How does pectin make jam set?

mummytait | 14:01 Sat 25th Nov 2006 | Food & Drink

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I made tomato jam but it wouldn't set until I added the pectin, how does that work?

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Pectin's molecular structure looks like a chain with spikes sticking out. When these chains contact fruit acid in a jelly mixture, the acid charges the spikes, causing the pectin chains to fold in on themselves and trap water to form a gel. (Source Sunset Magazine)

mummytait

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Lovely answer and exactly what I needed to know. Thanks very much x

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