Toxic Chemical in Seafood
By:
Joe Hing Kwok Chu
A family of microbial agentsanti-fungals chemical like malachite
green and gentian violet, and the antibiotics chloramphenicol and
nitrofurans are being used in farmed fish and shrimp. They are known
or suspected carcinogens.
Two methods for testing malachite green in seafood:
-
HPLC
(high performance liquid chromatography)
-
LC/MS/MS (liquid
chromatography/mass spectrometry/ mass spectrometry).
These methods involve high-sensitivity equipment, delicate
extraction processes and skilled equipment operation.
prepare a test solution from a sample, prepare
standard solutions of malachite green and inject those solutions
into HPLC or LC/MS/MS, then calculate the malachite-green content,”
he explains.
Both test methods can detect less than 1 ppb of malachite green.
HPLC takes at least six hours to complete, LC/MS/MS, at least a day.
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