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Varying the sustained release of BMP‐2 from chitosan nanogel‐functionalized polycaprolactone fiber mats by different polycaprolactone surface modifications
Author(s) -
Sundermann Julius,
Oehmichen Sarah,
Sydow Steffen,
Burmeister Laura,
Quaas Bastian,
Hänsch Robert,
Rinas Ursula,
Hoffmann Andrea,
Menzel Henning,
Bunjes Heike
Publication year - 2021
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.37045
Subject(s) - polycaprolactone , materials science , chitosan , surface modification , fiber , bone morphogenetic protein 2 , coating , chemical engineering , contact angle , nanogel , composite material , polymer chemistry , in vitro , drug delivery , polymer , nanotechnology , chemistry , biochemistry , engineering
Polycaprolactone (PCL) fiber mats with different surface modifications were functionalized with a chitosan nanogel coating to attach the growth factor human bone morphogenetic protein 2 (BMP‐2). Three different hydrophilic surface modifications were compared with regard to the binding and in vitro release of BMP‐2. The type of surface modification and the specific surface area derived from the fiber thickness had an important influence on the degree of protein loading. Coating the PCL fibers with polydopamine resulted in the binding of the largest BMP‐2 quantity per surface area. However, most of the binding was irreversible over the investigated period of time, causing a low release in vitro . PCL fiber mats with a chitosan‐graft‐PCL coating and an additional alginate layer, as well as PCL fiber mats with an air plasma surface modification boundless BMP‐2, but the immobilized protein could almost completely be released. With polydopamine and plasma modifications as well as with unmodified PCL, high amounts of BMP‐2 could also be attached directly to the surface. Integration of BMP‐2 into the chitosan nanogel functionalization considerably increased binding on all hydrophilized surfaces and resulted in a sustained release with an initial burst release of BMP‐2 without detectable loss of bioactivity in vitro .