What is actually in milk
Milk carries protein, fat, lactose, minerals and water. For cheesemaking the important structure is the casein micelle — a cluster of proteins held in suspension, with kappa-casein on the outside keeping neighbouring micelles from sticking.
Two routes to a curd
| Route | How it works | Typical cheeses |
|---|---|---|
| Enzymatic | Clotting enzymes cleave kappa-casein; micelles aggregate | Most rennet-set cheeses |
| Acid | Falling pH neutralises the charge holding micelles apart | Fresh acid-set cheeses |
| Acid + heat | Heat plus acid precipitates protein directly | Some fresh Latin American styles |
The six levers you actually control
- Milk composition and heat treatment.
- Temperature at addition and through the set.
- pH at addition.
- Available calcium.
- Coagulant type and dosage.
- Time — how long you let the gel develop before cutting.
Coagulation is never controlled by one variable. Milk composition, temperature, pH, calcium, the cheese style and your process conditions all shape how the curd forms — the coagulant is one input among several.
About the author
Bixa Products — Editorial team
Educational content written by the Bixa Products team, a family-owned cheesemaking ingredient company specializing in rennet and chymosin. Technical guidance is written conservatively: where a value depends on your milk, process or product, we say so instead of guessing for you.
- Family-owned cheesemaking ingredient company
- 30+ years in the Latin American cheesemaking market
- Specialists in rennet, chymosin and milk coagulation