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Examples of pH-dependent polymer coatings used for colonic targeting.
| Polymer | Optimum pH |
|---|---|
| Eudragit® S-100 | 7.0 |
| Eudragit® FS 30D | 7.0 |
| Eudragit® L-100 | 6.0 |
| Cellulose acetate phthalate | 6.0 |
| Cellulose acetate trimellitate | 5.5 |
| Eudragit® L 30D-55 | 5.5 |
| Eudragit® L 100-55 | 5.5 |
| Hydroxypropyl methylcellulose phthalate 55 | 5.5 |
| Hydroxypropyl methylcellulose phthalate 50 | 5.0 |
| Polyvinyl acetate phthalate | 5.0 |
