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Core-Shell Spheroidal Hydrogels Produced via Charge-Driven Interfacial Complexation.
ACS Applied Polymer Materials ( IF 5 ) Pub Date : 2020-02-12 , DOI: 10.1021/acsapm.9b01086
Vincenzo Calabrese 1 , Davide Califano 1, 2 , Marcelo A da Silva 1 , Julien Schmitt 1 , Saffron J Bryant 1 , Kazi M Zakir Hossain 1 , Ana M Percebom 3 , Aurora Pérez Gramatges 3 , Janet L Scott 1, 2 , Karen J Edler 1
Affiliation  

Through charge-driven interfacial complexation, we produced millimeter-sized spheroidal hydrogels (SH) with a core-shell structure allowing long-term stability in aqueous media. The SH were fabricated by extruding, dropwise, a cationic cellulose nanofibril (CCNF) dispersion into an oppositely charged poly(acrylic acid) (PAA) bath. The SH have a solid-like CCNF-PAA shell, acting as a semipermeable membrane, and a liquid-like CCNF suspension in the core. Swelling behavior of the SH was dependent on the osmotic pressure of the aging media. Swelling could be suppressed by increasing the ionic strength of the media as this enhanced interfibrillar interactions and thus strengthened the outer gel membrane. We further validated a potential application of SH as reusable matrixes for glucose oxidase (GOx) entrapment, where the SH work as microreactors from which substrate and product are freely able to migrate through the SH shell while avoiding enzyme leakage.

中文翻译:

通过电荷驱动界面络合产生的核-壳球形水凝胶。

通过电荷驱动的界面络合,我们生产了具有核-壳结构的毫米大小的球形水凝胶(SH),可在水性介质中长期稳定。SH是通过将阳离子纤维素纳米原纤维(CCNF)分散体逐滴挤出到带相反电荷的聚丙烯酸(PAA)浴中制成的。SH具有固体状的CCNF-PAA壳,可充当半透膜,芯层中具有液态的CCNF悬浮液。SH的膨胀行为取决于老化介质的渗透压。可通过增加介质的离子强度来抑制肿胀,因为这种增强的原纤维间相互作用并因此增强了外凝胶膜。我们进一步验证了SH作为可重复使用的葡萄糖氧化酶(GOx)诱捕基质的潜在应用,
更新日期:2020-02-25
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