Eggs
Learn the culinary uses, pH levels, and storage qualities of eggs for everyday cooking.
Classification: Gallus gallus domesticus ovum
pH Level: 7.6 (Egg white) to 6.0 (Egg yolk)
A versatile biological binder, emulsifier, and leavener that acts as a structural network in sweet and savory baking.
Common Culinary Roles
- ⯅Coagulates to bind meatloaves, batters, and custom stuffing blends.
- ⯅Lecithin content emulsifies fats and waters in mayonnaise and hollandaise.
- ⯅Whisked whites trap expanding air for soufflés and sponge cakes.
Storage Guidelines
- ▪Refrigerate in their original carton at or below 40°F (4°C).
- ▪Keep on an inner shelf rather than the door where temperature fluctuates.
- ▪Do not wash intact shells before storing as it removes the protective oil layer.
Cooking Behavior & Heat Reactions
Eggs coagulate under thermal energy, turning fluid proteins into solid gels. Egg whites coagulate first around 140°F to 149°F (60°C - 65°C), while yolks set between 144°F and 158°F (62°C - 70°C). Heating too fast squeezes out moisture, yielding dry curd structures.
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Cooking Standards FAQ
Q:Why does a green-gray ring sometimes form around hard-boiled egg yolks?
This is ferrous sulfide. Boiling eggs too long or at too high a temperature causes sulfur in the white to react with iron in the yolk, creating a dark green sulfide ring. Ice water cooling halts this.
Q:How do eggs act as emulsifiers in mayonnaise?
Egg yolks contain high lecithin, a phospholipid with hydrophilic (water-binding) and lipophilic (oil-binding) ends. It anchors microscopic oil droplets in water, preventing separation.
Related Kitchen Science
Why Sauces Split and How to Rescue Them
Maintaining the microscopic suspension balance of immiscible elements.
Read breakdownWhy Cakes Sink in the Center
Understanding the balance between physical expansion and structural setting.
Read breakdownApplicable Kitchen Calculators
CookOrbit Recipe Scaler
Scale portions of Eggs up or down without destroying baking concentrations.
Launch scaler →Eggs 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.