Nanosize (50 nm) alginate gel was made by loading alginate into the pluronic nanocarrier,
followed by adding calcium ions to induce calcium ion-induced crosslinking inside
the nano-carrier without using any organic solvent during the preparation. The alginate gel
formation inside the nano-carrier did not alter the size or the surface charge of the
nano-carrier, and the residence of alginate inside the nano-carrier in physiological buffer
was greatly increased by calcium ion complexation. Also, this complex nanogel could be
re-dispersed after lyophilization without aggregation. In addition, proteins were efficiently
loaded into the alginate gel-filled nano-carrier by simple co-incubation at 4 C, followed by
increase to 37 C, and this alginate gel-filled nano-carrier showed prolonged release of proteins
over one month while preserving the bioactivity of proteins. Therefore, pluronic-based
nanogel was effective for easy preparation of nanosize alginate gel in it. The presence of
pluronic shell of the composite nanogel did not hinder the loading or sustained release of
positively charged proteins from negatively charged alginate gel inside, but rather provided
the neutralization of surface charge and enhanced stability of the nanosize alginate gel.
Nanosize (50 nm) alginate gel was made by loading alginate into the pluronic nanocarrier,followed by adding calcium ions to induce calcium ion-induced crosslinking insidethe nano-carrier without using any organic solvent during the preparation. The alginate gelformation inside the nano-carrier did not alter the size or the surface charge of thenano-carrier, and the residence of alginate inside the nano-carrier in physiological bufferwas greatly increased by calcium ion complexation. Also, this complex nanogel could bere-dispersed after lyophilization without aggregation. In addition, proteins were efficientlyloaded into the alginate gel-filled nano-carrier by simple co-incubation at 4 C, followed byincrease to 37 C, and this alginate gel-filled nano-carrier showed prolonged release of proteinsover one month while preserving the bioactivity of proteins. Therefore, pluronic-basednanogel was effective for easy preparation of nanosize alginate gel in it. The presence ofpluronic shell of the composite nanogel did not hinder the loading or sustained release ofpositively charged proteins from negatively charged alginate gel inside, but rather providedthe neutralization of surface charge and enhanced stability of the nanosize alginate gel.
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