| Autor: |
SCHOO, HFM, CHALLA, G, ROWATT, B, SHERRINGTON, DC |
| Přispěvatelé: |
Polymer Chemistry and Bioengineering |
| Jazyk: |
angličtina |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Reactive polymers, 16(2), 125-136 |
| ISSN: |
0923-1137 |
| Popis: |
Disks obtained by polymerization of high internal phase emulsions (Polyhipe) had completely open pore structures and were used as a carrier material for the immobilisation of 10-ethyl-isoalloxazine ('flavin'). Three methods for immobilization are described: (1) direct modification of chloromethylated Polyhipe with flavin and triethylamine, (2) deposition of a polyelectrolyte complex of flavin-containing polycations and poly(sodium styrenesulphonate) onto the (internal) surface of a Polyhipe; and (3) complexation of flavin-containing polycations on the (internal) surface of a sulphonated Polyhipe. The catalytic activity per flavin moiety in the continuous aerobic oxidation of 1-benzyl-1,4-dihydronicotinamide depends on the method of immobilization and on the loading with catalytic moieties, factors influencing the accessibility and distribution of catalytic sites over the pore surface and the matrix of the Polyhipe. Optimum activity was found in the case of method 3. All methods resulted in excellent stability of the immobilized catalyst in continuous reactions. The linear polycations immobilized by methods 2 and 3 can be decomplexed completely after the continuous reaction, using a ternary solvent, and analyzed by homogeneous spectroscopic techniques, providing a powerful tool in the study of the fate of catalysts in continuous processes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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