Welcome to FIS   Sponsored By
Subscribe to FIS | Register with FIS | Advertise with FIS | Newsletter | About FIS | Contact us
   


Comparative test results for swordfish. (Photo: Stock File/FIS)

Fluorescent polymer detects mercury contamination in fish

Click on the flag for more information about Spain SPAIN
Saturday, February 18, 2017, 01:50 (GMT + 9)

Researchers at the University of Burgos have manufactured a fluorescent polymer, called JG25, capable of detecting the presence of mercury, in both organic and inorganic form, in fish.

According to the researchers, mercury is a toxic metal that can reach the environment from natural sources, but in recent decades its concentrations have soared in marine and land areas by industrial discharges.

In the food chain it is present diluted in organic form, as methylmercury (MeHg +), or inorganic, as the cation Hg2 +.

"The polymer contacts samples extracted directly from fish for about 20 minutes and, after being irradiated with ultraviolet light, emits a bluish light whose intensity is proportional to the amount of methylmercury and inorganic mercury present in the fish," explains lead author, Tomas Torroba.

The technique was applied by a portable polymer probe that can be used in situ, in samples of 2 grams extracted from various species.

The quantitative relationship between mercury levels in fish and the increase in fluorescence was verified with a chemical analysis (called ICP-Mass).

The results, published in Chemical Communications journal, show that larger fish have higher amounts of mercury: Between 1.0 and 2.0 parts per million in swordfish, tuna and school shark; about 0.5 ppm in conger and 0.2 ppm in pangasius, Agencia Sinc reported.

However, this harmful substance was not found in farmed salmon, since although they are fish of great size and in the upper part of the trophic chain, in captivity there is no presence of the metal.

The authors point out that the amount of mercury in fish and what a person eats determines its toxicity.

The European Food Safety Authority (EFSA) recommends that the tolerable weekly intake of methylmercury be no more than one serving containing amounts in excess of 1,6 μg/kg (micrograms per kilogram of fish) and 4 μg/Kg for the case of inorganic mercury, an amount higher than that detected.

For its part, FDA food safety agency goes further and recommends not to consume more than one serving of fish per week containing concentrations greater than 1 μg/kg.

"It is considered that above 0.5 ppm food contamination is already considerable," explains Torroba.

That amount is surpassed and even doubled by several of the analyzed samples of fresh tuna and swordfish. Hence, experts advise pregnant women to reduce the weekly consumption of certain types of fish, such as swordfish, because of the risk it could pose to the fetus.

[email protected]
www.fis.com

 

 

 


 Print


Click to know how to advertise in FIS
MORE NEWS
Canada
Apr 27, 01:30 (GMT + 9):
Federal Govt do not properly manage salmon farming, environment commissioner claims
Spain
Apr 27, 01:20 (GMT + 9):
Andalusia opens second call for aid for aquaculture projects
Spain
Apr 26, 23:10 (GMT + 9):
Research vessel starts fishery assessment survey in the western Mediterranean
Belgium
Apr 26, 23:00 (GMT + 9):
GSI restates its commitment to more sustainable salmon farming
Ecuador
Apr 26, 22:30 (GMT + 9):
Progress achieved towards integral aquaculture development
Spain
Apr 26, 21:40 (GMT + 9):
Nueva Pescanova expands capital in new aquaculture technology centre
South Africa
Apr 26, 02:50 (GMT + 9):
Sea Harvest getting closer to buy Viking Fishing assets
European Union
Apr 26, 02:30 (GMT + 9):
Spanish tuna fleet proposes the EC to implement its standard for fish imports
Belgium
Apr 26, 02:20 (GMT + 9):
New organisation to address gaps in aquaculture and fisheries certification
Spain
Apr 26, 01:40 (GMT + 9):
MARE to monitor bivalve mollusk production areas in Cantabria
Thailand
Apr 26, 01:20 (GMT + 9):
Thai Union increases stake in aquaculture feed subsidiary
Belgium
Apr 26, 01:00 (GMT + 9):
IN BRIEF - SFP announces new octopus FIP in Mauritania
China
Apr 26, 00:10 (GMT + 9):
JD.com commits to supplying BAP certified aquaculture products
Spain
Apr 25, 23:40 (GMT + 9):
Galicia would lose EUR 533 million if its fleet stops operating in Gran Sol
Chile
Apr 25, 23:30 (GMT + 9):
BioMar starts its R&D second year in ATC Patagonia



Lenguaje
FEATURED EVENTS
  
TOP STORIES
UK fishing firm to appeal against South Atlantic fishing licence decision
United States The High Court determines that a British firm will be able to appeal a controversial decision of the UK Government to hand lucrative fishing licences in the South Atlantic to foreign firms.
New attempt to unlock shrimp entry to Brazil
Argentina An Argentine delegation visited Brazil with the purpose of progressing in the negotiations for the Argentine shrimp to be commercialized again in the Brazilian market.
Over 100 kilos of eels destined to Hong Kong intercepted
Spain The Civil Guard conducted another seizure of eels that were to be illegally marketed. This time there were 113 kilos of elvers intercepted at Barajas Airport that were destined for Hong Kong.
Taiwanese fishermen argue EU imposes stricter rules due to protectionism
Taiwan Local fishermen have expressed complaints about the requirements imposed by the European Union on Taiwanese fisheries, which, in their view, are unreasonable.
 
Maruha Nichiro Corporation
Nichirei Corporation -Headquarter-
Pesquera El Golfo S.A.
Ventisqueros - Productos del Mar Ventisqueros S.A
Wärtsilä Corporation -Wartsila Group Headquarter-
ITOCHU Corporation -Headquarter-
BAADER - Nordischer Maschinenbau Rud. Baader GmbH+Co.KG (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Sea Harvest Corporation (PTY) Ltd. - Group Headquarters
I&J - Irvin & Johnson Holding Company (Pty) Ltd.
Blue Continent Products (Pty) Ltd - (Oceana Group Limited)
Pesquera San Jose S.A.
Nutreco N.V. - Head Office
CNFC China National Fisheries Corporation - Group Headquarters
W. van der Zwan & Zn. B.V.
SMMI - Sunderland Marine Mutual Insurance Co., Ltd. - Headquarters
Icicle Seafoods Inc. -Headquarter-
Starkist Seafood Co. - Headquearters
Trident Seafoods Corp.
American Seafoods Group LLC - Head Office
Marel - Group Headquarters
SalMar ASA - Group Headquarters
Sajo Industries Co., Ltd
Hansung Enterprise Co.,Ltd.
BIM - Irish Sea Fisheries Board (An Bord Iascaigh Mhara)
CEFAS - Centre for Environment, Fisheries & Aquaculture Science
COPEINCA ASA - Corporacion Pesquera Inca S.A.C.
Chun Cheng Fishery Enterprise Pte Ltd.
VASEP - Vietnam Association of Seafood Exporters & Producers
Gomes da Costa
Furuno Electric Co., Ltd. (Headquarters)
NISSUI - Nippon Suisan Kaisha, Ltd. - Group Headquarters
FAO -Food and Agriculture Organization- Fisheries and Aquaculture Department (Headquarter)
Hagoromo Foods Co., Ltd.
Koden Electronics Co., Ltd. (Headquarters)
A.P. Møller - Maersk A/S - Headquarters
BVQI - Bureau Veritas Quality International (Head Office)
UPS - United Parcel Service, Inc. - Headquarters
Hamburg Süd Group - (Headquearters)
Armadora Pereira S.A. - Group Headquarters
NOAA - National Oceanic and Atmospheric Administration (Headquarters)
Omega Protein Corporation -Headquarter-
Marona S.A.
Marine Harvest ASA - Headquarters
Marubeni Europe Plc -UK-
Findus Ltd
Icom Inc. (Headquarter)
WWF Centroamerica
Oceana Group Limited
The David and Lucile Packard Foundation
Ajinomoto Co., Inc. - Headquarters
Friosur S.A. - Headquarters
Cargill, Incorporated - Global Headquarters
Benihana Inc.
Leardini Pescados Ltda
Mitsubishi Corporation Marine Products Depts. D.Team
CJ Corporation  - Group Headquarters
Greenpeace International - The Netherlands | Headquarters
David Suzuki Foundation
Fisheries and Oceans Canada -Communications Branch-
Mitsui & Co.,Ltd - Headquarters
NOREBO Group (former Ocean Trawlers Group)
Natori Co., Ltd.
Carrefour Supermarket - Headquarters
FedEx Corporation -Headquarter-
AKBM - Aker BioMarine ASA
Seafood Choices Alliance -Headquarter-
Austevoll Seafood ASA
Walmart / Wal-Mart Stores, Inc. (Supermarket) -Headquarter-
New Japan Radio Co.Ltd (JRC) -Head Office-
Gulfstream JSC
INVE Group - Head Office
Marine Stewardship Council - MSC Worldwide Headquarters
Royal Dutch Shell plc (Headquarter)
Genki Sushi Co.,Ltd -Headquarter-
Iceland Pelagic ehf
AXA Assistance Argentina S.A.
Caterpillar Inc. - Headquarters
Tiger Brands Limited
Morpol ASA - Group Headquarters
SeaChoice
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2018 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER