Milk
Learn the culinary uses, pH levels, and storage qualities of milk for everyday cooking.
Classification: Bovine lacteal secretion
pH Level: 6.5 - 6.7 (Slightly acidic)
A complex colloidal suspension of fats, protein (casein and whey), water and sugars that provides liquids and browning in recipes.
Common Culinary Roles
- ⯅Hydrates proteins and starches in baked bread and cake batters.
- ⯅Acts as the base liquid for creamy béchamels and thick custards.
- ⯅Improves crust browning via lactose caramelized sugars and Maillard reaction.
Storage Guidelines
- ▪Ensure temperature remains constantly below 40°F (4°C) to slow enzymatic spoiling.
- ▪Avoid storing in refrigerator door pockets to mitigate ambient heat spikes.
- ▪Discard milk exhibiting sour aroma or visible curd separation.
Cooking Behavior & Heat Reactions
Milk proteins (casein and whey) are heat-sensitive. Whey proteins denature above 170°F (77°C), forming a thin skin across heating surfaces (film layer). Lactose sugars under prolonged high heat undergo the Maillard cascade and caramelization, creating rich dulce de leche notes.
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Cooking Standards FAQ
Q:Why does milk curdle when combined with lemon juice or wine?
Adding acid reduces milk's pH. When it drops to 4.6 (the isoelectric point of casein), casein proteins lose their negative charges, causing them to clump together and precipitate out as curds.
Q:What's the purpose of scalding milk in recipes?
Scalding heats milk to 180°F (82°C) to denature whey proteins (specifically lactoglobulin). Active whey proteins can weaken gluten structures in yeast breads, so scalding results in a lighter, better-raising dough.
Related Kitchen Science
Why Butter Solidifies and Welts
Examining crystalline fat structures and melting parameters of lipids.
Read breakdownApplicable Kitchen Calculators
CookOrbit Recipe Scaler
Scale portions of Milk up or down without destroying baking concentrations.
Launch scaler →Milk Reference Data Citations
- U.S. Department of Agriculture—USDA FoodData Central DatabaseView Source
- Harold McGee (Scribner Books)—On Food and Cooking: The Science and Lore of the KitchenView Source
- Harvard T.H. Chan School of Public Health—Harvard Nutrition Source DatabaseView Source
CookOrbit references official food safety guidelines and established culinary science texts. Consult your local health authority for specific safety concerns.