Control of transport characteristic of membrane by multi-layering of polyelectrolyte complex toward microcapsule-shaped bioartificial pancreas

Shinji Sakai, Tsutomu Ono, Hiroyuki Ijima, Koei Kawakami

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In order to develop a microcapsule-shaped bioartificial pancreas, it is important to control the transport characteristics of the semipermeable membrane. We attempt to control the transport characteristics of the membrane by changing the coating layer number of polyelectrolyte complex between glycol chitosan (GC, M. W.>8.2×10 4) and alginate (Alg) on the microcapsule. From measurement of diffusivities of bovine serum albumin (BSA, M. W.=6.7×10 4) and γ-globulin (M. W. = 1.6×10 5), these diffusion rates through the membrane drastically decrease with increasing layer number of GC-Alg. The microcapsule coated with four layers of polyelectrolyte complex successfully rejects γ-globulin with effective permeability of BSA. In addition, the diffusivity of glucose (M. W.=180) indicateds that the multi-layering of polyelectrolyte complex hardly affects the diffusivity of small substances such as nutrients and oxygen. These results indicate that the polyelectrolyte complex prepared by the multilayering method is useful to control the transport characteristic of membranes and the four-layered GC -Alg polyelectrolyte complex microcapsule is promising for a microcapsule-shaped bioartificial pancreas.

Original languageEnglish
Number of pages1
JournalKagaku Kogaku Ronbunshu
Issue number2
Publication statusPublished - Dec 1 2001


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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