International Journal of Nanomedicine (Jul 2019)

Construction of catechol-grafted chitosan alginate/barium sulfate microcapsules for computed tomography real-time imaging and gastroretentive drug delivery

  • Du F,
  • Wu Y,
  • Du F,
  • Zhang L,
  • Feng W,
  • Zhao L,
  • Cai R,
  • Xu L,
  • Bian G,
  • Li J,
  • Zou S,
  • Gong A,
  • Zhang M

Journal volume & issue
Vol. Volume 14
pp. 6001 – 6018

Abstract

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Fengyi Du,*,1,2 Yunchao Wu,*,2 Fengting Du,*,3 Lirong Zhang,3 Weiwei Feng,4 Lulu Zhao,2 Rong Cai,3 Lixia Xu,2 Gaorui Bian,5 Jiangang Li,5 Shengqiang Zou,1 Aihua Gong,2 Miaomiao Zhang21Department of Hepatosis, The Affiliated Third Hospital of Zhenjiang, Jiangsu University, Zhenjiang 212013, People’s Republic of China; 2School of Medicine, Jiangsu University, Zhenjiang 212013, People’s Republic of China; 3Department of Physiotherapy, Huangnihe Town Hospital, Huangnihe 133704, People’s Republic of China; 4School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China; 5Tianyi Health Sciences Institute (Zhenjiang) Co. Ltd, Zhenjiang 212013, People’s Republic of China*These authors contributed equally to this workBackground: The gastroretentive drug delivery system is an effective administration route, which can improve the bioavailability of the drug and the therapeutic effect by prolonging the release time of the drug and controlling the release rate in the stomach.Methods: Inspired by the excellent adhesion properties of mussel protein, we prepared novel catechol-grafted chitosan alginate/barium sulfate microcapsules (Cat-CA/BS MCs) with mucoadhesive properties and computed tomography (CT) imaging function for gastric drug delivery. First, barium sulfate nanoclusters used as CT contrast agent were synthesized in situ in the Cat-CA/BS MCs through a one-step electronic spinning method. Next, catechol-grafted chitosan as the mucoadhesive moiety was coated on the surface of Cat-CA/BS MCs by polyelectrolyte molecule self-assembly.Results: The prepared Cat-CA/BS MCs could effectively retained in the stomach for 48 hours and successively released ranitidine hydrochloride, which could be used for the treatment of gastric ulcer. Cat-CA/BS MCs exhibited superior CT contrast imaging properties for real-time tracking in vivo after oral administration.Conclusion: These findings demonstrate that Cat-CA/BS MCs serving as multifunctional oral drug carriers possess huge potential in gastroretentive drug delivery and non-invasive visualization.Keywords: catechol, mucoadhesive, microcapsules, CT imaging, gastroretentive drug delivery

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