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The parameters important for contrast agent efficiency include the molecular rotational correlation 33 34 1 CD-Based Rotaxanes and Polyrotaxanes as Representative Supramolecules time (???? r ), the number of coordinated water molecules (q), and the lifetime of their water molecules in the inner coordination sphere (???? m ). The commercial contrast agents are often based on Gd-DOTA (DOTA = 1,4,7, 10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) or Gd-DTPA complexes (DTPA = diethylene triamine pentaacetic acid) [100].

11 Polyrotaxanes 16a,b. process. The presence of methoxy groups in 16b promoted the adsorption of collagen onto the surface. Although the mobility of the polymer surface did not influence the amount of proteins adsorbed, it influenced the formation of a soft-dissipative layer of collagen on the surface. The collagen in this layer had reaggregated to form thicker fibrils aligned in a specific direction. This affected in vivo responses, where the high molecular mobility facilitated by 16b induced faster molecular rearrangement leading to the formation of a new collagen layer at the implant–tissue interface.

Moreover, a tyramine-functionalized eight-arm PEG, that is, PEG-Tyr was added into the hydrogels to generate a branched network and improve the stability of hydrogels. The obtained hydrogels were assessed for possible tissue engineering applications relying on drug and cell delivery. 33 Formation of the C—O and C—C bonds between two phenyl groups. Gels containing α-CD, threaded onto Pluronic F68 or F127 with tyramine end groups, have been investigated. All gels have been covalently cross-linked through the phenolic end groups using H2 O2 /HRP.

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