Product protection

7 layers of protection

The special layers in our long life cartons are excellent at preserving the taste and colour of your drinks, as well protecting the nutritional goodness in your product, without the need for preservatives.

So how do they do this?

Tetra Pak® cartons are mainly made from wood in the form of paperboard (about three quarters in weight), which gives stability and strength and acts as a good barrier to light. They also contain thin layers of plastic which provide water-tight barrier and sealing functions.

Our special long life cartons also contain thin layer of aluminium (which is thinner than a human hair) which makes them excellent at helping keep out harmful oxygen and acts as an extra barrier to light. This is important because exposure to light and air (oxygen) can cause food to lose its natural taste, colour, smell and nutritional value.

Protects what's good for you

So why don't you need preservatives?

The goodness of your product can be protected for up to a year because of three key steps

  • First of all your product is processed to kill all the bugs inside and ensure that it can be stored safely, either through pasteurisation for high acid products like juice and Ultra Heat Treatment (UHT) for low acid products like milk
  • The product is packed in our long life cartons, which are impervious to bacteria.
  • This is all done in very sterile conditions to make sure no new bugs can get in.
So how does light and air cause food to lose its natural taste, colour, smell and nutritional value?

Exposure to these elements can affect the goodness of your products:

oxygen

light

heat

micro organisms

Different products have varying levels of sensitivity.

What about juice?

Long life cartons help keep out harmful air (oxygen), protecting the goodness of your juice. Juice is affected by the presence of oxygen. When a half eaten apple is exposed to air... ...it turns brown, this is known as enzymatic browning due to a process called OXIDATION. (Oxidation is where oxygen is gained in a chemical reaction.)

This is how we know juice quality is affected when it is oxidised

  • Changes in colour (mainly browning)
  • Extended exposure to oxygen will speed up browning due to the oxidation of polyphenols and vitamin C → typically leading to miscolouring and losses in nutrients such as Vitamin C.
  • Changes in aroma (taste and smell)
  • Oxidation of lipids and polyphenols → typically leading to off-notes or more commonly known as funny tastes and smells.
  • Changes in nutritional value (vitamin C, B9 content)
  • Oxidative losses in the vitamins C and B9 (folic acid).

Vitamin C acts as anti-oxidant in food as well as in the human body.

So choose your juices in a Tetra Pak package to help protect the taste and goodness of your product, without the need for preservatives.

And what about milk?

Cartons, both long life and chilled, keep out the light, protecting the vitamins and natural goodness of milk.

Milk contains a rich array of vitamins and minerals that can degrade under a number of different conditions. They are particularly affected by light.

Light-induced degradation reactions in milk create a serious problem for the dairy industry because of the development of off-flavours, the decrease in nutritional quality and the severity and speed by which these phenomenon develop (Mestdagh et al. Protective Influence of Several Packaging Materials on Light Oxidation in Milk. J. Dairy Sci. 2005; 88: 499-510.)

The most sensitive nutrient to light in milk is riboflavin (vitamin B2).

When exposed to visible light it causes chemical compounds to form that are sensitive to oxygen. This leads to the oxidation of proteins and milk fat. This results in the milk tasting off and even more nutrients being lost, especially of Vitamins B2 and A.

Vitamin B2 has a number of important jobs to do, from helping keep skin, eyes, the nervous system and mucous membranes healthy, to helping produce steroids and red blood cells. It may also help the body absorb iron from the food we eat.

So choose your milk in Tetra Pak cartons to help protect it from the light and protect the goodness inside.

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