How to Choose and Use Food Emulsifiers Correctly

Photo: Yimeng Zhao / Unsplash

Emulsifiers play an indispensable role in the food industry – they ensure emulsion stability, improve texture, and extend the shelf life of products. From mayonnaise and sauces to bakery products and dairy desserts, their correct selection and use determine the quality of the final product. Nevertheless, manufacturers often face issues such as phase separation, undesirable changes in taste, or insufficient stability during storage. This guide will help you avoid common mistakes and optimize formulations with respect to technological and legislative requirements.

1. Basic principles of emulsifiers and their role in food production

Emulsifiers are surfactants that enable a stable mixture of two or more immiscible phases, typically water and oil. In the food industry, they play a key role in the production of margarines, mayonnaises, ice creams, bakery products, or dairy beverages. Their effectiveness lies in their ability to reduce surface tension between phases, thereby preventing the separation of components and extending the shelf life of the product. Emulsifiers are divided into natural (e.g., lecithin from eggs or soy) and synthetic (e.g., mono- and diglycerides of fatty acids), with the choice depending on the desired function, cost, and legislative restrictions.

In practice, emulsifiers are used not only to stabilize emulsions but also to improve texture, volume, or dough processability. For example, in baking, they increase gluten elasticity; in confectionery, they prevent sugar crystallization; and in dairy products, they improve consistency. When selecting an emulsifier, it is necessary to consider not only technological properties but also interactions with other ingredients, such as thickeners or preservatives. It is also important to adhere to the recommended dosage, which typically ranges from 0.1–2% of the total product weight.

2. How to choose the right emulsifier for a specific application

The selection of an emulsifier begins with an analysis of the final product’s requirements. For water-in-oil emulsions (e.g., mayonnaises), emulsifiers with a higher hydrophilic-lipophilic balance (HLB), such as polysorbates or lecithin, are suitable. Conversely, for oil-in-water systems (e.g., margarines), mono- and diglycerides or fatty acid esters are more commonly used. Another important factor is the pH of the environment—some emulsifiers lose effectiveness in acidic or alkaline conditions, which must be tested before implementation in production.

Another key criterion is thermal stability. For example, in the production of chocolate or bakery products, the emulsifier must withstand high temperatures without degrading. In such cases, emulsifiers based on lecithin or polyglycerol esters are proven effective. For low-fat products where creaminess is crucial, emulsifiers are often combined with hydrocolloids (e.g., carrageenan). Before final selection, it is advisable to conduct laboratory tests with small samples to verify compatibility with all recipe components.

Photo: Richard R / Unsplash

3. Practical steps for correct emulsifier dosage and application

Proper dosing of the emulsifier is crucial for achieving the desired product properties. Generally, a dose that is too low will not provide sufficient stability, while a dose that is too high may lead to undesirable sensory properties, such as bitterness or a greasy mouthfeel. The recommended dosage typically ranges between 0.1–2% of the product's weight, but the exact amount depends on the type of emulsifier and the application. For example, 0.5–1% lecithin is often used to stabilize mayonnaise, whereas up to 2% mono- and diglycerides may be required in bakery products.

Emulsifiers are added to the mixture gradually and under controlled conditions. In the case of powdered emulsifiers, it is important to first disperse them in one of the phases (e.g., in oil or water) and only then add them to the main mixture. For liquid emulsifiers, ensuring even distribution through stirring or homogenization is key. The temperature during application should be optimized—some emulsifiers require higher temperatures for activation (e.g., 60–70 °C), while others are effective even when cold. After application, it is advisable to conduct stability tests, such as centrifugation or storage at various temperatures.

4. Legislative Requirements and Safety Aspects of Using Emulsifiers

The use of emulsifiers in the food industry is subject to strict legislative regulations, particularly the EU regulations on food additives (e.g., Regulation (EC) No 1333/2008 of the European Parliament and of the Council). Each emulsifier must be approved for a specific food category, and its use must be indicated on the product packaging under the relevant E-number (e.g., E322 for lecithin). Manufacturers are obliged to comply with maximum permitted levels and ensure that emulsifiers meet purity requirements according to applicable standards.

The safety of emulsifiers is regularly reviewed by scientific institutions such as the European Food Safety Authority (EFSA). When handling emulsifiers, it is essential to follow safe work practices, including the use of personal protective equipment (gloves, safety goggles) and ensuring adequate ventilation. Emulsifiers should be stored in a cool, dry place to prevent degradation or contamination. If there are any doubts about compatibility or safety, it is advisable to consult a technical specialist or raw material supplier, who can provide up-to-date technical data sheets and safety data sheets (SDS).

Photo: Adrien Olichon / Unsplash

Optimising Emulsion Stability: Technological Processes and Common Challenges

Emulsion stability is a key factor for the quality and shelf life of food products. To achieve optimal stability, it is necessary to consider not only the type of emulsifier but also the technological production conditions. The most important parameters include homogenization pressure, temperature, and mixing time. For example, in mayonnaise production, it is recommended to gradually add the oil phase to the aqueous phase under intensive mixing to prevent droplet coalescence. For dairy products such as yogurts or creams, it is advisable to add the emulsifier at temperatures around 60–70 °C, when its effectiveness is highest.

A common problem in emulsion production is phase separation, which can be caused by insufficient emulsifier dosage, unsuitable pH conditions, or mechanical stress during storage. To minimize these risks, it is advisable to conduct stability tests under various temperatures and storage conditions. Standard testing methods can monitor emulsion particle size, viscosity, and sedimentation. In cases of instability, combining emulsifiers with different HLB values or adding stabilizers such as thickeners or hydrocolloids may be considered.

Interactions of Emulsifiers with Other Components in Food Formulations

Emulsifiers do not function in isolation—their effectiveness is significantly influenced by interactions with other formulation components. For example, the presence of salt can affect the solubility of the emulsifier and its ability to form stable micelles. In the case of proteins such as casein or whey proteins, competitive adsorption at the oil-water interface may occur, which can either support or disrupt emulsion stability. For products with a high sugar content, such as icings or creams, it is important to ensure the compatibility of the emulsifier with sugar solutions to prevent crystallization or texture changes.

When developing new formulations, it is therefore essential to test emulsifiers in combination with other ingredients. It is recommended to proceed systematically: first verify the stability of the emulsion with the emulsifier alone, then gradually add other ingredients and monitor changes in texture, viscosity, and appearance. For more complex systems, such as bakery products or beverages, it may be necessary to adjust not only the emulsifier dosage but also technological parameters, such as temperature or processing time.

Innovations in Emulsifiers: Trends and Sustainable Alternatives

The food emulsifier market is undergoing dynamic development, with a key trend being the search for sustainable and natural alternatives to synthetic emulsifiers. Among the most promising natural emulsifiers are lecithin from plant sources (e.g., soy or sunflower), proteins from legumes, or polysaccharides such as gum arabic. These substances not only meet clean label requirements but often also exhibit additional functional properties, such as improved texture or extended shelf life.

Another direction of innovation is the development of emulsifiers with targeted properties, for example, for low-fat or gluten-free products. In these cases, it is often necessary to combine multiple types of emulsifiers or add other functional ingredients, such as thickeners or stabilizers. Manufacturers are also increasingly using microencapsulation of emulsifiers, which allows for their gradual release during processing or storage, thereby enhancing their effectiveness and stability in the final product.

Need help selecting emulsifiers?

Every food ingredient requires an individual approach. GCG Group provides detailed technical data sheets and safety data sheets (SDS) for each emulsifier, and our experts will be happy to advise you on selection and application based on the specific needs of your production. Contact us – or browse our catalogue of over 1,300 products right away.