howgate (phowgate@rsc.co.uk)
Wed, 2 Feb 2000 20:26:21 -0000
Michael
Do you have in mind the use of ozone as a water sterilant, as a sanitiser,
or in wash water for fish? From what I gather from the literature, ozone
does not seem to be as good a disinfectant for surfaces and equipment as
chlorine. Ozone is used in the water industry for purifying drinking water,
but the considerations in that industry are not those of the fish
processing industry. In the meat and poultry industries chlorine is used in
wash waters at very high levels, around 100 ppm, but that is intended to
reduce bacterial contamination on surfaces of the product. Such high levels
are not approved in fish processing.
To answer your specific questions as far as I am aware. Yes, ozone has been
used in the fish processing industry, though predominately on an
experimental basis, and not well documented. The Sea Fish Industry
Authority (SFIA) reports which I will refer to shortly cite: Ravesi, 1987,
Ozone treatment of fresh Atlantic cod, Marine Fisheries review, 49, (4),
37-42. I have seen the occasional paper presented to conferences about use
of ozone, and there must be internal reports from fish technology
institutes on the use of ozone in fish processing. There are two SFIA
reports I can recommend to you: SR 498, Initial trials to extend the shelf
life of cod and mackerel using sodium hypochlorite or ozone to treat ice
and refrigerated water, and SR 501, Further trials to extend the storage
life of cod and mackerel using sodium hypochlorite or ozone. The
conclusions were that neither disinfectant has any significant effect on
extending shelf life. Look at their web site http://www.seafish.co.uk. I
have no knowledge of the regulatory status of the use of ozone in fish
processing.
Peter Howgate
----------
> From: Michael Graz <michaelg@ij.co.za>
> To: 'seafood@ucdavis.edu'
> Subject: Using Ozone for Sanitation
> Date: 02 February 2000 07:54
>
> Dear Seafoods Listers
>
> There is a trend in South Africa for meat and chicken processors to use
ozone in their water and their chill rooms. Has this ever been done in the
fishing industry? Will ozone have a positive effect on fish quality? May
ozone be used in the fishing industry?
>
> Your comments will be gladly appreciated.
>
> Sincerely
>
> Michael Graz
>
>
> Michael Graz Ph.D. Pr.Sci.Nat.
> Divisional Quality Assurance Manager
> I&J Seafoods
> Cape Town
> Tel: +27 21 440 7955
> Fax: +27 21 447 4883
> Mobile: +27 82 652 2079
>
> This message is sent in confidence for the attention of the addressee
only. Unauthorised recipients are requested to preserve this
confidentiality and are requested to delete the message forthwith.
>
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