Journal of Nanoparticle Research

, Volume 10, Issue 3, pp 437–448 | Cite as

The characters of self-assembly core/shell nanoparticles of amphiphilic hyperbranched polyethers as drug carriers

Research Paper


The characters of self-assembly core/shell nanoparticles of amphiphilic hyperbranched polyethers (HP-g-PEO) as drug carriers were investigated. The HP-g-PEO consisting of hydrophobic HP-g-PEO core and hydrophilic poly(ethylene glycol) arms was prepared by the cation ring-opening polymerization. A series of HP-g-PEO samples with different degree of branching (DB) were synthesized under various reaction temperatures. Nanoparticles (NP) were obtained by self-assembly of HP-g-PEO in aqueous media. The structure of resulting HP-g-PEO was characterized by IR, 13CNMR and GPC. Dynamic light scattering and transmission electron microscopy were applied to characterize the sizes and size distributions of NP. The results demonstrated that the mean diameters of NP were less than 100 nm, which exhibited uniform spherical formations and narrow size distributions. Using hydrophobic drug Probucol (PRO) as model drug, the particle sizes of drug loaded NP were larger than relative blank NP. The drug loading efficiency (LE) and incorporation efficiency (IE) of these NP were achieved to 35 and 89%, respectively. The in vitro release of PRO from the NP exhibited a sustained release and the cumulative drugs released for more than 600 h. The most important factor to affect drug release was the value of DB of HP-g-PEO. With the DB of HP-g-PEO increasing, the size and size distribution of NP decreased as well as the release rate. However, the small DB was beneficial to the LE of NP. Nanoparticle size and size distribution, LE, IE, and drug release rate were slightly affected by the initial solution concentration of polyethers. The co-incorporated hydrophilic drug had influence slightly on the release of drug from drug loaded NP. The results of in vitro drug release suggested that the core/shell NP performed good controlled release behaviors with potential practice as novelty drug delivery vehicles.


Amphiphilic hyperbranched polyether Nanoparticle Probucol Self-assembly Drug delivery Nanomedicine 



This work is supported by the National Natural Science Foundation of China (Grant No. 20676079, 20376045), and partly supported by the Nanometer Technology Program of Science and Technology Committee of Shanghai (0452 nm037).


  1. Bazile D, Prud'homme C, Bassoullet M-T, Marlard M, Spenlehauer G, Veillard M (1995) Stealth Me.PEG–PLA nanoparticles avoid uptake by the mononuclear phagocytes system. J Pharm Sci 84(4):493–498CrossRefGoogle Scholar
  2. Birrenbach G, Speiser PP (1976) Polymerized micelles and their use as adjuvants in immunology. J Pharm Sci 65:1763–1766CrossRefGoogle Scholar
  3. Calvo P, Gouritin B, Brigger I, Lasmezas C, Deslys JP, Williams A, Andreux JP, Dormont D, Couvreur P (2001) PEGylated polycyanoacrylate nanoparticles as vector for drug delivery in prion diseases. J Neurosci Meth 111(2):151–155CrossRefGoogle Scholar
  4. Chen Y, Bednarek M, Kubisa P, Penczek S (2002) Synthesis of Multihydroxyl branched polyethers by cationic copolymerization of 3,3-Bis(hydroxymethyl)oxetane and 3-Ethyl-3-(hydroxymethyl)oxetane. J Polym Sci Pol Chem 40:1991–2002CrossRefGoogle Scholar
  5. Esfand R, Tomalia DA (2001) Poly(amidoamine) (PAMAM) dendrimers: from biomimicry to drug delivery and biomedical applications. Drug Discov Today 6(8):427–436CrossRefGoogle Scholar
  6. Firestone MA, Wolf AC, Seifert S (2003) Small-angle x-ray scattering study of the interaction of poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) triblock copolymers with lipid bilayers. Biomacromolecules 4(6):1539–1549CrossRefGoogle Scholar
  7. Fonseca C, Simoes S, Gaspar RE (2002) Paclitaxel-loaded PLGA nanoparticles: preparation, physicochemical characterization and in vitro anti-tumoral activity. J Control Release 83(2):273–286CrossRefGoogle Scholar
  8. French BM (1990) Twenty-five years of the impact-volcanic controversy: is there anything under the sun? or inside the Earth? Eos 71:411–414Google Scholar
  9. Galindo-Rodriguez SA, Allemann E, Fessi H, Doelker E (2005) Polymeric nanoparticles for oral delivery of drugs and vaccines: a critical evaluation of in vivo studies. Crit Rev Ther Drug 22(5):419–463Google Scholar
  10. Gillies ER, Frechet JMJ (2005) Dendrimers and dendritic polymers in drug delivery. Drug Discov Today 10(1):35–43CrossRefGoogle Scholar
  11. Hawker CJ, Lee R, Frechet JMJ (1991) One-step synthesis of hyperbranched dendritic polyesters. J Am Chem Soc 113(12):4583–4588CrossRefGoogle Scholar
  12. Hedenqvist MS, Yousefi H, Malmstrom E, Johansson M, Hult A, Gedde UW, Trollsas M, Hedrick JL (2000) Transport properties of hyperbranched and dendrimer-like star polymers. Polymer 41(5):1827–1840CrossRefGoogle Scholar
  13. Hong Y, Coombs SJ, Cooper-White JJ, Mackay ME, Hawker CJ, Malmstrom E, Rehnberg N (2000) Film blowing of linear low-density polyethylene blended with a novel hyperbranched polymer processing aid. Polymer 41(21):7705–7713CrossRefGoogle Scholar
  14. Joralemon MJ, O’Reilly RK, Hawker CJ, Wooley KL (2005a) Shell Click-crosslinked (SCC) nanoparticles: a new methodology for synthesis and orthogonal functionalization. J Am Chem Soc 127(48):16892–16899CrossRefGoogle Scholar
  15. Joralemon MJ, Smith NL, Holowka D, Baird B, Wooley KL (2005b) Antigen-decorated shell cross-linked nanoparticles: synthesis, characterization, and antibody interactions. Bioconjug Chem 16(5):1246–1256CrossRefGoogle Scholar
  16. Kataoka K, Harada A, Nagasaki Y (2001) Block copolymer micelles for drug delivery: design, characterization and biological significance. Adv Drug Deliv Rev 47(1):113–131CrossRefGoogle Scholar
  17. Kim DH, Martin DC (2006) Sustained release of dexamethasone from hydrophilic matrices using PLGA nanoparticles for neural drug delivery. Biomaterials 27(15):3031–3037CrossRefGoogle Scholar
  18. Kim YH (1998) Hyperbranchecs polymers 10 years after. J Polym Sci Pol Chem 36(11):1685–1698CrossRefGoogle Scholar
  19. Kreuter J (1978) Nanoparticles and nanocapsules–new dosage forms in the nanometer size range. Pharm Acta Helv 53:33–39Google Scholar
  20. Magnusson H, Malmstrom E, Hult A, Johansson M (2002) The effect of degree of branching on the rheoligical and thermal properties of hyperbranched aliphatic polyethers. Polymer 43:301–306CrossRefGoogle Scholar
  21. Mai YY, Zhou YF, Yan DY, Lu HW (2003) Effect of reaction temperature on degree of branching in cationic polymerization of 3-ethyl-3-(hydroxymethyl)oxetane. Macromolecules 36(25):9667–9669CrossRefGoogle Scholar
  22. Meng FH, Hiemstra C, Engbers GHM, Feijen J (2003) Biodegradable polymersomes. Macromolecules 36(9):3004–3006CrossRefGoogle Scholar
  23. Moghimi SM, Hunter AC, Murray JC (2001) Long-circulating and target-specific nanoparticles: theory to practice. Pharmacol Rev 53(2):283–318Google Scholar
  24. Na K, Lee TB, Park KH, Shin EK, Lee YB, Cho HK (2003) Self-assembled nanoparticles of hydrophobically-modified polysaccharide bearing vitamin H as a targeted anti-cancer drug delivery system. Eur J Pharm Sci 18(2):165–173CrossRefGoogle Scholar
  25. Na K, Park KH, Kim SW, Bae YH (2000) Self-assembled hydrogel nanoparticles from curdlan derivatives: characterization, anti-cancer drug release and interaction with a hepatoma cell line (HepG2). J Control Release 69(2):225–236CrossRefGoogle Scholar
  26. Oh KS, Lee KE, Han SS, Cho SUH, Kim D, Yuk SH (2005) Formation of core/shell nanoparticles with a lipid core and their application as a drug delivery system. Biomacromolecules 6(2):1062–1067CrossRefGoogle Scholar
  27. Orlicki JA, Moore JS, Sendijarevic I, McHugh AJ (2002) Role of end-group functionality on the surface segregation properties of HBPs in blends with polystyrene: application of HBPs as dewetting inhibitors. Langmuir 18(25):9985–9989CrossRefGoogle Scholar
  28. Patri AK, Majoros IJ, Baker JR (2002) Dendritic polymer macromolecular carriers for drug delivery. Curr Opin Chem Biol 6(4):466–471CrossRefGoogle Scholar
  29. Pattison D (1957) Cyclic Ethers Made by Pyrolysis of Carbonate Esters. Cyclicet Hersm Adeb y Pyrolysoifs Carbonaetset Ers 79:3455–3456Google Scholar
  30. Qiu T, Tang LM, Fu ZW, Tuo XL, Liu DS, Yang WT (2004) Modification of end-groups of aliphatic hyperbranched polyester. Polym Adv Technol 15(1–2):65–69CrossRefGoogle Scholar
  31. Ritger PL, Peppas NA (1987) A simple equation for description of solute release I. Fickian and non-fickian release from non-swellable devices in the form of slabs, spheres, cylinders or discs. J Control Release 5(1):23–36CrossRefGoogle Scholar
  32. Robinson DN, Peppas NA (2002) Preparation and characterization of pH-responsive poly(methacrylic acid-g-ethylene glycol) nanospheres. Macromolecules 35(9):3668–3674CrossRefGoogle Scholar
  33. Shenoy DB, Amiji MA (2005) Poly(ethylene oxide)-modified poly(epsilon-caprolactone) nanoparticles for targeted delivery of tamoxifen in breast cancer. Int J Pharm 293(1–2):261–270CrossRefGoogle Scholar
  34. Slagt MQ, Stiriba SE, Kautz H, Gebbink RJMK, Frey H, van Koten G (2004) Optically active hyperbranched polyglycerol as scaffold for covalent and noncovalent immobilization of platinum(II) NCN-pincer complexes. Catalytic application and recovery. Organometallics 23(7):1525–1532CrossRefGoogle Scholar
  35. Sparnacci K, Laus M, Tondelli L, Magnani L, Bernardi C (2002) Core-shell microspheres by dispersion polymerization as drug delivery systems. Macromol Chem Phys 203(10–11):1364–1369CrossRefGoogle Scholar
  36. Tardif J-C, Côté G, Lespérance J, Bourassa M, Lambert J, Doucet S, Bilodeau L, Nattel S, Guise Pd (1997) Probucol and multivitamins in the prevention of restenosis after coronary angioplasty. N Engl J Med 337:365–372CrossRefGoogle Scholar
  37. Van Benthem RATM (2000) Novel hyperbranched resins for coating applications. Prog Org Coat 40:203–214CrossRefGoogle Scholar
  38. Vinogradov S, Batrakova E, Kabanov A (1999) Poly(ethylene glycol)-polyethyleneimine NanoGel (TM) particles: novel drug delivery systems for antisense oligonucleotides. Colloid Surf B 16(1–4):291–304CrossRefGoogle Scholar
  39. Voit B (2000) New developments in hyperbranched polymers. J Polym Sci Pol Chem 38:2505–2525CrossRefGoogle Scholar
  40. Xu J, Wu H, Mills OP, Heiden PA (1999) A morphological investigation of thermosets toughened with novel thermoplastics I. Bismaleimide modified with hyperbranched polyester. J Appl Polym Sci 72(8):1065–1076CrossRefGoogle Scholar
  41. Xu YY, Gao C, Kong H, Yan DY, Luo P, Li WW, Mai YY (2004) One-pot synthesis of amphiphilic core-shell suprabranched macromolecules. Macromolecules 37(17):6264–6267CrossRefGoogle Scholar
  42. Yan DY, Zhou YF, Hou J (2004) Supramolecular self-assembly of macroscopic tubes. Science 303(5654):65–67CrossRefGoogle Scholar
  43. Yang YY, Wang Y, Powell R, Chan P (2006) Polymeric core-shell nanoparticles for therapeutics. Clin Exp Pharmacol P 33(5–6):557–562CrossRefGoogle Scholar
  44. Zhang ZP, Feng SS (2006) The drug encapsulation efficiency, in vitro drug release, cellular uptake and cytotoxicity of paclitaxel-loaded poly(lactide)-tocopheryl polyethylene glycol succinate nanoparticles. Biomaterials 27(21):4025–4033CrossRefGoogle Scholar
  45. Zhu XY, Chen L, Yan DY, Chen Q, Yao YF, Xiao Y, Hou J, Li JY (2004) Supramolecular self-assembly of inclusion complexes of a multiarm hyperbranched polyether with cyclodextrins. Langmuir 20(2):484–490CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.College of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghaiChina

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