PEG Oxidative Degradation and Peroxide Testing of SiO₂ Nanoparticle Formulations

We are looking for a qualified laboratory to evaluate SiO₂ nanoparticles in PEG for oxidative degradation of the PEG-containing formulation. We need to determine whether oxidative degradation has occurred and quantify the amount of peroxide and/or hydroperoxide present, preferably reported as meq peroxide/kg of sample or ppm peroxide equivalent.

We have 4 sample types for testing and prefer a turnaround time of 10 business days or less. Please also advise on the minimum sample quantity required for analysis.