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What is Syneresis?

syneresis in yogurtHave you opened a carton of yogurt or sour cream and found a watery layer that separated out? Some call it “weeping,” but it is technically called syneresis. Simply put, the gel lets go of some of the liquid. Why does this happen?

Foods like yogurt, sour cream, pudding, even ketchup are gels. During storage, the structure tends to contract and looses its power to hold in water. Some gels are looser when hot, but tighten up when cooled. This can also result in water loss. Gelling ingredients, such as xanthan gum, can help control syneresis, but can also result in a stiff, rubbery final product. Ice crystals on ice cream is another form of syneresis.

So don’t cry over syneresis! Shake the ketchup bottle, stir the sour cream and you’ll never know it wept!

Source: Cook’s Illustrated, February 2017

 

About Karen Blakeslee

The Rapid Response Center was formed in 1995 as a resource for Kansas State University Research & Extension Agents. Resource topics included Food Science, Human Nutrition, Food Service, Textiles, Home Care and other consumer topics. Since that time, the Center has grown to be of valuable assistance to Kansas State University Extension Specialists in those areas.
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