Les nanogels sont des nanosyst�mes non ioniques et ioniques constitu�s de polym�res r�ticul�s physiquement ou chimiquement, hydrophiles, hydrophobes ou amphiphiles. Les mat�riaux formant les nanogels peuvent �galement �tre constitu�s de polysaccharides et de prot�ines, s�lectionn�s en fonction de leur biod�gradabilit� et de leur moindre immunog�nicit�. Ces nanogels sont particuli�rement efficaces pour augmenter la charge utile du m�dicament dans la r�gion cibl�e et pour contr�ler la propension de tous les autres nanocarriers � fuir le bioactif charg�. Les GN d'un diam�tre compris entre 1 et 1000 nm int�grent les propri�t�s des hydrogels et des nanomat�riaux. Un nouveau transporteur de m�dicaments doit pr�senter deux caract�ristiques principales: il doit transporter le m�dicament � la vitesse souhait�e et le d�livrer avec succ�s au site cible. Par cons�quent, les nanogels poss�dent plusieurs propri�t�s sophistiqu�es qui peuvent contribuer au d�veloppement de nouveaux syst�mes d'administration. Un nanogel est d�fini comme "un syst�me semi-solide constitu� d'une dispersion de petites particules inorganiques ou de grosses particules organiques contenues et interp�n�tr�es par un liquide" par la pharmacop�e des �tats-Unis.

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