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Agave fibers were used to elaborate a transparent and flexible cellulose hydrogel films used as scaffold for tissue regeneration and tested by in vitro assays with NIH 3T3 fibroblast cells. Using dimethylacetamide/lithium chloride (DMAc/LiCl) system was possible to obtain cellulose solutions and hydrogel films were prepared by phase inverse method without cross-linker. The concentration of LiCl in the DMAc solution was varied from 4 to 12 wt% in the phase inversion process and then the cytotoxicity was tested for 14 days on the cultivation. The resultant hydrogel films showed better cytocompatibility than the PS dish used as control. The cell growing images showed that the hydrogel films with lower LiCl apparently contained ordered and aggregated fiber orientation. This comparison suggested that the segmental microstructure in the hydrogel films influenced fibroblast cells spreading. In addition, the agave hydrogel films displayed good stability without biodegradiation through the cell cultivation.
Polyacrylonitrile copolymer having amphiphilic octyl-dimetyl quarternized ammonium moiety was used as imprint scaffolding media for Theophylline (THO) adsorbent. The THO imprinted membranes were prepared by phase inversion technique; The polymer dimethylsulfoxide (DMSO) solution containing THO was cast and then phase-inversed in water to prepare THO imprinted membranes. After template extraction, adsorbent properties of THO were studied by heterogeneous binding experiments of THO and analogs such as caffeine, uracil, and theobromine. Results showed that imprinting effect was appeared in copolymer containing both octyl-hydrophobic group and positively charged ammonium groups.
Polyacrylonitrile having methacrylic acid [P(AN-co-MAA)] and acrylic acid [P(AN-co-AA)] was used for phase inversion imprinting of uracil (URA). Resultant imprinted membranes had porous morphology and showed permselective binding of URA, when 32 μM URA aqueous solution was permeated under pressure gradient of 100 Pa across the membrane. Under the circumstance, the imprinted P(AN-co-MAA) membrane bound 7.9 μmol/g of URA with 8.4×10−6 m3/m2·s of volume flux. The imprinted P(AN-co-AA) membrane showed loose selectivity relative to the P(AN-co-MAA) membrane. Binding behavior of URA and dimethyluracil (DMURA) was also compared in both imprinted membranes. Evidence was presented that P(AN-co-MAA) with methacrylic segments was effective for URA imprinting and resulted in high URA selectivity in the permselective binding experiments.
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