Dairy & Alternatives

Material selection for dairy & alternatives

Phosphates, citrates, calcium sources and hydrocolloids for dairy products and plant-based alternatives, including creamers, drinks, processed cheese and desserts. The core challenge is keeping proteins and fats stable through heat treatment and storage while delivering the expected mouthfeel and mineral content.

What the application needs. Dipotassium phosphate (E340) and disodium phosphate (E339) are the classic buffers in coffee creamers and plant-based drinks, stopping protein feathering when the product meets hot, acidic coffee and helping the drink survive UHT processing. Sodium citrate (E331) and sodium hexametaphosphate (E452) bind calcium, disperse proteins and prevent gelation and sediment during storage, and they are the key emulsifying salts in processed cheese, where they convert insoluble caseinate into a smooth, meltable mass. Tetrasodium pyrophosphate (E450) is used in instant puddings and desserts for setting. For calcium fortification of plant-based milks, tricalcium phosphate (E341) is widely used because its low solubility avoids destabilising the protein, although it needs a fine particle size and a suspending agent such as gellan or xanthan gum to stay in suspension. Xanthan gum also adds body to reduced-fat products, and maltodextrin and glucose syrup contribute solids and sweetness.

Key specification parameters. Phosphates are specified by assay, P2O5 content and the pH of a 1% solution, together with fluoride, arsenic and heavy-metal limits under the E-number purity criteria. For tricalcium phosphate used in fortification, agree the calcium content and particle-size distribution, because coarse particles settle quickly. For sodium citrate, agree assay and whether you need the dihydrate or anhydrous form. For hydrocolloids, agree viscosity at a stated concentration and mesh size. For plant-based products, also document allergen status, since soy, oat, nut and pea bases carry different allergen and gluten considerations, and confirm vegan status for every ingredient; gelatine, for example, is not suitable for vegan products.

Recommended product types. An oat or soy barista drink typically combines dipotassium phosphate as the buffer with a small amount of a hydrocolloid, plus tricalcium phosphate for calcium where fortification is claimed. Processed cheese uses a blend of emulsifying salts, commonly sodium citrate and phosphates, balanced for melt and slice. Dairy desserts use phosphates or citrates to control gelation, with starch or hydrocolloids for texture.

Handling notes. Dose phosphates and citrates on a trial basis, because small changes shift pH, viscosity and heat stability. Dissolve buffer salts before adding protein, and disperse hydrocolloids under high shear or pre-blended with sugar to avoid lumps. Phosphates and citrates are hygroscopic, so reseal bags. Permitted uses and levels for phosphates in dairy products are set in Annex II of Regulation (EC) No 1333/2008 and its UK retained equivalent, often as a group limit expressed as P2O5, so check the current annex for your category. Request specifications, certificates of analysis, allergen and GMO statements, and the certificate scope for any certification you need.