scholarly journals RAFT Aqueous Dispersion Polymerization ofN-(2-(Methacryloyloxy)ethyl)pyrrolidone: A Convenient Low Viscosity Route to High Molecular Weight Water-Soluble Copolymers

2016 ◽  
Vol 49 (12) ◽  
pp. 4520-4533 ◽  
Author(s):  
Victoria J. Cunningham ◽  
Matthew J. Derry ◽  
Lee A. Fielding ◽  
Osama M. Musa ◽  
Steven P. Armes
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Dispersion Polymerization ◽  
Aqueous Dispersion ◽  
Water Soluble ◽  
Low Viscosity

Synthetic Polymers in Water-in-Oil Microemulsions

1989 ◽  
Vol 171 ◽  
Author(s):  
Francoise Candau
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Reverse Micelles ◽  
Synthetic Polymers ◽  
Water Soluble ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Low Viscosity ◽  
Oil Emulsions ◽  
Stable Particles

ABSTRACTHigh molecular weight water-soluble polymers are usually supplied in the form of water-in-oil emulsions which have advantages of low viscosity and easy storage and dissolution. Most uses in water treatment, flocculation, paper manufacture or mining fields require polymer latexes formed of finely dipersed particles. Polymerization in reverse micelles or microemulsions appears to be an attractive technique because it can lead, under appropriate formulations, to high molecular weight polymers entrapped within small-sized stable particles. The main characteristics and properties of the latexes and polymers formed by this process are described.

Effect of High Molecular Weight Water-Soluble Chitosan on the Trabecular Bone and Thickness in Ovariectomized Rats

2007 ◽  
Vol 29 (3-4) ◽  
pp. 439-449 ◽  
Author(s):  
Han-Jung Chae ◽  
Geun-Youn Lee ◽  
Sun-Kyung Yang ◽  
Do-Sung Kim ◽  
Ki-Jung Yun ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Trabecular Bone ◽  
High Molecular Weight ◽  
Water Soluble ◽  
Ovariectomized Rats

Interaction of Streptococcus mutans Glucosyltransferases with Teichoic Acids

1980 ◽  
Vol 29 (2) ◽  
pp. 376-382
Author(s):  
H. K. Kuramitsu ◽  
L. Wondrack ◽  
M. McGuinness
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Streptococcus Mutans ◽  
Teichoic Acid ◽  
Lipoteichoic Acid ◽  
Water Soluble ◽  
Heat Inactivation ◽  
Teichoic Acids ◽  
Insoluble Glucan

The Streptococcus mutans GS5 glucosyltransferase activities (both water-soluble and -insoluble glucan-synthesizing fractions) were inhibited by purified lipoteichoic acid. In vitro sucrose-dependent colonization of smooth surfaces by strain GS5 was also markedly reduced in the presence of the amphipathic molecules. The inhibition of soluble glucan synthesis by lipoteichoic acid appeared to be competitive with respect to both sucrose and primer dextran T10. These inhibitory effects were dependent on the presence of the fatty acid components of lipoteichoic acid since deacylated lipoteichoic acids did not inhibit glucosyltransferase activity. However, the deacylated molecules did interact with the enzymes since deacylated lipoteichoic acid partially protected the enzyme activity against heat inactivation and also induced the formation of high-molecular-weight enzyme complexes from the soluble glucan-synthesizing fraction. The presence of teichoic acid in high-molecular-weight aggregates of glucosyltransferase isolated from the culture fluids of strain GS5 was suggested by the detection of polyglycerophosphate in these fractions. In addition to strain GS5, two other organisms containing polyglycerophosphate teichoic acids, Lactobacillus casei and Lactobacillus fermentum , were demonstrated to bind glucosyltransferase activity. These results are discussed relative to the potential role of teichoic acid-glucosyltransferase interactions in enzyme binding to the cell surface of S. mutans and the formation of high-molecular-weight enzyme aggregates in the culture fluids of the organism.

scholarly journals Catalytic Degradation of Chitosan by Supported Heteropoly Acids in Heterogeneous Systems

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1078
Author(s):  
Hang Zhang ◽  
Zhipeng Ma ◽  
Yunpeng Min ◽  
Huiru Wang ◽  
Ru Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Weight ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Reaction Time ◽  
High Molecular Weight ◽  
Reaction Temperature ◽  
Water Soluble ◽  
High Catalytic Activity ◽  
High Molecular Weight Chitosan

Several kinds of composite materials with phosphotungstic acid (PTA) as the catalyst were prepared with activated carbon as support, and their structures were characterized. According to the Box–Behnken central combination principle, the mathematical model of the heterogeneous system is established. Based on the single-factor experiments, the reaction temperature, the reaction time, the amount of hydrogen peroxide and the loading capacity of PTA were selected as the influencing factors to study the catalyzed oxidation of hydrogen peroxide and degradation of high molecular weight chitosan. The results of IR showed that the catalyst had a Keggin structure. The results of the mercury intrusion test showed that the pore structure of the supported PTA catalyst did not change significantly, and with the increase of PTA loading, the porosity and pore volume decreased regularly, which indicated that PTA molecules had been absorbed and filled into the pore of activated carbon. The results of Response Surface Design (RSD) showed that the optimum reaction conditions of supported PTA catalysts for oxidative degradation of high molecular weight chitosan by hydrogen peroxide were as follows: reaction temperature was 70 ℃, reaction time was 3.0 h, the ratio of hydrogen peroxide to chitosan was 2.4 and the catalyst loading was 30%. Under these conditions, the yield and molecular weight of water-soluble chitosan were 62.8% and 1290 Da, respectively. The supported PTA catalyst maintained high catalytic activity after three reuses, which indicated that the supported PTA catalyst had excellent catalytic activity and stable performance compared with the PTA catalyst.

Research Note: The Central Domain of High Molecular Weight Glutenin Subunits is Water-Soluble

1999 ◽  
Vol 29 (2) ◽  
pp. 109-112 ◽  
Author(s):  
A.C.A.P.A. Bekkers ◽  
E. de Boef ◽  
A.A. van Dijk ◽  
R.J. Hamer
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Water Soluble ◽  
Research Note ◽  
Glutenin Subunits ◽  
Central Domain

Nitric oxide production by high molecular weight water-soluble chitosan via nuclear factor-κB activation

2000 ◽  
Vol 22 (11) ◽  
pp. 923-933 ◽  
Author(s):  
Hyun-Ja Jeong ◽  
Hyun-Na Koo ◽  
Eun-Young Oh ◽  
Han-Jung Chae ◽  
Hyung-Ryong Kim ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Nuclear Factor Κb ◽  
Water Soluble ◽  
Nitric Oxide Production ◽  
Nuclear Factor ◽  
Oxide Production
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