Substances migrating from food packaging can be divided into two groups:
The use of natural dyes is extremely economically unjustified, for the purpose are added synthetic dyes. They are multi organic substances with nitro- and azoic-groups. In countries with strong control over the food, they are monitored especially vigilant, because of the large number of analogues, also a large number of prohibited use, but cheaper analogues, which create a serious risk of cancerous diseases, allergic reactions and worst – risk in young children. Their analysis relate the need for good equipment and specialists. They are analyzed by liquid chromatography equipped with ultraviolet and fluorescent detector.
– Migrated monomers – vinyl chloride, styrene, acrylonitrile
The migrated monomers are at all very dangerous for the health of consumers, on the one hand because of their toxicity – in some cases also carcinogenic effects, on the other hand – packaged food is an essential part of the present nutrition, which suggests a continuous load on the body. It is not accidentally that the consumers are often warned not to use multiple packs of food, because the release of monomers increases in the time.
The analysis of the monomers is associated with many difficulties, but done successfully using gas chromatograph equipped with a flame ionization and electron capture detector.
– Migrated solvents used in the manufacture of packaging, for example:
Acetaldehyde, which excretes by blowing bottles from polyethylene terephthalate, used for soft drinks and mineral water and solvents migrating from varnishes, with which are covered the packages. For the nails the problem is, when using such varnishes which aren`t insufficiently for use by the health authorities.
They are analyzed by gas chromatograph equipped with a flame ionization detector.
– Also monitored are antimony, arsenic, cadmium, chromium, lead, mercury, nickel, selenium, fluorides, cyanides, which are analyzed by atomic absorption spectrophotometry or sound inductively coupled plasma with mass detector.