The Asian diet traditionally includes lots of raw fish and shellfish, and diners and restaurateurs are aware of the risks of food poisoning posed by contaminating bacteria.
In Korea between 2003 and 2006 around 12% of food poisoning cases were due to a type of bacteria called Vibrio, whose family includes the microbe that causes cholera. Now Korean scientists have come up with a simple and effective way of making sure that shellfish is safe - put a brass plate at the bottom of the fish tank.
"We showed that copper ions diffuse out from a brass plate into a fish tank filled with seawater, and within 40 hours the copper killed 99.99% of the Vibrio food poisoning bacteria contaminating the living fish and shellfish," says Dr Jeong-Weon Huh from the Department of Health Research, at Gyeonggi-do Institute of Health and Environment, Republic of Korea.
The copper is absorbed by the bacteria, causing them to die and fall off the gills and skin of the fish. Vibrio are even flushed from the internal organs of the fresh fish, sinking to the bottom of the tank. The remaining copper ions are absorbed from the seawater in the tank by sand and polyester filters, leaving safe, clean fish ready to be eaten by restaurant diners.
"By being able to remove the copper ions, we can prevent people from consuming excess copper themselves, but let them safely enjoy any kind of fish, either raw or cooked," says Dr Jeong-Weon Huh.
Koreans have claimed for a long time that food served in a traditional bowl called a bangzza is safer to eat. Now the food researchers have proved the science behind the myth. The 78% copper and 22% tin mixture used to make the traditional bangzza kitchenware allows enough copper ions to escape into the food that pathogenic microbes are rendered harmless.
In countries with many people suffering from poor sanitation and hygiene, where cholera and other Vibrio bacteria are rife, it seems that this traditional cookware may be a lifesaver.
"We highly recommend that brass is used in restaurant fish tanks for consumer's safety. More people will be able to safely enjoy seafood, and the marine dealers will have a stable income," says Dr Jeong-Weon Huh.
Lucy Goodchild | alfa
The balancing act: An enzyme that links endocytosis to membrane recycling
07.12.2016 | National Centre for Biological Sciences
Transforming plant cells from generalists to specialists
07.12.2016 | Duke University
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
07.12.2016 | Health and Medicine
07.12.2016 | Life Sciences
07.12.2016 | Health and Medicine