Construction of size-controllable gold nanoparticles immobilized on polysaccharide nanotubes by in situ one-pot synthesis

Triple-Helix Conformation of a Polysaccharide Determined with Light Scattering, AFM, and Molecular Dynamics Simulation

“…Herein, the α value of 1.6 was much higher than those of some stiff polysaccharides, such as lentinan (1.31) and xanthan (1.14), suggesting the super rigid chain conformation of BFP. Similarly, the relationship between R g and M w of BFP fractions ( R g = K′M w α′ ) was established as follows: Based on the theory of polymer solution, the exponent α′ values of 0.33, 0.50–0.6, and 1.0 reflect the chain shapes of sphere, random coil, and rigid rod, respectively . Here, the α′ value of 0.9 also indicated that BFP existed as a rigid chain in water, consistent with the conclusion from the Mark–Houwink equation.…”

“…(nm) g 4 w 0.9 (6) Based on the theory of polymer solution, the exponent α′ values of 0.33, 0.50−0.6, and 1.0 reflect the chain shapes of sphere, random coil, and rigid rod, respectively. 33 Here, the α′ value of 0.9 also indicated that BFP existed as a rigid chain in water, consistent with the conclusion from the Mark− Houwink equation. As is well-known, Yamakawa et al have put forward a series of formulas based on the wormlike and even helical wormlike chains model (HW) to evaluate the stiffness of macromolecules through conformational parameters, such as the molar mass per unit contour length (M L ) and the persistence length (q), obtained by tedious calculation.…”

“…In our laboratory, a white cotton-like polysaccharide was extracted from black fungus, which demonstrated significant antitumor activity depending on its molecular weight . Moreover, the polysaccharide could self-assemble into hollow nanofibers in water, which could be used as carriers for drugs, dyes, and metal nanoparticles. − It was inferred that the polysaccharide is a stiff chain from our primary studies, but it is hard to clarify the chain conformation from those limited data. Therefore, a detailed investigation of the chain conformation for this polysaccharide is essential for successful interpretation of their bioactivities and self-assembling behaviors as well as application in the biomedical field.…”

In Situ Synthesis of Au Nanoparticles on Viscose Cellulose Sponges for Antibacterial Activities

“…Meanwhile many previous studies have also shown similar results. The improvement of thermostability was attributed to the strong binding interaction between AuNPs and reducing polysaccharide [46,47].…”

In Situ Self-Assembly of Ultrastable Gold Nanoparticles on Polyvinyl Alcohol Nanofibrous Mats for Use as Highly Reusable Catalysts

“…Therefore, stabilization is essential to immobilize Au NPs and prevent their aggregation in most applications, particularly in catalysis. Stabilization has been facilitated by the use of numerous carrier systems such as high surface area, high-porosity materials [e.g., zeolites and mesoporous silica (SBA)], two-dimensional nanomaterials (e.g., graphene oxide), and a variety of molecules (e.g., surfactants and dendrimers). − Recently, environmentally benign polymer nanofibers have attracted considerable interest as Au NP stabilization carriers because of their high porosity, high surface area to volume ratios, and degradability in the environment. − Compared to other high surface area and high-porosity materials employed as Au NP stabilization carriers for catalytic applications, electrospun polymer nanofibers can provide a larger number of active sites, for example, −SH, −COOH, and −NH 3+ for stabilizing Au NPs and are much easier for fabrication. − This results in a great variety of interactions for immobilizing Au NPs on nanofiber surfaces to form polymer/Au NP composite nanofibers, which have been prepared via the in situ reduction of HAuCl 4 carried by polymer nanofibers. For example, Fang et al demonstrated the immobilization of Au NPs on the surfaces of water-stable composite polyvinyl acetate and polyethyleneimine nanofibrous mats .…”