Chilled fruit loses 80% of antioxidants

(Picture credit: flickr/Chotda)

Freeze-drying strawberries keeps all their Vitamin C and polyphenols and 92% of their antioxidants, saving more nutrients than by chilling.

The study was carried out by Sheffield Hallam University, UK, with frozen fruit firm Chaucer Foods.

The research measured Vitamin C, total antioxidant capacity (TAC), and total phenolic content (TPC) in fresh, chilled and freeze-dried strawberries.

Freeze-drying had no significant impact on nutrient content, but refrigerated fruit experienced large losses.

Packaging research planned

John McAughtrie, technical director, Chaucer Foods, said the research highlights the nutritional benefits of freeze-drying fruit and vegetables.

We are now planning to undertake further studies to compare the nutrient retention of freeze dried fruit and vegetables against those that have been dried using alternative technologies, and to consider the effects of packaging and storage on nutrient retention.

In the fruit chilled for seven days, TPC was reduced by 82% from fresh, Vitamin C was down by 19%, and 23% of TAC was lost.

TPC is a measure of polyphenols, chemicals with antioxidant health benefits found in fruits, vegetables, tea and wine. The largest group of polyphenols is flavonoids, which can contribute to food’s color and mouthfeel.

Dehydration technique

The study also freeze-dried lime, orange, blackcurrant, broccoli and red bell pepper, and found freeze-drying had little or no negative effect on TAC, TPC or Vitamin C content.

Freeze-drying preserves foods using a combination of cold temperature and dehydration.

Fruits and vegetables are frozen, and water is removed from the food by reducing the surrounding pressuring so the frozen water moves straight from solid to vapor.

Chaucer Foods is based in Hull, UK and has freeze-drying facilities in France and China.

Related News

Wax-Oft Birko processing

Wax on, Wax-Oft! Birko launches cleaning product

Leaf colour determines lettuce's antioxidant effect

Leaf colour determines lettuce's antioxidant effect

Can-Pacific Farms registration cancelled

CFIA cancels licence of frozen blueberry firm

Berries are the suspected vehicule of the outbreak. Picture credit: Dano/Flickr

Hepatitis A outbreak in EU linked to frozen berries

Patulin (PAT) is a mycotoxin naturally found in fruits, including apples

More than half of apple juice samples above legal patulin limit, says study

USDA role backed for cold treatment of fruit and veg

Fruit and veg to get the cold treatment

Related Products

See more related products

Submit a comment

Your comment has been saved

Post a comment

Please note that any information that you supply is protected by our Privacy and Cookie Policy. Access to all documents and request for further information are available to all users at no costs, In order to provide you with this free service, William Reed Business Media SAS does share your information with companies that have content on this site. When you access a document or request further information from this site, your information maybe shared with the owners of that document or information.