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New method shows mushrooms a top source for one antioxidant

e buttons. A standard 3-ounce USDA serving of these mushrooms, about the amount you'd put on a cheese steak or mushroom-topped burger, supplies up to 5 milligrams.

The exotic mushrooms have even more ergothioneine. The same standard serving size of shiitake, oyster, king oyster or maitake (hen of the woods) can contain up to 13mg in a 3-ounce serving or about 40 times as much as wheat germ.

Dubost notes that the levels of ergothioneine do not decrease when the mushrooms are cooked.

In developing their new assay, the researchers adapted an assay used to quantify the amount of ergothioneine in bovine ocular tissue. They used high performance liquid chromatography (HPLC), a UV-VIS detector and mass spectroscopy, instruments normally used in analytical chemistry.


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Contact: Barbara Hale
bah@psu.edu
814-865-9481
Penn State
31-Aug-2005


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