Health
Scientific Committees
Scientific Committee on Food
Outcome of discussions
Opinion of the
Scientific Committee on Food on the irradiation of eight
foodstuffs (expressed on 17.09.1998)
Terms of Reference
The Committee is asked to evaluate the
potential risks to public health arising from the treatment
with ionizing radiation of 8 foodstuffs submitted by the
authorities of a Member State in consistency with the
Committee's opinion published in its 1986 Report on the
irradiation of food(1).
Background
The Commission, in pursuance of its
objectives to propose a Directive on the approximation of
the laws of Member States concerning foods and food
ingredients treated with ionizing radiation (framework
directive) and a Directive on the establishment of a
Community list of foods and food ingredients treated with
ionizing radiation (implementing directive), has informed
the Scientific Committee for Food, that on 27.10.1997 the
Council adopted a Common Position 46/97(1) on the framework
directive proposal and a Common Position 47/97(2) on the
implementation directive proposal.
Article 4, paragraph 4, of the framework
Directive requires that until the entry into force of the
Directive which will complete the Community positive list
of the implementing Directive, Member States may maintain
existing authorisations concerning irradiated foods
provided, amongst other requirements, that the treatment
for the foodstuff concerned has been given a favourable
opinion by the Scientific Committee for Food.
Following a request from a Member State,
the Commission committed itself, that before the entry into
force of the framework Directive, it will obtain the
opinion of the Scientific Committee for Food on the
products for which treatment with ionizing radiation is
authorised in the Member State.
Introduction
In 1986 the Scientific Committee for
Food expressed its views on the irradiation of food in its
18th series of reports (3), that on the basis of all then
available evidence considered the Committee could recommend
that in the context of an overall assessment of the
wholesomeness of irradiated foods only those specific
irradiation doses and food classes should be endorsed that
were indicated as appropriate, not only from the strict
toxicological point of view, but also from the chemical,
microbiological, nutritional and technological standpoint.
The Committee listed 8 food classes and the corresponding
radiation doses submitted to it as acceptable from a public
health standpoint. The Committee believed that the health
significance of any changes which may take place in the
listed foods at the indicated radiation doses is not
different from the health significance of the changes which
are induced by heat treatment. In principle the Committee
saw no objection to considering an extension of the list to
other applications provided that appropriate information is
given for evaluation following the criteria considered in
the SCF report of 1986.
In 1992 the Committee agreed that the
treatment of Camembert cheeses manufactured from raw milk
with gamma radiation at doses up to 2.5 kGy was acceptable
from a health point of view and that therefore Camembert
cheeses manufactured from raw milk could be added to the
food classes listed for which irradiation was considered
acceptable(4).
Evaluation of the dossiers submitted
General comments:
The Committee noted that all the
dossiers submitted were of unsatisfactory quality, and did
not comply with the criteria described in the 1986 report
(1). They contained only outdated information on economic,
technological and safety aspects but no recent information
on the present situation with regard to the microbiological
quality of the marketed products and their nutritional role
in the present diet of the population of the EU. No recent
safety studies have been submitted on the irradiated
foodstuffs now requested nor do the submissions contain
sufficient information on the present nutritional role for
the European consumer in accordance with the criteria
previously considered appropriate for evaluation by the
Committee. Recent data are missing on the nutritional
quality of the macro- and microconstituents of these
irradiated foodstuffs. The description of the test methods
are frequently inadequate to evaluate the validity of the
reported results.
The Committee is aware that since
publication of its 1986 Report WHO has issued a further
review of the safety and nutritional adequacy of irradiated
food in 1992(5) which concluded that the then available
scientific literature and reports indicated that food
irradiation was a thoroughly tested food technology. Safety
studies had so far revealed no deleterious effects. In the
opinion of WHO irradiation could help ensure a safe and
more plentiful food supply by extending shelf life and by
eradicating pests and pathogens. As long as good
manufacturing practice controls were in place and
implemented, irradiation of foods was considered safe and
effective.
The Committee also noted, that in 1997,
WHO issued a further report(6) on the conclusions of a WHO
study group on high dose irradiation (above 10 kGy), which
stated that food irradiated to any dose appropriate to
achieve the intended technological objective was both safe
to consume and nutritionally adequate. Hence no upper limit
needed to be imposed for food irradiation. This WHO study
group was also of the opinion, that the application of risk
assessment in the currently accepted sense was not
appropriate to the safety assessment of foods preserved by
high dose irradiation and suggested, that in this context
the concept of substantial equivalence may be more
appropriate. It also suggested that compromising the
organoleptic properties of a foodstuff by irradiation would
automatically limit the irradiation dose which could be
applied and would then act as a guide for orientating the
technological application of food irradiation.
The Committee had no opportunity so far
to consider fully the data base on which the WHO reports of
1992 and 1997 were based. It noted, however, that the
opinions expressed in these WHO reports did not overrule
the opinions expressed in its own report of 1986.
The Committee also wishes to reemphasize
that in common with other food processes it is necessary to
follow GMP and GHP and obligatory to follow HACCP
principles when irradiation of foods is contemplated and
carried out
.
Individual evaluations:
1. Frogs' legs
The dossier (undated)(7) reports for
1985, that a considerable tonnage of frogs' legs has been
imported into Europe to satisfy consumer demand, which
could not be met by national production. The biggest hazard
arises not from the consumption of cooked frogs' legs but
from cross-infection of utensils and other foodstuffs at
the place of culinary preparation through contact with
thawed material befor
e cooking. The most important hazard arises from
contamination with
Salmonella and other faecal organisms naturally
present in frogs' legs, which cannot be removed entirely
from the raw material before being deep-frozen for export
from South Asian producing countries. As pasteurisation or
chemical decontamination cannot be applied to thawed frogs'
legs without either causing unacceptable organoleptic
changes or leaving residues of chemicals which infringe
food regulations, an alternative is the destruction of the
potentially pathogenic flora of the deep-frozen material by
irradiation with either -rays or accelerated electrons at
an average dose of 5 kGy which has been shown to be
effective for decontamination.
Some early experimental work has been
submitted to show that at this dosage no nutritionally
relevant radiolytic changes occur which are likely to cause
a toxicological hazard. A microsomal reverse mutation test
was negative on a sample of irradiated frogs' legs. The
irradiation-induced losses of vitamins are nutritionally
negligible as frogs' legs are unlikely to be a major
dietary source for them. As the dosage of irradiation
necessary is within the limits accepted as appropriate to
the treatment of foodstuffs by WHO in 1981, there is no
safety reason not to permit the decontamination of frozen
frogs' legs by irradiation up to an average maximum dose of
5 kGy.
2. Shrimps
A dossier (undated)(8) states that most
European countries have insufficient production of quick
frozen, peeled and decapitated shrimps. They therefore
satisfy their market requirements by importation
predominantly from South Asia. These imported products, by
virtue of locally existing conditions for collection,
preparation, storage and exportation in the countries of
origin do not always meet the microbiological standards set
for European producing countries. Decontamination by a
method which does not affect the organoleptic properties
and quality of shrimps is required to avoid toxic
infections of the consumer, as thawed products are often
ingested without further heat treatment. Furthermore, it is
essential that indirect contamination of the utensils and
working areas and personnel handling imported goods
contaminated with pathogens, such as
Salmonella, be avoided to prevent any outbreaks of
disease. Irradiation with doses of 5 kGy of the imported,
quick frozen, packaged products has been shown to be an
effective and technologically acceptable method of
decontamination without any toxicological or nutritionally
relevant risks, as this foodstuff is not a major source of
macro- and micronutrients in the European diet.
3. Gum arabic
Gum arabic(9), being a plant product,
produced only in tropical or subtropical areas of the
world, tends to be contaminated by sand and wood particles
by virtue of the method of its collection and preparation
for shipping abroad. Storage at the harbours before
shipping causes microbial contamination in the locally
existing humid and hot climate. When it is to be used in
pharmacy, the gum preparation must comply with the very
strict microbiological specifications of the
pharmacopoeias. There is experimental evidence that
irradiation with doses of 3 kGy will reduce the
microbiological contamination to the appropriate level for
use in foodstuffs and pharmaceutical products as specified
in AFNOR V 08-11-14. This dosage does not cause any
significant changes in the chemical composition of the gum
nor does it affect the toxicological and technological
properties to any significant extent.
4. Casein/caseinates
Microbiological analysis of acid casein,
rennet casein and caseinates(10), manufactured in
dehydrated form under European conditions has shown, that
despite good hygienic control the final products may still
contain
Enterobacter sakazakii, Escherichia coli, Salmonella
spp and
Klebsiella pneumoniae. To avoid cross- contamination
of other food products not pasteurised as a final step
before being sold to the general public, it is necessary to
decontaminate these casein products by irradiation with a
dose up to 6 kGy to avoid any incidence of toxic infection
of the consumer. At that dosage, it has been shown that no
significant chemical or physico-chemical changes occur in
casein products which would constitute a health risk
through ingestion of food products containing these
products as ingredients.
5. Egg white
The submission (11) points out that in
general the raw material may be contaminated. Treatment of
egg white, whether liquid, frozen or dehydrated with doses
up to 3 kGy assures a bacteriological quality as needed by
the food industry and avoids secondary contamination of the
decontaminated product during packaging, storage and
transport. In accepting these products the Committee is
relying on the general safety clearance of the
wholesomeness of foods, irradiated up to doses of 10 kGy,
as evaluated by the Joint FAO/IAEA/WHO Expert Committee on
the wholesomeness of irradiated food in 1981 and the
opinion expressed in the SCF report of 1986.
6. Cereal flakes
It has been demonstrated(12) that the
cereal flakes and germ intended for use as ingredients in
yoghurts made from whole milk cannot be freed from
contaminating
Bacillus spores by heat treatment. As some of the
species are pathogenic for man and can produce toxins, they
have to be eliminated from the cereal carrier before the
cereal is added to the final ingredient mixture, which is
subsequently pasteurised prior to its addition to the
yoghurt preparation. An efficient method capable of
destroying the spores of pathogenic
Bacillus species is irradiation of the cereal
ingredients with doses of 10 kGy before these are added to
the final ingredient mixture. Irradiation is therefore
acceptable in these special circumstances as an appropriate
measure to protect the health of the consumer.
7. Rice flour
For rice flour(13) used in special foods
for infants and other sensitive sections of the population,
requiring food of special microbiological quality not
achievable with normally available products, it may be
necessary to use irradiation up to 4 kGy to achieve the
desired microbiological purity of rice flour when used as
an ingredient of baby foods during their manufacture, even
though most food products involved are likely to be cooked
before consumption. Starches irradiated up to 1 kGy have
already received general clearance by the SCF in the 18th
Report. The acceptability of irradiation of legume flour is
based on the demonstration that all starches, irrespective
of their plant origin, behave similarly when irradiated in
respect of production of radiolysis products and
physico-chemical behaviour and irradiation up to 4 kGy is
acceptable.
8. Blood products
According to the submission, a
considerable tonnage of blood(14) collected from animals
killed in slaughterhouses is wasted because of its poor
initial microbiological quality due to the method of
collection and the poor hygiene conditions existing in the
small slaughterhouses which at the time of the submission
represented the majority of such premises in France. As
blood, plasma and packed cell mass, when dehydrated,
constitute a source of nutritious proteins used by the food
industry for the production of human food, some method of
decontamination is needed to reduce wastage of this protein
and to reduce costly imports of other protein sources. In
the absence of official microbiological standards, the
industry has developed its own quality standards for fresh
and dehydrated blood and its byproducts. These may be met
by the use of irradiation of prepackaged dehydrated blood
and its byproducts with doses of 5 kGy. The submission
requests however treatment with an overall average dose of
10 kGy. Chemical analysis has not revealed any significant
production of radiolytic products or loss in the
nutritional quality of the proteins in the dehydrated
products, but the use of blood as a source of bioavailable
iron has not been taken into consideration. The irradiation
dosage proposed for efficient decontamination is within the
limits established as safe treatment for the wholesomeness
of irradiated foods by the 1981 Joint FAO/WHO/IAEA Expert
Committee(15) and the Scientific Committee on Food in its
1986 report. The microbiological quality of the irradiated
products has been shown to be satisfactory by appropriate
investigations of samples taken from the production
line.
The application of doses of ionizing
radiation that would be adequate to kill bacteria would
not, of course, inactivate any contaminating viruses or
prions.
Conclusions
The Committee evaluated eight irradiated
products which have been marketed and used as food
ingredients in at least one Member State for almost 20
years without reported problems.
The Committee, in its evaluation, took
into account the general safety clearance of the
wholesomeness of foods, irradiated up to doses of 10 kGy,
as evaluated by the Joint FAO/IAEA/WHO Expert Committee in
1981. The Committee is aware that the effects of ionizing
radiation on the major components of food, e.g.: proteins,
carbohydrates, fats, minerals, and vitamins have been
investigated thoroughly and published. These data formed
the basis of the various reports on irradiated foods by
international authoritative bodies and the Scientific
Committee for Food.
In the light of the opinion expressed by
the SCF in its 1986 report
, the data now submitted and the recent developments
regarding the assessment of the safety of irradiated foods
by international authorities such as WHO, the Committee
accepts that the irradiation of these eight food products
does not pose a risk to public health. The Committee has no
objections to add the submitted 8 food items to the already
published list of acceptable irradiated food classes at the
overall average radiation doses requested in the
submissions for technological reasons.
The Committee reiterates the opinion
expressed in its 1986 report that food irradiation
technology must not be used to cover negligence in handling
foodstuffs or to mask their unsuitability for use as
food.
References
1. Council of the European Union. Common
Position (EC) No. 46/97 adopted by the Council on 27
October 1997 with a view to adopting Directive 97/
./EC of
the European Parliament and of the Council of
.. on the
approximation of the laws of the Member States concerning
foods and food ingredients treated with ionizing radiation
. Official Journal of the European Communities C 289,
22-12-97 p.36.
2. Council of the European Union. Common
Position (EC) No. 47/97 adopted by the Council on 27
October 1997 with a view to adopting Directive 97/
./EC of
the European Parliament and of the Council of
.. on the
establishment of a Community list of foods and food
ingredients treated with ionizing radiation. Official
Journal of the European Communities C 289, 22-12-97,
p.47.
3. SCF (1989) Report on the irradiation
of food. Opinion given in March 1986. 18th Series of
Reports of the Scientific Committee for Food, EUR 10840,
European Commission, Luxembourg.
4. SCF (1994). Report on irradiated
Camembert cheese. 32nd Series of Reports of the Scientific
Committee for Food, EU Commission, Luxembourg.
5. WHO (1992) Review of the Safety and
Nutritional Adequacy of Irradiated Food. WHO.
Geneva.
6. WHO (1997). Conclusions of the Joint
FAO/IAEA/WHO Study Group on High Dose Irradiation. Weekly
Epidemiological Record. 16 Jan 98, 73 rd year.
7. FICUR, (undated). La pasteurisation
par traitement ionisant des cuisses de grenouille
congelées. Unpublished dossier submitted by the French
Permanent Representation to the EU.
8. SSNCEPCS (1985). La pasteurisation
des crevettes décortiqués ou étêtées, congelées ou
surgelées par traitement au rayonnement gamma. Unpublished
dossier submitted by the French Permanent Representation to
the EU.
9. CNI (1983). Traitement par
rayonnement ionisant de la gomme arabique. Unpublished
dossier submitted by the French Permanent Representation to
the EU.
10. Besnier Proteines,Conservatome SA
(1986). La débactérisation des caséines et caseinates
alimentaires par traitement au rayonnement gamma.
Unpublished dossier submitted by the French Permanent
Representation to the EU.
11. CECAR DELAUNAY, Conservatome SA
(1984). La débactérisation des blanc d'oeuf liquide congelé
ou deshydraté par traitement au rayonnement gamma.
Unpublished dossier submitted by the French Permanent
Representation to the EU.
12. IFF (undated). Fruit et cereales sur
sucre pour yaourts, demande d'autorisation de traitement
par irradiation. Unpublished dossier submitted by the
French Permanent Representation to the EU.
13. GMFF (undated). Pasteurisation des
farines de riz et de légumineuses par traitement ionisant.
Unpublished dossier submitted by the French Permanent
Representation to the EU.
14. Europroteine SA, Van Hees,
Conservatome SA, (1984). Débactérisation de sang, plasma et
cruor deshydratés par traitement au rayonnement gamma.
Unpublished dossier submitted by the French Permanent
Representation to the EU.
15. WHO (1981). Report of a Joint
FAO/IAEA/WHO Expert Committee on the wholesomeness of
irradiated food. WHO Technical Report Series No. 659.
(1981).
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