Abstrakt:
This paper is focused on migration of substances (photoinitiators and monomers)
from formulations cured by UV radiation. The very effective and more often used
solution for study of migrating substances into foodstuff is coupling of separation
chromatographic techniques (liquid chromatography, gas chromatography) with
mass spectrometry. In this work, samples containing only monomer and
photoinitiator were cured under different conditions. After evaluation of monomer
conversion (FTIR spectroscopy) amount of substances that migrated from cured
sample into simulant (acetonitrile) by UV/VIS spectroscopy was estimated. The
tested initiators were free radical photoinitiator (1-[4-(2-hydroxyethoxy)-phenyl]-
2-hydroxy-2-methylpropan-1-on) and cationic photoinitiator (05-2,4-cyclopentadien-
1-yl)-[(1,2,3,4,5,6-h)-chlorobenzene]-Fe(II)-hexafluorophosphate). Acrylate
binder pentaerythritol triacrylate and epoxy binder (3,4-epoxycyclohexylmethyl-
3,4-epoxycyclohexane-carboxylate) were used as monomers. The study proved that
UV-VIS spectroscopy is a suitable method for analysis of simple systems consisting
of a small number of components (two or three). The disadvantage of this method is that in comparison to chromatographic methods it cannot separate and identify
a complex mixture of substances. Therefore, UV/VIS spectroscopy is not suitable
for evaluation of migrants from commercially available inks and varnishes, which
contain a large number of components (monomers, oligomers, initiators and
additives).
