardized water quality, temperature, and shear conditions, compare:

• Time required for complete dissolution or uniform hydration;
• Undispersed particles;
• Foaming;
• Color and odor;
• Viscosity at the target solids content;
• Sedimentation or phase separation after standing;
• Filtration performance.

The test concentration should be close to the actual feed solids. Observing dissolution only at low concentration cannot reflect feed viscosity and transfer risks during commercial production.

Stage 2: Emulsion Testing

Different samples should be tested using the same:

• Flavor oil content;
• Carrier dosage;
• Water-phase ratio;
• Order of addition;
• Premixing time;
• Homogenization pressure;
• Number of homogenization passes;
• Emulsion temperature.

The following should be recorded:

• Initial mean droplet size;
• Droplet-size distribution;
• Emulsion viscosity;
• Creaming, flotation, and phase separation after standing;
• Change in droplet size during storage;
• Odor and oxidation changes.

If different homogenization conditions are used for each sample, the final results cannot distinguish carrier differences from process differences.

Stage 3: Spray-Drying Test

The spray-drying stage should focus on comparing:

• Actual feed solids;
• Feed-process stability;
• Nozzle or atomizer-disc condition;
• Wall deposition;
• Powder yield;
• Powder moisture;
• Water activity;
• Total oil;
• Surface oil;
• Retention of key flavor compounds;
• Particle-size distribution;
• Bulk density;
• Flowability;
• Caking.

For high-value flavors, comparing only powder yield can be misleading. A high yield combined with significantly increased surface oil may indicate that more flavor is exposed on the particle surface.

Stage 4: Final-Application Testing

The spray-dried powder should be tested in the actual final formulation for:

• Dispersion and dissolution rate;
• Turbidity or sedimentation;
• Top, middle, and base-note performance;
• Flavor changes after heating;
• Stability in acidic, high-salt, or protein-containing systems;
• Moisture absorption after opening;
• Caking and oxidized odor after storage.

After successful laboratory testing, pilot-scale or commercial-scale validation under conditions close to the actual equipment should also be performed. Changes in atomization method, dryer design, residence time, and outlet temperature may alter wall deposition and flavor retention.

How to Cross-Check Specifications, Batch Consistency, and Documentation

Regulatory Specifications Are Not the Same as Functional Specifications

Spray-drying carriers generally need to meet three types of requirements:

Compliance with the regulatory identity only confirms that the material has the relevant legal basis for use. It does not prove that the material is suitable for a particular flavor formulation.

COAs and Specifications Serve Different Purposes

A specification represents the supplier’s long-term control range, while a COA represents the test results of a specific delivered batch.

The review of specifications, COAs, and related compliance documents should confirm:

• Consistent product names;
• COA test items consistent with the specification;
• Key indicators are not consistently close to the upper or lower limits;
• Test methods have not changed without notification;
• COA data are consistent with internal application-test trends.

Passing basic physicochemical specifications does not guarantee stable emulsification performance. For critical carriers, simplified internal functional release methods may be established, such as emulsion droplet size under fixed conditions, phase separation after standing, or surface-oil testing using a small-scale spray dryer.

Batch Consistency Should Be Determined According to Project Risk

For flavors with a high oil content, high volatility, or high replacement difficulty, data from three or more production batches may be compared as a priority.

Key items to monitor include:

• Variation in maltodextrin DE and viscosity;
• Gum arabic color, viscosity, and emulsification performance;
• E1450 viscosity, emulsion droplet size, and identity parameters;
• Moisture;
• Particle size;
• Bulk density;
• Microbiological quality;
• Hydration or dissolution time.

Changes that generally require advance notification include base raw material source, botanical source, manufacturing site, modification process, key processing aids, test methods, and packaging format.

EU Market Requirements Related to the 2026 Specification Changes

The basic EU authorization framework for food additives is established by Regulation (EC) No 1333/2008.

For gum arabic E414 and starch sodium octenylsuccinate E1450, Commission Regulation (EU) 2026/196 should also be considered. This regulation applies from August 18, 2026, and updates the identity and purity specifications for the relevant food additives.

When reviewing E414 and E1450 for EU projects, the following should be assessed according to the specific product and food category:

• Updated controls for toxic elements;
• Microbiological requirements;
• E1450-related substituent and residual requirements;
• Whether the product is covered by applicable transitional arrangements;
• Whether additional restrictions apply to the final food category.

Regulatory identity, product specification, and permitted conditions of use in the final food should be reviewed separately. A supplier statement simply indicating “EU compliant” is not sufficient on its own.

Total Use Cost and Supply Risk

Carrier Unit Price Is Not the Same as Powder Production Cost

A more meaningful comparison is the cost per unit of acceptable powder:

Cost per unit of acceptable powder = Carrier cost + Flavor loss + Spray-drying processing cost + Loss caused by low yield + Cleaning and downtime cost + Packaging and disposal cost

Maltodextrin generally has a lower unit price, but its total cost may increase if a higher dosage or an additional emulsifier is required.

Gum arabic is more expensive, but if it increases oil loading, reduces surface oil, or decreases flavor loss, the cost per unit of effective flavor powder may not be higher.

The value of emulsifying modified starch is generally reflected in formulation standardization and industrial consistency, but its actual dosage and scale-up data still need to be verified.

Delivery Risk Should Be Assessed Together with Raw Material Source

Gum arabic is a naturally derived material, and its supply stability may be affected by sourcing regions, collection, purification, and transportation.

For emulsifying modified starch, attention should be paid to whether the production line, base starch, and modification process remain fixed.

Maltodextrin supply is generally mature, but grades produced from different base starches or with different DE values should not be assumed to be directly interchangeable.

The supply evaluation should also confirm:

• Standard lead time;
• Peak-season lead time;
• Minimum order quantity;
• Regular stock availability;
• Manufacturing site;
• Raw material source;
• Safety-stock arrangements;
• Alternative grades;
• Remaining shelf life upon arrival.

Supplier Evaluation Table

For high-value, highly volatile, or long-shelf-life products, greater internal priority should be given to flavor retention, surface oil, and batch consistency.

Ready-to-Use Procurement Checklist

Product Identity and Specifications

• The complete product name has been confirmed;
• The maltodextrin CAS number and DE range have been confirmed;
• The gum arabic CAS number, INS or E number, and botanical source have been confirmed;
• The specific modification type of the modified starch has been stated;
• The CAS number and INS or E number of E1450 have been verified;
• The base starch source has been confirmed;
• Product names are consistent across the sample, specification, COA, and package label;
• Moisture, pH, viscosity, particle size, and bulk-density ranges have been confirmed;
• Key impurities or residual parameters have been confirmed;
• Microbiological requirements are suitable for the final food application.

Test Methods

• The DE test method has been stated;
• The viscosity test concentration, temperature, equipment, and speed have been stated;
• Moisture and water-activity test methods have been defined;
• Emulsion droplet-size test conditions have been standardized;
• Total-oil and surface-oil test methods have been standardized;
• Representative compounds for flavor-retention testing have been selected;
• Data from different suppliers are generated using comparable methods.

Sample and Scale-Up Validation

• The sample comes from a formal production line;
• The sample plant is the same as the commercial production plant;
• Dissolution or hydration testing has been completed;
• Standard emulsion testing has been completed;
• Laboratory spray-drying testing has been completed;
• Pilot-scale or commercial-equipment scale-up has been completed;
• Final-formulation testing has been completed;
• Storage or accelerated-stability testing has been completed;
• Single-carrier and blended systems have been compared.

Batch and Documentation Review

• COAs from multiple production batches have been obtained;
• Variation in key physicochemical data is within an acceptable range;
• Functional application data are reproducible;
• The supplier has a formal change-notification procedure;
• COA test items are consistent with the product specification;
• The SDS or MSDS version is valid;
• The TDS or product specification matches the sample grade;
• Raw material source, allergen, and target-market declarations are complete;
• Required export documents have been confirmed.

Packaging, Supply, and Commercial Terms

• The packaging liner provides adequate moisture protection;
• The packaging can reduce odor absorption;
• Unit package weight is compatible with the feeding method;
• Storage temperature and resealing requirements after opening are clear;
• High humidity and transport with strongly odorous goods are avoided;
• Minimum order quantity has been confirmed;
• Standard and peak-season lead times have been confirmed;
• Destination and transport method have been confirmed;
• Remaining shelf life upon arrival has been confirmed;
• Payment and trade terms have been compared on a consistent basis;
• The handling procedure for nonconforming batches has been confirmed in writing;
• The need for safety stock or a second supply source has been evaluated.

ChemicalCell Support

ChemicalCell can assist in matching maltodextrin, gum arabic, and specific emulsifying modified starch grades according to the flavor type, oil content, target solids, final application, and sales market.

Relevant support may include coordination of samples and specifications, confirmation of product identity, and preparation of inquiry conditions based on purchase quantity, packaging, destination, and documentation requirements. The specific material should still be selected only after actual emulsification, spray-drying, and final-application validation.

FAQ

Can Maltodextrin Be Used Alone to Encapsulate Oil-Soluble Flavors?

In systems with a low oil content or an existing effective emulsifier, maltodextrin can be used as the main wall material.

For flavors with a higher oil content, a tendency to separate, or high volatility, maltodextrin alone generally cannot provide sufficient interfacial stability. It usually needs to be combined with gum arabic, E1450, or another emulsifying system.

Which Is More Suitable for Oil-Soluble Flavors, Gum Arabic or E1450?

Both can stabilize oil phases, but neither is universally superior for all flavors.

Gum arabic has a well-established application history in flavor emulsification, while E1450 generally offers more clearly standardized industrial specifications and batch control. The final selection should be based on comparisons of emulsion droplet size, surface oil, flavor retention, and storage stability under the same oil loading, solids content, and homogenization conditions.

Is a Lower Maltodextrin DE Always Better?

No.

A lower DE may reduce sweetness and hygroscopicity, but it may also increase feed viscosity. A higher DE usually dissolves more quickly, but it may alter powder moisture absorption, wall deposition, and storage performance.

The appropriate DE depends on the target solids content, the equipment viscosity limit, and the storage environment.

Why Can a Laboratory Emulsion Be Stable While Commercial Production Causes Wall Deposition or Increased Surface Oil?

Common causes include insufficient homogenization energy, changes in commercial solids content, feed-temperature variation, different atomization methods, excessive emulsion holding time, outlet-temperature changes, or incomplete carrier hydration.

Scale-up validation requires traceable formulation, order of addition, and emulsification conditions, followed by re-establishment of the process window on the commercial equipment.

What Is the Difference Among Surface Oil, Total Oil, and Encapsulation Efficiency?

Total oil is all detectable oil in the powder, while surface oil is oil located on or near the particle surface that can be extracted using a specified method.

Encapsulation efficiency is commonly calculated from total oil and surface oil. Lower surface oil generally helps reduce oxidation and volatilization risks, but the result should still be evaluated together with flavor-compound retention and release in the final application.

RFQ Information

The following information may be provided when submitting an inquiry:

• Carrier types to be compared;
• Complete product name and CAS number;
• Target maltodextrin DE range;
• Required gum arabic botanical source or grade;
• Specific modified starch type and INS or E number;
• Flavor type and main solubility characteristics;
• Oil-phase or active-content percentage;
• Target feed solids;
• Maximum feed viscosity allowed by the equipment;
• Target oil loading;
• Surface-oil or flavor-retention requirements;
• Final food category;
• Target sales country;
• Sample quantity;
• Estimated purchase quantity;
• Packaging specification;
• Storage and transport requirements;
• Destination;
• Required lead time;
• Payment method;
• Trade terms;
• Required COA, SDS, TDS, specification, and export documentation.

When comparing maltodextrin, gum arabic, or E1450 grades, the RFQ may also include the flavor type, oil-phase percentage, target solids, sample quantity, and sales market so that suitable raw material grades can be identified for testing.