syneresis
sih-NER-uh-sis
/sɪˈnɛrəsɪs/
The extraction or expulsion of liquid from a gel, causing the gel to contract and separate into a solid and a liquid phase.
This is a physical separation of water from a protein or starch network, commonly seen when yogurt develops a layer of watery whey on top or when scrambled eggs weep liquid.
The story behind the word. The word 'syneresis' comes from the Greek 'synairesis', which means 'a drawing together' or 'contraction'. In chemistry and food science, this refers to the protein or starch molecules in a gel drawing closer together, which squeezes out the water trapped in the spaces between them.
Word relationships
- weeping: An informal culinary term for a gel or foam releasing liquid (like meringue weeping), while syneresis is the precise scientific term.
- absorption: The process of taking in or soaking up liquid, which is the opposite of expelling it.
Commonly confused with
- condensation: Condensation is water vapor turning back into liquid on a cold surface, whereas syneresis is liquid being squeezed out from inside a gel structure.
Word family
- syneretic (adjective): Relating to or characterized by syneresis.
Collocations
- prevent syneresis
- susceptible to syneresis
- syneresis of starch gels
Example sentences
- "If you overcook custard, the egg proteins tighten too much and cause syneresis, leaving you with a watery, curdled mess." Explaining a common kitchen issue.
- "Retrogradation of starch during bread staling often leads to syneresis in starch-based puddings stored at low temperatures." A scientific paper on starch stability.
Memory hook
Think of 'sin-er-esis' as a 'sinner' squeezing a wet sponge so hard that all the water drips out. Squeezing a sponge until it weeps.
When not to use
Do not use this to describe simple evaporation or melting; it must involve a gel network releasing trapped liquid.
Fun facts
- The watery layer on top of opened yogurt is a classic example of syneresis; simply stirring it back in restores the smooth, emulsified texture.
- Adding modified starches or gums to commercial salad dressings and sour creams helps prevent syneresis, keeping the products stable on grocery shelves for months.
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