Food Additives: 7 Most Common Questions About Emulsifiers, Thickeners, and Stabilizers

Photo: Adrien Olichon / Unsplash

Food emulsifiers, thickeners, and stabilizers play a key role in modern food production – from bakery products and dairy items to beverages. However, their proper selection and use often raise questions: How to ensure emulsion stability during temperature changes? Which additives are compatible with specific technological processes? And how to avoid common mistakes that could compromise the quality of the final product? This article focuses on practical answers that will help technologists and buyers avoid unnecessary complications and optimize production.

1. What are emulsifiers and how do they work in food products?

Emulsifiers are among the most commonly used food additives, whose primary role is to combine two immiscible phases – typically water and fat. In the food industry, they are used, for example, in mayonnaises, ice creams, bakery products, or chocolate coatings. Their principle lies in the fact that emulsifier molecules have both hydrophilic (water-friendly) and hydrophobic (fat-friendly) parts. This allows them to position themselves at the interface between water and fat, reducing surface tension, which enables the formation of a stable emulsion.

Among the most common emulsifiers are lecithin (naturally occurring in soy or eggs), mono- and diglycerides of fatty acids, or polyglycerol esters. The choice of a suitable emulsifier depends on the type of emulsion (oil-in-water or water-in-oil), the desired consistency, and the technological process. A properly selected emulsifier not only improves texture but also extends the shelf life of the product and prevents phase separation during storage.

2. What is the difference between thickeners and stabilizers?

Although both types of additives are often used together, their functions differ. Thickeners increase the viscosity of food products, thereby improving their consistency and texture. They work by binding water and creating a gel-like structure – typical examples include pectins in jams, carrageenan in dairy desserts, or xanthan gum in sauces. Their effectiveness depends on concentration, pH, and temperature.

Stabilizers, on the other hand, prevent undesirable changes in the product, such as sedimentation, crystallization, or phase separation. They often work synergistically with thickeners – for example, in ice cream, carrageenan stabilizes fat droplets, while guar gum thickens the mixture. The selection of an appropriate combination depends on the desired properties of the final product, such as temperature stability, freeze-thaw resistance, or resistance to acidic environments.

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3. Must food additives be declared on packaging?

Yes, all food additives, including emulsifiers, thickeners, and stabilizers, must be listed on product packaging according to EU food labeling regulations. The E-number system is used, where each additive has its unique number (for example, E322 for lecithin or E412 for guar gum). Manufacturers are required to state either the name of the additive or its E-number, or both. This allows consumers to easily identify the composition of the product and look up information about individual substances.

An exception applies only to additives that no longer serve their technological function in the final product (such as flavor carriers). Furthermore, if an additive is part of an ingredient that constitutes less than 2% of the total product weight, it does not need to be declared separately. Nevertheless, it is advisable to ensure transparency and list all additives used, so that customers have a clear understanding of the product’s composition.

4. How is the safety of food additives tested?

The safety of food additives is strictly regulated, and each substance must undergo comprehensive evaluation before being approved for use. In the European Union, this is governed by REACH regulations and the guidelines of the European Food Safety Authority (EFSA). The evaluation includes toxicological studies that examine potential health effects from long-term consumption, including tests for acute toxicity, genotoxicity, carcinogenicity, and reproductive toxicity.

An important parameter is also the determination of the Acceptable Daily Intake (ADI), which specifies the maximum amount of a substance that can be consumed daily throughout a lifetime without posing a health risk. Testing is carried out using standard test methods, and the results are independently evaluated by expert committees. Only after approval can the additive be included in the list of permitted substances and used in food production within defined limits.

Photo: Adrien Olichon / Unsplash

Which emulsifiers are most commonly used in the baking industry and why?

In the bakery industry, emulsifiers play a key role in improving the texture, volume, and shelf life of baked goods. The most commonly used include lecithins (particularly soy lecithin), mono- and diglycerides of fatty acids (E471), and esters of lactic acid with fatty acids (E481/E482). Lecithins, natural emulsifiers derived from vegetable oils, enhance fat dispersion in dough and promote even rising. Mono- and diglycerides, on the other hand, increase dough elasticity and slow down staling, thereby extending freshness.

The selection of a specific emulsifier depends on the type of product and the desired properties. For example, for fine baked goods such as croissants, combinations of emulsifiers are often used to ensure crispness and layering. For bread, the emulsifier's ability to bind water and improve crumb structure is important. When choosing, technological conditions such as processing temperature or dough pH must also be considered to ensure the emulsifier fully develops its functional properties.

How do thickeners affect the texture of dairy products and beverages?

Thickeners are essential for achieving the desired consistency in dairy products and beverages, where they directly influence viscosity, stability, and sensory properties. In yogurts and cottage cheese desserts, carrageenans (E407), pectins (E440), or starches are often used to prevent syneresis – the undesirable separation of whey. Carrageenans, extracted from red algae, form a gel structure even at low concentrations (0.01–0.1%), making them ideal for low-fat products.

In beverages such as fruit juices or plant-based milks, thickeners ensure homogeneous dispersion of particles and prevent sedimentation. Xanthan gum (E415) is popular here for its ability to create viscous solutions even at low dosages (0.05–0.2%) and its resistance to pH changes. When using thickeners, it is crucial to adhere to the optimal dosage – too high a concentration can lead to an undesirable gummy or sticky texture, while a low dose will not provide the required stability.

What factors influence the selection of stabilizers for frozen desserts?

Stabilizers in frozen desserts, such as ice creams or sorbets, serve several key functions: they prevent the formation of large ice crystals, improve creaminess, and extend shelf life. The most commonly used include guar gum (E412), carboxymethyl cellulose (E466), and alginates (E400–E404). The choice of a suitable stabilizer depends primarily on the composition of the mixture, particularly the fat and sugar content, which affect the freezing point and viscosity.

Another important factor is the technological process – for example, the freezing rate or mechanical processing during production. Guar gum is suitable for mixtures with a higher fat content, where it improves emulsion and prevents separation. Alginates, on the other hand, excel in low-fat products due to their ability to bind water and create a fine structure. When combining stabilizers, it is important to ensure their mutual compatibility and adhere to the maximum permitted limits according to EU regulations on food additives.

Do you have specific requirements for food additives?

Every raw material from GCG Group is supplied with complete technical documentation and safety data sheets in accordance with current legislation. Our experts will be happy to advise you on selecting suitable additives for your application and help ensure their trouble-free processing in production. Contact us – or browse our catalog of over 1,300 products right away.