Chemical Screening
Laboratory chromatographs for food contact paperboard measure the migration potential of mineral oil saturated hydrocarbons and mineral oil aromatic hydrocarbons. MOSH MOAH testing quantifies these chemical residues that originate from recycled newspaper inks and board manufacturing processes. This analysis ensures that food packaging complies with regional safety standards, protecting food from absorbing toxic oils.
The testing relies on liquid chromatography coupled with gas chromatography, and its applicability is restricted to paperboards with low polymer barrier layers.
Analytical Process
The analysis begins with the extraction of mineral oils from the board using an organic solvent like hexane or ethanol. In MOSH MOAH testing, the extracted solution is separated into two fractions that are subsequently analyzed by gas chromatography to determine their hydrocarbon chain length. This procedure detects the presence of light and heavy mineral oils, which can indicate if the source is printing ink or lubricating oil from the mill.
This differentiation helps manufacturers reformulate their adhesive or ink systems to reduce contamination.
Food Protection
Minimizing these hydrocarbons prevents their transfer into dry foods like flour or cereals during storage. This testing is essential for verifying the performance of functional barrier coatings used on recycled board. A passing result on this test allows the board to be used safely for direct food contact.
