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Ratios for PEG4-acid place-exchange reactions (calculated tiopronin:PEG feed in solution (mol:mol))and resulting PEG surface coverage percentages by NMR and IM-MS. PEG feed ratio was determined from calulated molar concentrations of tiopronin on the monolayer surface as determined for original TMPCs.
| Tiopronin(Au): Free PEG Feed Ratio (mol:mol) |
PEG Surface Coverage (mol percentage) |
|
|---|---|---|
| IM-MS | NMR | |
| 15:1 | 15% | 10% |
| 10:1 | 19% | 13% |
| 2:1 | 55% | 60% |
| 1:1 | 74% | 75% |
| Tiopronin | Thiol-dPEG® 4-acid (PEG) | |
 |
 |
|
