Powder or Liquid? Choosing the Right Nanoemulsion Format for Your Product Line

There is no universally better nanoemulsion format. The right choice depends on the finished product, manufacturing process, stability requirements, and consumer use. 

A liquid nanoemulsion may fit a product built around liquid ingredients, while a powdered format may suit dry blends, sachets, and stick packs. For dry applications, water-soluble powdered nanoemulsions can be evaluated as a dry ingredient format for incorporation into suitable aqueous products.

Nanoemulsions are being studied as delivery systems for functional ingredients that can be difficult to incorporate into conventional formulations. 

Recent research reviews their applications across food, nutraceutical,l and pharmaceutical delivery and examines factors such as solubility, stability, bioavailability, ty and formulation design. 

How Do Liquid and Powdered Nanoemulsions Differ?

A nanoemulsion is a colloidal system made from small droplets dispersed within another liquid phase. The format decision comes later. 

A liquid nanoemulsion remains in a liquid system, while a powdered format requires the liquid system to undergo a drying process.

Which Nanoemulsion Format Fits Your Product?

Start with the finished product architecture, rather than choosing the delivery format first. A liquid format may be worth evaluating when:

• The finished product is a ready-to-drink beverage.
• The manufacturing process already accommodates liquid ingredients.
• The active needs to be incorporated into an aqueous formulation.
• The product does not require a dry ingredient.

Nanoemulsions are being investigated for functional food and nutraceutical applications because their formulation can help incorporate poorly water-soluble compounds into aqueous systems. A powdered format may be worth evaluating when:

• The finished product is a powder drink.
• The product is packaged in sachets or stick packs.
• The manufacturing process relies on dry blending.
• The consumer mixes the product with water before consumption.

For a water-soluble powder supplement ingredient, the development process should consider how the powder behaves during blending, filling, storage, and eventual reconstitution.

This is particularly relevant to a stick pack formulation, where the powder format needs to align with the intended manufacturing and packaging process.

What should you assess after reconstitution?

If a powdered product will be mixed with water, development teams should evaluate:

• Dispersion time.
• Visual appearance.
• Sedimentation.
• Reconstitution consistency.
• Stability after reconstitution.

The ability of a dried delivery system to redisperse can depend on the drying process and formulation composition, so this should be evaluated for the specific product rather than assumed from the physical format alone. 

What Should You Evaluate Before Choosing a Nanoemulsion Format?

1. What is the final product format?

First define the finished product:

• Beverage.
• Powder drink.
• Sachet.
• Stick pack.
• Capsule.
• Tablet.
• Other dry or liquid formulation.

The intended application can influence nanoemulsion composition, preparation method, and required product characteristics.

2. What stability requirements apply?

Nanoemulsion stability can be affected by factors such as temperature, pH, ionic strength, droplet characteristics, and formulation composition. Research also identifies physical changes such as flocculation, coalescence, creaming, and Ostwald ripening as relevant stability considerations. For development, consider:

• Physical stability.
• Chemical stability.
• Processing exposure.
• Storage conditions.
• Final-product stability.

3. How will the liquid system become a powder?

If a dry format is required, drying becomes part of the formulation strategy. A spray-dried nanoemulsion can be produced by drying a nanoemulsion-containing feed. The process should be evaluated for its impact on powder properties, active retention, and subsequent redispersion.

Recent research on advanced delivery systems continues to examine how processing and material selection affect the stability and performance of nutraceutical delivery systems.  Before selecting the process, ask:

• Does the resulting powder meet the required specifications?
• Does it redisperse appropriately?
• Is it compatible with the intended manufacturing process?
• Can the process be scaled while maintaining those specifications?

4. What packaging and storage conditions are required?

The packaging strategy should match the physical format and formulation requirements. For liquid products, consider:

• Physical stability.
• Container compatibility.
• Temperature exposure.
• Storage conditions.

For powder products, consider:

• Moisture exposure.
• Powder flow.
• Filling consistency.
• Packaging protection.
• Storage conditions.

These factors should be evaluated against the specific formulation because nanoemulsion characteristics can change in response to environmental and formulation conditions. 

5. How will the consumer use the product?

Consumer use should be considered before finalizing the format. Ask:

• Is the product consumed as supplied?
• Does the consumer need to mix it with water?
• Is single-serve dosing important?
• Does the product need to fit an existing dry or liquid routine?

A liquid format may align naturally with a ready-to-drink product. A powder may fit more naturally when the finished product is supplied as a sachet, stick pack, or dry supplement that is mixed before consumption.

Closing Thoughts

Choosing between a liquid and powdered nanoemulsion is not about assuming one format has better performance. The appropriate choice depends on the specific formulation, processing method, packaging requirements, and intended application.

A liquid format may make sense when direct incorporation into a suitable liquid system fits the manufacturing process. A powder may be more appropriate when the product requires a dry ingredient for a sachet, stick pack, or other dry format.

The best format is the one that fits the complete product pathway, from formulation development and manufacturing to storage and final use.