
The authors developed a method to accurately measure the average molecular weight of large poly(ethylene glycols) (PEGs) using ion-mobility time-of-flight mass spectrometry coupled with gas-phase ion–molecule reactions.
Weibin Chen is a principal research chemist at Biopharmaceutical Sciences, Waters Corporation, 34 Maple Street, Milford, MA 01757.

The authors developed a method to accurately measure the average molecular weight of large poly(ethylene glycols) (PEGs) using ion-mobility time-of-flight mass spectrometry coupled with gas-phase ion–molecule reactions.