What Makes Jam Set?

Without a carbohydrate called pectin, jam would just be sweet fruit juice and jelly beans would be colourful piles of sugary powder. Pectin is found in the cell walls of all plants, and is present in higher levels in certain fruit, such as apples and citrus fruits, with most pectin located under the peel. It is broken down as fruit ripens, leading to softer fruit. Pectin makes up 0.4% of a cherry’s weight, 1% of an apple’s, and 30% of citrus peel’s.

Jam making involves the stewing of fruit a more here http://logicalscience.com/2016/10/what-makes-jam-set/

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