Big Picture

Fast fact #34

#34: Jelly containing fresh pineapple, papaya and kiwi won't set as the proteases in them break down the protein gelatin in the jelly. The proteases also digest some of the proteins in your mouth and tongue when you eat these fruits, causing tingling and stinging.

Bibliography

Source: The Naked Scientists.
http://www.thenakedscientists.com/HTML/content/kitchenscience/exp/science-of-fruit-jellies/
Originally published in The Big Picture Little Book of Fast Facts
http://www.wellcome.ac.uk/Education-resources/Education-and-learning/Big-Picture/Fast-facts/index.htm

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