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Abstract
The present review deals with the design and preparation of environment-sensitive hyperbranched polymers, such as pH-, temperature-sensitive and salt-triggered polymers, in order to be employed as drug-delivery system. In particular, using known and well-characterized basic hyperbranched polymers as starting materials, this review discusses the kind of structural modifications that these polymers were subjected to for preparing nanocarriers of low toxicity, high encapsulating capacity, specificity to certain biological cells and transport ability under different environment conditions. Due to the great number of external groups of hyperbranched polymers either functionalization or multifunctionalization can occur, providing products that fulfill one or more of the requirements that an effective drug carrier should exhibit. Thus, hyperbranched polymers will play a significant role in the future development of new biomedical devices for the treatment of human diseases.
