Featured Research

from universities, journals, and other organizations

Edible Coating Makes Fish Fillets Longer-lasting, Healthier

Date:
July 20, 2009
Source:
Oregon State University
Summary:
Consumers may soon be able to eat longer-lasting, potentially healthier fish filets. Scientists have extended the shelf life of lingcod fillets and made them more nutritious by dipping them into an edible, protective coating enriched with fish oil.

Oregon State University's Jingyun Duan (left) and Yanyun Zhao show off a liquid coating into which they've dipped lingcod fillets to make them longer-lasting and possibly healthier.
Credit: Photo by Lynn Ketchum

Consumers may be able to eat longer-lasting, potentially healthier fish fillets if research at Oregon State University makes its way to the supermarket.

That's because OSU scientists have extended the shelf life of lingcod fillets and possibly made them more nutritious by dipping them into an edible, protective coating enriched with fish oil.

"With this coating, you can easily keep the fillets in the display case for two to three more days," said OSU food science professor Yanyun Zhao, the lead researcher in the study.

The liquid coating contained chitosan, which comes from crustacean shells and can be made into film for food wrapping to keep out bacteria and fungi and prolong storage life. What's unusual about the OSU study is that fish oil was added to the chitosan coating, which wasn't visible once it dried. After the coating was applied, some fillets were refrigerated for three weeks while others were frozen for three months.

The study, which has been accepted for publication in the journal Food Chemistry and has been published on its Web site, found that the coating tripled the omega-3 fatty acids in the refrigerated and frozen fish when compared against the uncoated fish.

Omega-3 fatty acids are essential nutrients, and research suggests that increasing them may have a number of health benefits. The U.S. Food and Drug Administration says specific ones may reduce the risk of coronary heart disease. But questions still remain about how these fatty acids might prevent or treat certain diseases.

Omega-3 fatty acids are found in oily fish like salmon, mackerel and sardines, but lean fish such as cod, grouper, catfish and swordfish have lower amounts. Lingcod was chosen for the study because it's a popular fish on the West Coast and doesn't have much fat.

In addition to increasing the omega-3 levels in the lingcod, the OSU study also found that the coating reduced lipid oxidation, which causes rancidity, in the refrigerated and frozen samples when compared with the uncoated fillets. The coating also kept the fish moister than the uncoated samples as the frozen ones were thawing. Additionally, the coating delayed the growth of microorganisms in the fresh fillets, and it prevented their growth in the frozen ones. The coating did not affect the color of the fillets.

The study, which was conducted with help from OSU postdoctoral research associate Jingyun Duan and associate professor Gita Cherian, was funded by the Oregon Innovation Council through the Community Seafood Initiative.


Story Source:

The above story is based on materials provided by Oregon State University. Note: Materials may be edited for content and length.


Cite This Page:

Oregon State University. "Edible Coating Makes Fish Fillets Longer-lasting, Healthier." ScienceDaily. ScienceDaily, 20 July 2009. <www.sciencedaily.com/releases/2009/07/090716164346.htm>.
Oregon State University. (2009, July 20). Edible Coating Makes Fish Fillets Longer-lasting, Healthier. ScienceDaily. Retrieved August 30, 2014 from www.sciencedaily.com/releases/2009/07/090716164346.htm
Oregon State University. "Edible Coating Makes Fish Fillets Longer-lasting, Healthier." ScienceDaily. www.sciencedaily.com/releases/2009/07/090716164346.htm (accessed August 30, 2014).

Share This




More Plants & Animals News

Saturday, August 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) Video provided by AP
Powered by NewsLook.com
Raw: Australian Sheep Gets Long Overdue Haircut

Raw: Australian Sheep Gets Long Overdue Haircut

AP (Aug. 28, 2014) Hoping to break the record for world's wooliest, Shaun the sheep came up 10 pounds shy with his fleece weighing over 50 pounds after being shorn for the first time in years. (Aug. 28) Video provided by AP
Powered by NewsLook.com
Minds Blown: Scientists Develop Fish That Walk On Land

Minds Blown: Scientists Develop Fish That Walk On Land

Newsy (Aug. 28, 2014) Canadian scientists looking into the very first land animals took a fish out of water and forced it to walk. Video provided by Newsy
Powered by NewsLook.com
Huge Ancient Wine Cellar Found In Israel

Huge Ancient Wine Cellar Found In Israel

Newsy (Aug. 28, 2014) An international team uncovered a large ancient wine celler that likely belonged to a Cannonite ruler. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins