Paperboard Hydrocarbon Extraction and LC-GC-FID Analysis Protocols
Paperboard LC-GC-FID testing requires ethanol swelling, mCPBA epoxidation, and accurate UCM baseline integration to verify MOSH and MOAH migration compliance.
Hexane Ethanol Blend
Solvent Extraction
Binary solvent mixtures provide optimized polar and non-polar characteristics for extracting organic contaminants from cellulosic matrices. To measure mineral oil residues in recycled pulp, a hexane ethanol blend is employed to ensure complete recovery of both hydrophobic and hydrophilic compounds from the paper fibers. This combination swells the cellulose structure while dissolving the target analytes for subsequent analysis.
Dissolution Chemistry
Liquid extraction of paperboard relies on the synergetic interaction of different solvent polarities. The polar ethanol component of the hexane ethanol blend effectively disrupts hydrogen bonding between cellulose chains, which exposes trapped mineral oils to the non-polar hexane. This swelling mechanism increases the surface area of the fiber network, facilitating the rapid transfer of hydrocarbons into the liquid phase.
Without this dual-action solvent system, tightly bound mineral oil fractions would remain trapped in the crystalline regions of the recycled fibers, leading to underestimated contaminant levels.
Packaging Safety
Regulatory testing of food contact materials demands rigorous extraction protocols to prove compliance. Utilizing the hexane ethanol blend allows laboratories to simulate extreme fat contact or long-term storage scenarios. This method yields a conservative estimate of the total migratable substance load, helping manufacturers certify the safety of their foodboard.