tempo and sodium-perchlorate

tempo has been researched along with sodium-perchlorate* in 2 studies

Other Studies

2 other study(ies) available for tempo and sodium-perchlorate

Article	Year
Fast and continuous preparation of high polymerization degree cellulose nanofibrils and their three-dimensional macroporous scaffold fabrication. Nanoscale, 2013, Mar-21, Volume: 5, Issue:6 C6-carboxy-cellulose with a carboxylate content of 0.8 mmol g(-1) was obtained by oxidation of once-dried cellulose, using the 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)/NaClO/NaClO2 system at pH 6.8 and 60 °C for 16 h. This method, with the addition of reagents in the order TEMPO, NaClO and NaClO2, was 38 h faster than a previously published method. Individualized cellulose nanofibrils with a width of 3-5 nm and a length of several hundred nanometers were prepared by homogenizing the C6-carboxy-cellulose-water suspension. Macroporous cellulose nanofibril/poly(vinyl alcohol) scaffolds with interconnected large pores of 20-100 μm diameter and small pores of 2-10 μm diameter were fabricated. The cellulose nanofilaments formed nanofibrous structures on the surface of the PVA wall, which was similar to that of the collagen skeleton of the extracellular matrix. NIH/3T3 cells were cultured in the scaffolds for 4 weeks, SEM observation showed that the cells were anchored and clustered on the cellulose nanofilaments, forming spherical colonies. The extracellular matrix (ECM) was filled with mineralized particles. Topics: Animals; Cellulose; Chlorates; Collagen; Cyclic N-Oxides; Hydrogen-Ion Concentration; Materials Testing; Mice; Nanofibers; NIH 3T3 Cells; Perchlorates; Polyvinyl Alcohol; Sodium Compounds; Tissue Scaffolds	2013
Study on TEMPO-mediated selective oxidation of hyaluronan and the effects of salt on the reaction kinetics. Carbohydrate research, 2000, Aug-07, Volume: 327, Issue:4 2,2,6,6-Tetramethyl-1-piperidinyloxy radical (TEMPO)-mediated oxidation of hyaluronan was studied at pH 10.2 and temperature of 0 degrees C with NaOCl as the primary oxidant. As with other polysaccharides, a high selectivity of oxidation was observed. The degradation of the polymer was essentially caused by the oxidation process. The primary oxidant and the pH of the reaction mixture did not alter the molecular weight of hyaluronan during oxidation. The kinetics of the oxidation process was investigated at different concentrations of reactants and the inorganic salts, NaBr, NaCl, and Na2SO4. An increase in the salt concentration in the mixture causes a major decrease in the rate of the oxidation, and this decrease is independent of the nature of the salt. Topics: Catalysis; Cyclic N-Oxides; Dose-Response Relationship, Drug; Hyaluronic Acid; Hydrogen-Ion Concentration; Kinetics; Magnetic Resonance Spectroscopy; Molecular Weight; Oxidation-Reduction; Perchlorates; Salts; Sodium Compounds; Spectrophotometry, Infrared; Spin Labels; Temperature	2000

Article

Year

Fast and continuous preparation of high polymerization degree cellulose nanofibrils and their three-dimensional macroporous scaffold fabrication.

Nanoscale, 2013, Mar-21, Volume: 5, Issue:6

C6-carboxy-cellulose with a carboxylate content of 0.8 mmol g(-1) was obtained by oxidation of once-dried cellulose, using the 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)/NaClO/NaClO2 system at pH 6.8 and 60 °C for 16 h. This method, with the addition of reagents in the order TEMPO, NaClO and NaClO2, was 38 h faster than a previously published method. Individualized cellulose nanofibrils with a width of 3-5 nm and a length of several hundred nanometers were prepared by homogenizing the C6-carboxy-cellulose-water suspension. Macroporous cellulose nanofibril/poly(vinyl alcohol) scaffolds with interconnected large pores of 20-100 μm diameter and small pores of 2-10 μm diameter were fabricated. The cellulose nanofilaments formed nanofibrous structures on the surface of the PVA wall, which was similar to that of the collagen skeleton of the extracellular matrix. NIH/3T3 cells were cultured in the scaffolds for 4 weeks, SEM observation showed that the cells were anchored and clustered on the cellulose nanofilaments, forming spherical colonies. The extracellular matrix (ECM) was filled with mineralized particles.

Topics: Animals; Cellulose; Chlorates; Collagen; Cyclic N-Oxides; Hydrogen-Ion Concentration; Materials Testing; Mice; Nanofibers; NIH 3T3 Cells; Perchlorates; Polyvinyl Alcohol; Sodium Compounds; Tissue Scaffolds

2013

Study on TEMPO-mediated selective oxidation of hyaluronan and the effects of salt on the reaction kinetics.

Carbohydrate research, 2000, Aug-07, Volume: 327, Issue:4

2,2,6,6-Tetramethyl-1-piperidinyloxy radical (TEMPO)-mediated oxidation of hyaluronan was studied at pH 10.2 and temperature of 0 degrees C with NaOCl as the primary oxidant. As with other polysaccharides, a high selectivity of oxidation was observed. The degradation of the polymer was essentially caused by the oxidation process. The primary oxidant and the pH of the reaction mixture did not alter the molecular weight of hyaluronan during oxidation. The kinetics of the oxidation process was investigated at different concentrations of reactants and the inorganic salts, NaBr, NaCl, and Na2SO4. An increase in the salt concentration in the mixture causes a major decrease in the rate of the oxidation, and this decrease is independent of the nature of the salt.

Topics: Catalysis; Cyclic N-Oxides; Dose-Response Relationship, Drug; Hyaluronic Acid; Hydrogen-Ion Concentration; Kinetics; Magnetic Resonance Spectroscopy; Molecular Weight; Oxidation-Reduction; Perchlorates; Salts; Sodium Compounds; Spectrophotometry, Infrared; Spin Labels; Temperature

2000