Fruit preserves

High school (ages 12+)
Food & Cooking

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/fruit-preserves

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the mechanism of microbial inhibition?High sugar concentration reduces water activity (aw) and causes osmotic stress
2. What is the key gel-forming agent?Pectin, a polysaccharide that forms a three-dimensional network
3. How does sugar help keep fruit preserves safe to eat?Sugar pulls water out of germs, making it hard for them to grow. This keeps the preserves from spoiling for a long time.
4. Why do people add lemon juice or citric acid to fruit preserves?Lemon juice makes the preserve more acidic, which also stops germs from growing. It helps keep the preserves fresh and safe.

Water Activity (aw): A measure of the unbound water available for microbial growth and chemical reactions.
Osmosis: The movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration.
Pectin: A naturally occurring polysaccharide in plant cell walls, used as a gelling agent in preserves.