This is of interest to you:
"Malachite green identified as an environmental contaminant": see at:
http://www.bfr.bund.de/cd/10136
Regards
Jan Verhoeven
Foodfocus.nl
--------------------------------------------------
On 11 Oct 2007 at 10:53, Sanchez, Sergio <Sergio.Sanchez@inspectorate.com> wrote:
Subject: RE: Malachite green
Date sent: Thu, 11 Oct 2007 10:53:59 -0500
From: "Sanchez, Sergio" <Sergio.Sanchez@inspectorate.com>
To: Byron Gurdián García <bgurdian@senasa.go.cr>,
<seafood@ucdavis.edu>
Dear Byron,
Not likely to get malachite green (MG) contamination from nature at those levels
(>2ppb). If this banned fungicide (notapproved to be used on food producing
animals) is not being added through the primary production of the tilapia (used to
treat ectoparasites such as gill flukes, ich and trichodina as well as bacteria and
fungal infections) and shrimp, it is most likely to come from the balanced feed
(similar to the problems with crystal violet - another banned triphenylmethane dye)
and/or environmental contamination..
Malachite green and its major metabolite, leuco-malachite green (LMG) has been reported
to have mutagenic and carcinogenic effects on humans. When malachite green is used in
aquatic animals, it will be metabolized to leuco-malachite green. The non-polar LMG has
been found to retain in catfish muscle for a longer period of them, 10 days for LMG
compared to 2.8 in MG. It has been determined that the half lives of the retention of
malachite green and leuco-malachite green in catfish muscle is 2.8 days. Therefore,
laboratory analyses must determine both MG and LMG and report results as the sum of
both.
Possible sources of contamination:
* Paper or Textile production facilities: MG is used as an industrial dye in some
manufacturing applications, including pulp and paper and textiles. Discharges
from such operations could contaminate rivers, streams and other water
bodies.
* Balanced feed: chicken meal/bone, fish meal and/orrice/soybean contaminated with
triphenylmethane dyes
* Rice/corn/soybean crops - if nearby, or alternating crops with tilapia ponds
couldbe a source of contamination
* Sterile Gloves - check the gloves used at the processing plants. Some brands will
have triphenylmethane dyes' powder.
Hope this helps.
Regards,
Sergio Sanchez
-----Original Message-----
From: owner-seafood@ucdavis.edu [mailto:owner-seafood@ucdavis.edu]On
Behalf Of Byron Gurdián García
Sent: Thursday, October 11, 2007 9:18 AM
To: seafood@ucdavis.edu
Subject: Malachite green
Dear Sefood Commnunity:
I want to know about natural sources of malachite green, if they exist.
The point is that some samples taken from St. Peter fish ponds and aquacultured shrimp
have 2 ppb of malachite green, this levels reached the MRL for this residue.
I also took samples in the river, before the ponds and after the ponds, but haven't gotten the
results.
On the other hand apparently agrochemicals used in different crops such as rice have in
their formulation malachite green.
I hope your prompt support
Byron
________________________________________________________________________
This inbound email to Inspectorate has been processed by a virus scanning service.
________________________________________________________________________
________________________________________________________________________
Visit the Inspectorate website at www.inspectorate.com
This email may contain confidential information and/or copyright
material. This email is intended for the use of the addressee only.
Any unauthorised use may be unlawful. If you receive this email
by mistake, please advise the sender immediately by using the
reply facility in your email software.
Thank you for your cooperation.
________________________________________________________________________
This archive was generated by hypermail 2b29 : Sun Oct 14 2007 - 12:31:14 PDT