Printer Friendly

Fungal fish-oil factories.

Over the past decade, researchers have documented numerous health benefits -- including reduced risks of cancer, heart disease, and autoimmune disorders -- from fish oils rich in long-chain, omega-3 fatty acids. But many people object to the oil's fishy taste. So scientists at the Agricultural Research Service (ARS) in Philadelphia have engineered a fishless alternative: bioreactors that grow fungi rich in one of fish oil's most beneficial constituents, eicosapentaenoic acid (EPA).

In 1990, Eric W. Wessinger and his co-workers at ARS identified four species of Pythium fungi that naturally manufacture EPA. Though industrial systems can harvest such fermentation products from fungi grown in bioreactors, the strand-like structure of Pythium and other filamentous fungi precluded their efficient use in such reactors. So Dennis J. O'Brien and his ARS colleagues came up with a new design.

Most industrial fermenters grow free-floating clumps of fungus within a soup of nutrients. Key to the new ARS device is a rotating cylinder, half submerged in the fungus' nutrient soup. About a day after biochemists seed the soup with Pythium, the fungus begins locking onto the cylinder. O'Brien says the growing fungus feels like raw chicken skin and "looks similar to fibers on a paint roller." To obtain EPA, technicians periodically scrape mats of fungus off the cylinder.

Because the fungi also feed on whey, a by-product of cheese-making, the process may even provide dairy farmers a market for a waste they currently pay to get rid of, adds Wessinger, now with A.E. Staley Manufacturing Co. in Decatur, Ill.
COPYRIGHT 1992 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1992, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:engineered eicosapentaenoic acid
Publication:Science News
Article Type:Brief Article
Date:Aug 15, 1992
Words:252
Previous Article:Public unaware of water problems.
Next Article:Colliding positrons, polarized electrons.
Topics:


Related Articles
A fish - oil - story.
Fish oil: fad or find?
Prairie dogs and gallstone formation.
Fish oil slows some developing cancers.
Can fish oil prolong pregnancy?
Study probes potential health benefits of DHA.
The beat goes on.
Nutrition hotline: this issue's nutrition hotline concerns whether consuming fish benefits the heart and, if so, what that means for vegetarians and...
In a heartbeat.

Terms of use | Copyright © 2017 Farlex, Inc. | Feedback | For webmasters