“…Successful PEG separations have been achieved with the more expensive techniques of size exclusion chromatography (more specifically gel permeation chromatography, GPC) [2], higher temperature (80 o C) multi-column reverse phase high performance liquid chromatography (HPLC) and supercritical fluid chromatography [7], capillary gel electrophoresis [36], liquid chromatography coupled with mass spectroscopy (LC-MS) [34] and ion exchange chromatography [37]. There are many disadvantages with these methods however.…”