Key Ingredients Beyond Cheese in Pasteurized Processed Cheese Products

Pasteurized processed cheese products (PCPs) are far more than just melted natural cheese. While natural cheese serves as the base ingredient – typically making up at least 51% of the final product – a range of other carefully selected ingredients are blended in during manufacturing. These additional components are what give processed cheese its smooth texture, consistent meltability, long shelf life, and the flavor consumers expect. Let’s break down each category of non-cheese ingredients and understand why they matter.

Dairy ingredients beyond natural cheese 🔗

Apart from the natural cheese base, several dairy-derived ingredients are commonly added to PCPs to adjust moisture, fat content, and protein levels. These include cream, anhydrous milkfat, butter, butteroil, skim milk, condensed milk, whey (liquid or dried), nonfat dry milk, and albumin from cheese whey. Each of these ingredients plays a specific role in meeting the required composition standards and achieving the desired body and texture.

For example, cream and anhydrous milkfat are used to increase the fat content of the product, which directly affects richness and mouthfeel. Whey solids and nonfat dry milk contribute milk proteins that can improve water-binding capacity and help create a smoother, more uniform matrix. Skim milk cheese may also be used, particularly in cheese food and cheese spread formulations where a softer body and milder flavor are desired.

These dairy ingredients are especially important in products classified as pasteurized process cheese food or pasteurized process cheese spread, where regulations allow a broader range of dairy additions compared to standard pasteurized process cheese.

Emulsifying salts: the backbone of processed cheese 🔗

If there is one group of ingredients that defines what makes processed cheese different from natural cheese, it is emulsifying salts. Despite their name, these are not emulsifiers in the traditional sense. They are more accurately described as calcium-sequestering agents – compounds that bind to the calcium that normally holds casein protein molecules together in natural cheese.

In natural cheese, calcium creates cross-links between casein proteins, forming a rigid network. When you heat natural cheese without emulsifying salts, this structure breaks down unevenly, resulting in fat separation and a lumpy, oily mess. Emulsifying salts solve this problem by displacing calcium ions from the protein network. This converts the insoluble calcium-paracaseinate into soluble sodium-paracaseinate, which can then disperse evenly, coat fat globules, and bind water – producing a smooth, homogeneous, and stable product.

Types of emulsifying salts 🔗

The U.S. FDA regulations permit a specific list of emulsifying salts in processed cheese, and these fall mainly into two chemical families: phosphate-based salts and citrate-based salts.

Phosphate-based emulsifying salts include monosodium phosphate (MSP), disodium phosphate (DSP), trisodium phosphate (TSP), tetrasodium pyrophosphate, sodium tripolyphosphate (STPP), sodium hexametaphosphate (SHMP), sodium acid pyrophosphate, and sodium aluminum phosphate (SALP). Citrate-based salts include sodium citrate, potassium citrate, and calcium citrate. Sodium potassium tartrate and sodium tartrate are also permitted.

By regulation, the total weight of emulsifying salt solids cannot exceed 3% of the finished product weight.

How different salts affect the product 🔗

Not all emulsifying salts behave the same way. The choice of salt – or combination of salts – directly influences pH, texture, meltability, and creaminess of the final product.

Short-chain phosphates like DSP and TSP are strong calcium binders and are typically used at around 2% levels. Sodium citrate and SALP bind calcium less efficiently by weight, so they are generally used at slightly higher levels, around 3%. Polyphosphates such as STPP and SHMP contribute a “creaming effect,” producing a thicker and creamier texture in the product. In high-moisture spreads and sauces, polyphosphates provide greater emulsion stability than monophosphates or citrates.

Research published in the Journal of Dairy Science has shown that the type of emulsifying salt also affects fat particle size and color – for instance, processed cheese made with trisodium citrate tends to appear whiter than those made with phosphate salts.

Strongly binding salts can lead to over-emulsification if used at high levels, so manufacturers typically blend multiple salts to achieve the exact functional properties they need. A restricted-melt cheese for applications like chicken cordon bleu, for example, would use polyphosphates like SHMP in combination with an alkaline salt to control meltability.

Acidifying agents and pH control 🔗

Controlling the pH of processed cheese is critical. The pH affects everything – from texture and sliceability to microbial safety and shelf stability. Acidifying agents are added to adjust and maintain the desired pH range, which typically falls between 5.2 and 5.8 depending on the product type.

Permitted acidifying agents include vinegar, lactic acid, citric acid, acetic acid, and phosphoric acid. These can be used individually or in combination. For pasteurized process cheese, the pH must not drop below 5.3, while for cheese spreads, a slightly lower pH (around 5.2) is acceptable and even desirable for a softer texture and enhanced spreadability.

While emulsifying salts themselves also influence pH (for instance, TSP raises pH, while MSP lowers it), acidifying agents provide manufacturers with an additional, more precise tool for fine-tuning acidity in the final product.

Preservatives and antimicrobial agents 🔗

Processed cheese products have a longer shelf life than natural cheese, and part of this stability comes from the pasteurization process itself. However, preservatives are also added – especially to consumer-sized sliced or packaged products – to prevent mold growth and inhibit dangerous pathogens like Clostridium botulinum.

Sorbic acid and sorbates 🔗

The most common mold inhibitors in processed cheese slices are sorbic acid, potassium sorbate, and sodium sorbate. According to FDA standards, these can be used at levels up to 0.2% by weight. Sorbic acid works by disrupting the enzyme systems that molds and yeasts need to reproduce. It is classified as Generally Recognized as Safe (GRAS) and is virtually tasteless and odorless, making it ideal for cheese applications.

Calcium and sodium propionates 🔗

Propionates – specifically sodium propionate and calcium propionate – are also permitted as mold inhibitors in consumer-sized packages, at levels up to 0.3% by weight. These are effective against a range of spoilage organisms and are commonly used in combination with sorbates.

Nisin 🔗

Nisin is a naturally occurring antimicrobial peptide produced by Lactococcus lactis bacteria. It is approved for use in more than 50 countries and is particularly valued in processed cheese spreads for its ability to inhibit the outgrowth of Clostridium botulinum spores. Nisin remains active even after the heat treatment involved in pasteurization, which makes it especially useful in processed cheese manufacturing. The FDA permits its use at up to 250 mg/kg in pasteurized process cheese spreads.

It is worth noting that phosphate-based emulsifying salts themselves also provide a secondary antimicrobial benefit – polyphosphates have a bacteriostatic effect that contributes to overall product safety.

Flavoring ingredients and condiments 🔗

Flavor is a key selling point of processed cheese products, and manufacturers have a wide range of options to create distinct taste profiles.

Enzyme-modified cheese (EMC) 🔗

Enzyme-modified cheese is a concentrated flavoring ingredient made by treating natural cheese with specific enzymes (lipases, proteases, or both) to intensify its flavor. EMCs deliver a powerful cheese taste at low inclusion rates, which is especially useful in cheese foods and spreads where the natural cheese content may be lower. EMC allows manufacturers to amplify flavor without increasing the proportion of expensive aged natural cheese in the formulation.

Spices, herbs, and condiments 🔗

Processed cheese products can contain spices, flavors, fruits, vegetables, and meats. These are added to create variety – think of jalapeño cheese spread, smoked cheese slices, or processed cheese with herbs. When such additions are made, the product label must identify them, for example: “Pasteurized process cheese food with jalapeño peppers.”

Other flavoring additions include salt (sodium chloride) for taste enhancement and smoke flavoring for products marketed as smoked cheese.

Colors and anti-sticking agents 🔗

The familiar golden-orange color of many processed cheese products doesn’t come from the cheese alone. Artificial or natural colors such as annatto are added to achieve a consistent, appealing appearance. Annatto, derived from the seeds of the achiote tree, is widely used in both natural and processed cheese as a natural colorant.

For sliced cheese products, lecithin is permitted as an anti-sticking agent at levels up to 0.03% by weight. This prevents individual slices from adhering to each other in the package – a small but practically important function for consumer convenience.

Stabilizers and hydrocolloids 🔗

In processed cheese spreads and sauces – products with higher moisture content – hydrocolloids and stabilizers are used to maintain the desired consistency and prevent textural defects.

Common stabilizers include carrageenan, xanthan gum, guar gum, sodium alginate, and pectins. Each of these has different functional characteristics. Sodium alginate, for instance, forms a non-thermoreversible gel in the presence of calcium and can give a glossy appearance to spreads. Pectins are useful in low-pH products like salsa-flavored spreads, where they prevent casein from dehydrating during heat treatment and developing a gritty texture.

Starches – both native and modified – are also used, particularly in cheese spreads. When combined with polyphosphates and slower cooling during production, starches can reduce the re-meltability of a spread, which may be desirable for certain food service applications.

Water 🔗

It may seem obvious, but water is a deliberate and regulated ingredient in PCPs. It is added to control moisture content, which varies by product category. Pasteurized process cheese generally has a moisture limit of around 40-43%, cheese food up to 44%, and cheese spreads between 44% and 60%. Water works together with emulsifying salts and proteins to form the stable emulsion that defines the product’s texture.

Why each ingredient matters 🔗

Every ingredient in a pasteurized processed cheese product serves a defined purpose. The dairy ingredients adjust nutrition and texture. Emulsifying salts make smooth, stable emulsification possible. Acidifying agents fine-tune pH for safety and texture. Preservatives extend shelf life and ensure safety against dangerous pathogens. Flavors and condiments create product variety. Colors ensure visual consistency. Stabilizers maintain body in high-moisture products. And water ties it all together as the medium in which the emulsion forms.

The interplay between these ingredients is what allows manufacturers to produce processed cheese with consistent quality and functionality – products that melt uniformly on a burger, spread easily from a jar, or slice cleanly for a sandwich, every single time.

What do you think? Given that emulsifying salts are the most critical non-cheese ingredient in PCPs, how might reducing sodium content in these salts (for example, by substituting with potassium-based alternatives) change the taste and texture of the processed cheese you eat? And do you think consumers fully appreciate the science that goes into making a simple cheese slice perform consistently?

References

1. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-133/subpart-B/section-133.173
2. https://www.sciencedirect.com/science/article/abs/pii/S0958694624001511
3. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-133/subpart-B/section-133.169
4. https://www.foodingredientsonline.com/doc/understanding-process-cheeses-0001
5. https://www.sciencedirect.com/science/article/pii/S0022030212004961
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC8469587/
7. https://www.sciencedirect.com/science/article/abs/pii/S095671350700223X
8. https://www.organicvalley.coop/blog/what-is-processed-cheese/
9. https://www.sciencedirect.com/topics/food-science/processed-cheese