title: Amphiphilic polylactic acid-hyperbranched polyglycerol nanoparticles as a controlled release system for poorly water-soluble drugs: physicochemical characterization.
abstract: OBJECTIVE
  Quercetin was applied as a model drug to evaluate the potential application of amphiphilic polylactic acid-hyperbranched polyglycerol (HPG-PLA) nanoparticles as carriers for poorly water-soluble drugs.
  
  
  METHODS
  The drug delivery systems were characterized by dynamic light scattering, powder X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) and so forth.
  
  
  RESULTS
  The results showed the particle sizes ranged from 205.3 to 433.3 nm with low polydispersity index. XRD and FTIR demonstrated that the crystal of the drug was converted to an amorphous state in the matrices and formed intermolecular interaction with carriers. The drug encapsulation efficiency and drug loading could reach 91.8% and 21.0%, respectively. Cell viability assay suggested the nanoparticles had good cytocompatibility. The in-vitro drug release profiles showed a sustained quercetin release up to 192 h, indicating the suitability of nanoparticles in sustained drug release. Furthermore, the influence of many factors on release profiles could also be evaluated for the potential of using nanoparticles as controlled release systems.
  
  
  CONCLUSIONS
  This system may be of clinical importance in both stabilizing and delivering hydrophobic drugs for the treatment of many diseases.
authors.affiliation: Key Laboratory of Functional Polymer Materials of Ministry Education, Institute of Polymer Chemistry, Nankai University, Tianjin, China.
authors.forename: Xiujun
authors.initials: X
authors.lastname: Gao
authors.forename: Xinge
authors.initials: X
authors.lastname: Zhang
authors.forename: Xuejiao
authors.initials: X
authors.lastname: Zhang
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Sun
authors.forename: Chaoxing
authors.initials: C
authors.lastname: Li
mesh_terms: D016475:3T3 Cells; D000818:Animals; D002470:Cell Survival / Q000187:drug effects; D003460:Crystallization; D003692:Delayed-Action Preparations / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D019344:Lactic Acid / Q000737:chemistry*; D051379:Mice; D053769:Nanocapsules / Q000009:adverse effects / Q000737:chemistry*; D010316:Particle Size; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*; D011794:Quercetin / Q000008:administration & dosage*; D012995:Solubility; D013678:Technology, Pharmaceutical; D014867:Water
chemical_list: D003692:Delayed-Action Preparations; D053769:Nanocapsules; D011091:Polyesters; D011108:Polymers; D014867:Water; C043941:polyglycerol; D019344:Lactic Acid; C033616:poly(lactide); D011794:Quercetin; D005990:Glycerol