Storage and Handling Conditions for PEGs and PEG Derivatives
PEGs and PEG derivatives are sensitive to light and oxidation. Therefore, for both long time and short time storage, all PEGs and PEG derivatives should be stored under Nitrogen or Argon and in the dark.
PEG NHS Esters and Maleimides are sensitive to moisture, so that in addition to above stated storage conditions, it is important to keep them in dry conditions and at low temperature (≤ -20°C) all the time to avoid loss of activities.
For most PEGs and PEG derivatives, when properly packed under Nitrogen or Argon, it is OK to be shipped at room temperature. But for long time storage, the following conditions are strongly suggested:
- under Nitrogen or Argon atmosphere (inside the container)
- in the dark
- at low temperature (≤ -20°C)
- with desiccant (outside the container)
When PEG derivatives are taken out of the storage for usage, the container should be slowly warmed up to room temperature before opening. After usage, the container should be backfilled with Nitrogen or Argon and stored again at the above stated conditions.
For PEG NHS Esters, PEG Aldehyde, PEG Acrylate, PEG Maleimides, and other sensitive PEG products, packing in small applicable portions will help to retain activities.