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University of Victoria, British Columbia
Salal berries - an antioxidant superstar
Studies suggest that foods high in antioxidants have long-term benefits to human health, including a reduced risk of cancer, cardiovascular and neurodegenerative diseases, as well as anti-inflammatory effects.
“Salal berries may not be widely known or consumed today, but they were a staple traditional food for northwest coastal peoples, who mashed and dried them into cakes and fruit leather for winter use,” says Constabel, who studies how and why plants produce biologically active compounds.
Salal is a leathery-leafed shrub in the heather family that grows to about five feet in height. Its spring flowers are tiny fuzzy white bells. The small berries—which ripen in late summer—are a dull blue-black and are also slightly hairy. Berry flavour varies with soil and sun conditions but can be described as an earthy cross between blueberry and blackcurrant.
Five years ago, Constabel became the first in the world to reveal, at the molecular level, how blueberries ripen and produce a group of antioxidant compounds known as flavonoids. He then turned his attention to salal.
His research team—which included undergraduate student Andrew Ferguson and PhD student Gerry Gourlay, along with collaborators in Finland and Italy—measured more than 50 “phytochemical” compounds and antioxidant capacity over the course of salal fruit development. They found that salal flavonoid concentrations are the highest among common berries except highbush cranberry (a wild honeysuckle relative).
Two compounds stand out for special mention: tannins (up to five times higher than in blueberries) and anthocyanins (roughly 1.5 times higher than in blueberries).
Why do berries possess this extraordinary chemical cocktail? It certainly didn’t evolve for our benefit.
“It’s undoubtedly for the plant’s protection,” says Constabel, noting that salal berries are unusual in that they stay on the plant all winter without getting mouldy.
For more information:
University of Victoria
3800 Finnerty Road
Victoria BC V8P 5C2
Tel.: +1 250-721-7636
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