(1) Background: Supercritical CO2 fluid (SCF-CO2)-assisted impregnation presents advantages on loading active drugs to polymer substrates, since it enables the realization of a drug-loaded polymer without any solvent residue. Besides, CO2 gas and drugs can be recycled and utilized again. Resveratrol-loaded diacetate fiber by SCF-CO2-assisted impregnation was done to give diacetate fiber biological activity function for enhancing its added value. (2) Methods: The effect of SCF-CO2 temperature, pressure and treatment time on loading ability (LA) of resveratrol onto diacetate fiber was explored by ultraviolet visible spectrophotometer. The variation of structure and property of diacetate fiber was analyzed by characterization instruments. (3) Results: LA had been increasing with SCF-CO2 treatment time, temperature and pressure when SCF-CO2 was above 70 °C, 12 MPa. The inhibiting rate of resveratrol to free radicals was affected positively by SCF-CO2. After resveratrol was impregnated by SCF-CO2 it appeared some small white granular substances on the surface of diacetate fiber. It had a good interaction between resveratrol and molecular chain of diacetate fiber. (4) Conclusions: Resveratrol was well-loaded onto the diacetate fiber by SCF-CO2 assisted impregnation.

/pdf/resveratrol-loaded-diacetate-fiber-by-supercritical-co2-dfjg861g.pdf

Resveratrol-Loaded Diacetate Fiber by Supercritical CO2 Fluid Assisted Impregnation

In this paper, composite fiber membranes of cellulose acetate/chistosan (CA/CS) were prepared by electrospinning using two different injection methods involving co-injection and two-step injection. The antibacterial and micro-morphology properties of the CA/CS composite fiber membranes were also investigated. The results show that the optimum conditions of co-injection method were as follows: voltage 13 kV, flow rate 1.0 ml/h, and receiving distance 10 cm. For the two-step injection method, the voltage of 15 kV, flow rate of 1.0 ml/h, and receiving distance of 10 cm were adopted to prepare cellulose acetate membrane at first, and then, the chitosan liquid was injected into the cellulose acetate membrane under the condition of 13 kV voltage and 0.5 ml/h flow rate. The CA/CS composite fiber membrane prepared by the co-injection method had a better fibrous structure arrangement, smooth fiber surface, and uniform thickness, but the poor antibacterial effect was also indicated. However, the two-step injection method has excellent antibacterial effects. When the CS/PEO ratio is 9:1, composite fiber membrane has the best antibacterial property, but the fiber surface is not smooth enough.

Preparation and Properties Research on Electrostatic Spinning Acetate/Chitosan Composite Fiber

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Preparation and Properties Research on Electrostatic Spinning Acetate/Chitosan Composite Fiber