Huarong Nie

Effects of chain conformation and entanglement on the electrospinning of pure alginate.

As a natural biopolymer, sodium alginate (SA) has been widely used in the biomedical field in the form of powder, liquid, gel, and compact solid, but not in the form of nanofiber. Electrospinning is an effective method to fabricate nanofibers. However, electrospinning of SA from its aqueous solution is still a challenge. In this study, an effort has been made to solve this problem and find the key reasons that hinder the electrospinning of alginate aqueous solution. Through this research, it was found that pure SA nanofibers could be fabricated successfully by introducing a strong polar cosolvent, glycerol, into the SA aqueous solutions. The study on the properties of the modified SA solution showed that increasing glycerol content increased the viscosity of the SA solution greatly and, meanwhile, decreased the surface tension and the conductivity of the SA solution. The rheological results indicated that the increase in glycerol content could result in the enhanced entanglements of SA chains. Two schematic molecular models were proposed to depict the change of SA chain conformation in aqueous solution with and without glycerol. The main contribution of glycerol to the electrospinning process is to improve the flexibility and entanglement of SA chains by disrupting the strong inter- and intramolecular hydrogen bondings among SA chains, then forming new hydrogen bondings with SA chains.

Carrier system of chemical drugs and isotope from gelatin electrospun nanofibrous membranes.

School of Materials Science and Engineering, Nanchang University, Nanjing East Road 235, Nanchang 330047, China, State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China, and Key Laboratory of Rubber-Plastics (Ministry of Education), College of Polymer Science and Engineering, Qingdao University of Science and Technology, Q1 Qingdao 266042, China

Immobilization of radionuclides on poly(lactide-co-glycolide) nanofibrous membranes

In this work, electrospun poly(lactide-co-glycolide) (PLGA) fibrous membranes were functionalized with radionuclides by surface modification. After the introduction of chitosan and bifunctional ligands (DTPA) on soft hydrolyzed PLGA nanofibrous membranes, more than 80% of the radionuclides (90Y) in aqueous solutions were attached as labels to the target nanofibers. To get a high chelating efficiency without changing the physical properties of the membranes, the hydrolysis conditions, the reactive media for the introduction of DTPA, and the chelating time were thoroughly investigated. These radionuclide labelled PLGA fibrous membranes have similar mechanical properties as human tissues. 90Y on PLGA nanofibers shows a desirable stability of more than four half-lives.