Objective: To synthesize a targeted drug delivery system for 5-fluorouracil (5Fu) using sulfadiazine (SF) as a carrier with reduced side-effects and strong antitumor activity.
Methods: SF-poly (ethylene glycol) (PEG) conjugate was initially synthesized. 5Fu was subjected to reaction with trichloromethyl chloroformate to prepare chloroformyl 5Fu, which was linked to a spacer hydroxyl group of PEG that served as a macromolecular linking arm between SF and 5Fu. The content of 5Fu in the conjugate was determined by ultraviolet spectrophotometry. Spectrum of ultraviolet and infrared along with differential scanning calorimetry were employed to identify the structure of the conjugate of SFPEG-end capped 5Fu.
Results: The drug loading content of the conjugate was 3.2 %, and structural analysis confirmed the linkage between 5Fu and SF via PEG.
Conclusion: Targeted drug delivery system for 5Fu using SF as a carrier has been successfully synthesized by this means.
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