Description
Mechanical agitation destabilizes milk fat globule membranes, causing phase separation into butterfat and buttermilk.
Technical
Fat globule membranes composed of phospholipids and proteins are disrupted by shear forces, allowing triglyceride coalescence. Lactic acid bacteria (LAB) fermentation (typically Lactococcus lactis) acidifies cream to pH 4.6, promoting casein precipitation.
Culinary Significance
Develops complex fermented flavors while concentrating milk fat (80-86% vs cream's 30-40%). Cultured buttermilk byproduct serves as leavening agent.
Science
Primary Reaction
Fat globule membrane destabilization
Parameters
Temperature
14°C optimal
10°C to 18°C range
Time
25 minutes
15 minutes – 45 minutes
Equipment
Wooden plunge churn (traditional)Continuous butterworker (industrial)Thermoregulated maturation tank