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Cross-contamination of products can occur through these means:

  • direct – raw material and cooked material in direct contact
  • dripping – incorrect storage and packaging
  • indirect – inadequate personal hygiene or inadequate cleaning of surfaces the food contacts.

Your staff should be made aware of their responsibility to prevent cross-contamination in the workplace.

Raw material contamination

There is increased risk of the presence of food poisoning microorganisms associated with the following products

  • red meat
  • poultry
  • untreated milk
  • raw eggs
  • shellfish.

All raw food and ingredients must always be kept completely separate from ready-to-eat or cooked foods (high-risk food). Your staff should be aware that good hygiene practices must be in place to prevent any contact between raw food and cooked products; for example, the liquid from thawing foods, especially frozen poultry, must not be allowed to contaminate wiping cloths, high-risk food, or equipment used for high-risk food.

Raw materials that may contain foreign bodies, which will be undesirable in the finished product, require careful inspection prior to acceptance or must undergo specific preparation as part of the production process. For example, stones must be removed from fresh peas and fragments of walnut shells cleaned from diced walnuts.

Raw material control procedures

As a food safety manager, you should be aware of any potential chemical, physical, or biological hazards which may be present in specific raw materials. You need to have a pre-acceptance inspection system in place to assess the acceptability of raw material coming into your facility.

When you receive raw materials after the pre-acceptance inspection is done, a post-receipt inspection system must be in place to code the raw materials entering your premises so that they can be identified. This is a necessary step in preventing contamination issues later. Your traceability system should also include where and how the raw material is stored and where the raw material is eventually used.

When using raw materials, use color-coded wiping cloths and chopping boards. They are essential in preventing cross-contamination of products.

All staff must be trained in the prevention of contamination of raw material and made aware of the specific procedures in place to reduce contamination.

Product packaging

Packaging should be clean and free from contaminates such as dust. The packaging must also be stored under conditions to prevent contamination.

Indeed, packaging should be controlled in a similar way as any other raw material.

Packaging should not itself pose a hazard and should be suitable for its purpose. For example, packaging should be strong enough not to break during filling, processing, or storage.

Packaging used for the storage of raw materials is very important in preventing product contamination. There should be an appropriate barrier to prevent contact between raw materials, ingredients, and finished product.

During manufacture, any unused packaging that has been removed from its protective outer packaging should be suitably protected before being returned to storage.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
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Source:  OpenStax, Food safety knowledge network basic level requirements. OpenStax CNX. Dec 30, 2009 Download for free at http://cnx.org/content/col11142/1.4
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