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- W2087512001 abstract "Alginate microcapsule swelling, which occurs as a result of increased hydrophilicity owing to the Ca++ that remains after rapid chelation of the inner alginate core, is a problem in encapsulation. We have previously shown that exchange of the residual divalent Ca++ with the monovalent Na+ through the use of 6 mmol/L Na2SO4 decreases swelling in chelated alginate-polylysine-alginate microcapsules, and this process enhances their durability. The purpose of the present study was to examine the morphology of Na2SO4-treated microcapsules in long-term incubation with the use of serum-supplemented culture medium.Spherical beads of purified alginate (3%) that were gelled with 1.1% CaCl2 were first coated with polylysine, and then with 0.24% alginate. After rapid chelation of the inner alginate core with 55 mmol/L sodium citrate, the capsules were either incubated for 30 minutes in 6 mmol/L Na2SO4 or left untreated (control). Each group of capsules was then placed in a flask containing Ham's culture medium supplemented with 20% porcine serum and incubated at 37 degrees C.The diameters of Na2SO4-treated capsules only increased modestly from a mean +/- SD of 635 +/- 22.08 to 684.53 +/- 17.86 microm (P<0.0001) by day 7, with no further increases thereafter. In contrast, control capsules showed a steady increase in their mean diameters, which changed from 639.55 +/- 21.44 to 735.48 +/- 108.85 microm (P < 0.0001) by day 66. In addition, whereas treated capsules remained spherical, control capsules showed progressive polymorphism.We have developed a new method of making more durable and stable microcapsules that can be used for islet cell xenotransplantation." @default.
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- W2087512001 date "2001-11-01" @default.
- W2087512001 modified "2023-10-04" @default.
- W2087512001 title "Prevention of Morphological Changes in Alginate Microcapsules for Islet Xenotransplantation" @default.
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- W2087512001 doi "https://doi.org/10.2310/6650.2001.33722" @default.
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