En raison de la journée d’action nationale, la livraison de votre commande en ligne pourrait prendre un peu plus de temps que d’habitude. Besoin de quelque chose en urgence ? Réservez-le et récupérez-le deux heures plus tard dans un magasin disposant de stock.

Retrait en 2 heures
Assortiment impressionnant
Paiement sécurisé
Toujours un magasin près de chez vous

Retrait gratuit dans votre magasin Club
7.000.0000 titres dans notre catalogue
Payer en toute sécurité
Toujours un magasin près de chez vous

Magasins

Wishlist

Magasins

Wishlist

Chercher

Livres

Papeterie

Jeux

Cadeaux

Tous les produits

Ebooks

Carte cadeau Club

Promotions

118,45 €

+ 236 points

Livraison 1 à 2 semaines

Passer une commande en un clic

Payer en toute sécurité

Livraison en Belgique: 3,99 €

Livraison en magasin gratuite

Description

Chemistry was at one time completely described in terms of collision theo- ry, in which one molecule collided with another, sometimes producing reac- tion. Then came the realization that enzymes which are highly efficient ca- talysts, work by way of prior complexation, often stereospecific, which is then followed by chemical reaction. Thus, systems that exhibit "host-guest" relationships, i.e., that show complexing are being looked at an ever in- creasing frequency. The cyclodextrins are the first and probably the most important example of compounds that exhibits complex formation. This is a book about the cyclodextrins. There are of course other compounds that exhibit "host-guest" relationships and thus bind other organic molecules, but so far they have not achieved the importance of the cyclodextrins. By their name it is obvious that cyclodextrins are cyclic compounds. The complexes that they form are therefore cyclic inclusion complexes. Because the complexes are cyclic in nature, complexation can be very strong, as op- posed to 1t-complex, electrostatic, or apolar complexes in which complex formation is two-dimensional rather than three-dimensional. Cyclodextrins turn out to be excellent models of enzymes. This is proba- bly not fortuitous because they were first sought since it was discovered that the principal binding in the enzyme chymotrypsin was a cyclic inclusion complex. Cyclodextrins can do more than form cyclic inclusion complexes, they can catalyze as well. But catalysis always occurs after complex formation.