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🥚 Eggs: the most versatile molecule in cooking

One egg can set a custard, lift a souffle, hold mayonnaise together and glaze a pastry. Protein unfolding explains all four.

5
lessons
~30 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. What is actually inside the shellDescribe the physical structure and composition of an egg and explain why the white and yolk behave as two different ingredients.An egg is a porous mineral shell around a watery protein solution and a fat-rich yolk, and the variety of proteins in the white is what makes the egg so versatile.
  2. Heat: the one dial that does everythingExplain denaturation and coagulation and predict how temperature and dilution change the result.Heat unfolds egg proteins and they bond into a water-holding mesh; too much heat tightens that mesh and wrings the water back out.
  3. Foam: how a liquid holds airExplain how whipping denatures protein at the air-water interface and why fat, acid, copper and sugar change the result.A foam is air wrapped in a film of unfolded protein: fat prevents the film forming, acid and copper toughen it, and sugar slows it down while making it last.
  4. Emulsion: holding oil and water togetherExplain how yolk emulsifiers stabilise oil droplets in water and why technique determines whether the sauce holds.Yolk phospholipids coat each oil droplet so they cannot merge; slow addition keeps every droplet covered, and a broken sauce can be rebuilt rather than thrown away.
  5. Everything else an egg doesApply egg chemistry to thickening, binding, glazing and ageing, and identify the practical consequences of each.Starch protects egg proteins from curdling, egg protein glues and glazes and leavens, and an egg's slow loss of carbon dioxide is why older eggs peel more easily.

Questions this course answers

Why can you cook an egg so that the yolk is thick but the white is still loose?

White begins thickening around 62 °C and firms by about 65; yolk moves to a custard texture around 65. Holding an egg in that narrow band gives a set yolk inside a barely-set white.

Why does a speck of yolk stop egg whites from whipping?

A foam depends on unfolded proteins bonding into a continuous skin at each bubble's surface. Fat inserts itself between them and prevents that skin forming.

Put the stages of whipping egg white into a meringue in order

Whipping is mechanical denaturation: it does to the proteins what heat does, and the resulting film is what holds the air in place.

At roughly what temperature is a plain egg white fully set?

About 65 °C. It begins turning cloudy near 62 and is firm a few degrees later — well below boiling, which is why gentle heat is enough and hard boiling is overkill.

Match each part of making mayonnaise to what it is physically doing

An emulsion is not a chemical change: it is a physical arrangement of coated droplets, and every technique in the recipe protects that arrangement.

Complete the sentence about what heat does to egg protein

Denaturation is the unfolding; coagulation is the bonding that follows. Whisking causes the same unfolding by mechanical force rather than heat.

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