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Oregon State University 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.
The research may give consumers a chance to eat longer-lasting, potentially healthier fish fillets.
“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, 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 found in oily fish like salmon, mackerel and sardines, but lean fish such as cod, grouper, catfish and swordfish have lower amounts.
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.
Eating high levels of fructose may impair memory
Washington, July 17 (ANI): Diets high in fructose – a type of sugar found in most processed foods and beverages – could impair spatial memory, says a study on adult rats.
To reach the conclusion, Amy Ross, a graduate student in the lab of Marise Parent, associate professor at Georgia State’s Neuroscience Institute and Department of Psychology, fed a group of Sprague-Dawley rats a diet where fructose represented 60 percent of calories ingested during the day.
She placed the rats in a pool of water to test their ability to learn to find a submerged platform, which allowed them to get out of the water. She then returned them to the pool two days later with no platform present to see if the rats could remember to swim to the platform’s location.
“What we discovered is that the fructose diet doesn’t affect their ability to learn,” Parent said.
“But they can’t seem to remember as well where the platform was when you take it away. They swam more randomly than rats fed a control diet,” the expert added.
Fructose, unlike another sugar, glucose, is processed almost solely by the liver, and produces an excessive amount of triglycerides – fat which get into the bloodstream. Triglycerides can interfere with insulin signaling in the brain, which plays a major role in brain cell survival and plasticity, or the ability for the brain to change based on new experiences.
Source: The Times Of India