The present work describes synthesis of copper alginate-cotton cellulose (CACC) composite fibers ... more The present work describes synthesis of copper alginate-cotton cellulose (CACC) composite fibers and detailed investigation of antimicrobial action against the model bacteria E.coli. The CACC fibers were prepared by immersing cotton fibers in aqueous solution of sodium alginate, followed by ionic crosslinking of alginate chains within the cotton cellulose fibers with Cu(II) ions to yield CACC composite fibers. The resulting CACC fibers were investigated for their biocidal action against E.coli, by using zone inhibition and colonies counting method. Finally, CACC fibers were reduced with sodium borohydride to yield copper nanoparticles-loaded composite fibers and investigated for biocidal action. It was found that CACC fibers possessed both, the fair mechanical strength and antibacterial action. The extent of biocidal action was found to depend upon the amount of Cu(II) loaded and concentration of alginate into cotton- cellulose fibers. The fibers showed higher Cu(II) release in phys...
Regenerated cellulose/poly(acrylic acid) composite films have been synthesized for wound dressing... more Regenerated cellulose/poly(acrylic acid) composite films have been synthesized for wound dressing applications. The water absorbency of these films was studied as a function of amount of cross-linker N,N′-methylenebisacrylamide and cellulose contents in the feed mixture. The samples, having different compositions, showed tensile strength and percent elongation in the range of 9.98×105 to 13.40×105 N/m2 and 110 to 265, respectively. The water vapor transmission rate (WVTR) for various films was found to be in the range of 2.03 to 7.18 mg/cm2/h. These films were loaded with antibacterial drug miconazole nitrate and their release was studied in the physiological pH at 37°C. The release data was found to fit well the diffusion controlled Higuchi model. Finally the films demonstrated fair antibacterial and antifungal action, thus establishing their strong candidature as wound dressing materials.
The low cost adsorbent, spent tea leaves (STL) has been tested for the effectiveness in decoloriz... more The low cost adsorbent, spent tea leaves (STL) has been tested for the effectiveness in decolorization of wastewater containing crystal violet dye in batch experiments. Effect of various parameters such as agitation time, pH, temperature and adsorbent dose has been investigated. The dye uptake has been found to increase with pH and temperature. The kinetic uptake data, obtained at different sorbate concentrations, is best interpreted by pseudo second order model and rate constants for adsorption are found to be 8.5 × 10-3, 22.2 × 10-3 and 42.0 × 10-3 g mg-1 min-1 for initial dye concentrations of 10, 20 and 30 mg L-1 respectively. The dye uptake was found to increase with temperature and the activation energy for adsorption process was found to be 10.45 ± 0.89 kJ mol-1.
Summary Carboxymethylcellulose (CMC, DSCM = 1) was partially hydrophobized in order to prepare p... more Summary Carboxymethylcellulose (CMC, DSCM = 1) was partially hydrophobized in order to prepare polymeric surfactants by the transesterification reaction using the methyl ester of the fatty acid complex of rapeseed oil (MERO). The chemical modification was performed in different reaction media (i) DMF/TSA and (ii) H2O/DMF with and without K2CO3 as catalyst, at various reaction conditions and using microwave radiation with
... V. Chaurasia a , Navin Chand b & SK Bajpai a pages 309-317. ... Singh, M., Singh, S.,... more ... V. Chaurasia a , Navin Chand b & SK Bajpai a pages 309-317. ... Singh, M., Singh, S., Prasad, S. and Gambhir, IS 2008. Digest J. Nanometer Biostructures , 3(3): 115–120. [Web of Science ®] View all references) has become a serious problem in public health. ...
A novel chitosan–Ca3V10O28 complex membrane with sustained antimicrobial capability was prepared ... more A novel chitosan–Ca3V10O28 complex membrane with sustained antimicrobial capability was prepared by the self-assembly of V10O286- and chitosan, using Ca2+ as the linker. The complex membrane was characterized by means of FT-IR, TG-DSC, X-ray diffraction, SEM and elemental analysis. It is shown that Ca3V10O28 is evenly present on the surface of chitosan–Ca3V10O28 complex membrane in the form of amorphous crystal.
The present work describes synthesis of copper alginate-cotton cellulose (CACC) composite fibers ... more The present work describes synthesis of copper alginate-cotton cellulose (CACC) composite fibers and detailed investigation of antimicrobial action against the model bacteria E.coli. The CACC fibers were prepared by immersing cotton fibers in aqueous solution of sodium alginate, followed by ionic crosslinking of alginate chains within the cotton cellulose fibers with Cu(II) ions to yield CACC composite fibers. The resulting CACC fibers were investigated for their biocidal action against E.coli, by using zone inhibition and colonies counting method. Finally, CACC fibers were reduced with sodium borohydride to yield copper nanoparticles-loaded composite fibers and investigated for biocidal action. It was found that CACC fibers possessed both, the fair mechanical strength and antibacterial action. The extent of biocidal action was found to depend upon the amount of Cu(II) loaded and concentration of alginate into cotton- cellulose fibers. The fibers showed higher Cu(II) release in phys...
Regenerated cellulose/poly(acrylic acid) composite films have been synthesized for wound dressing... more Regenerated cellulose/poly(acrylic acid) composite films have been synthesized for wound dressing applications. The water absorbency of these films was studied as a function of amount of cross-linker N,N′-methylenebisacrylamide and cellulose contents in the feed mixture. The samples, having different compositions, showed tensile strength and percent elongation in the range of 9.98×105 to 13.40×105 N/m2 and 110 to 265, respectively. The water vapor transmission rate (WVTR) for various films was found to be in the range of 2.03 to 7.18 mg/cm2/h. These films were loaded with antibacterial drug miconazole nitrate and their release was studied in the physiological pH at 37°C. The release data was found to fit well the diffusion controlled Higuchi model. Finally the films demonstrated fair antibacterial and antifungal action, thus establishing their strong candidature as wound dressing materials.
The low cost adsorbent, spent tea leaves (STL) has been tested for the effectiveness in decoloriz... more The low cost adsorbent, spent tea leaves (STL) has been tested for the effectiveness in decolorization of wastewater containing crystal violet dye in batch experiments. Effect of various parameters such as agitation time, pH, temperature and adsorbent dose has been investigated. The dye uptake has been found to increase with pH and temperature. The kinetic uptake data, obtained at different sorbate concentrations, is best interpreted by pseudo second order model and rate constants for adsorption are found to be 8.5 × 10-3, 22.2 × 10-3 and 42.0 × 10-3 g mg-1 min-1 for initial dye concentrations of 10, 20 and 30 mg L-1 respectively. The dye uptake was found to increase with temperature and the activation energy for adsorption process was found to be 10.45 ± 0.89 kJ mol-1.
Summary Carboxymethylcellulose (CMC, DSCM = 1) was partially hydrophobized in order to prepare p... more Summary Carboxymethylcellulose (CMC, DSCM = 1) was partially hydrophobized in order to prepare polymeric surfactants by the transesterification reaction using the methyl ester of the fatty acid complex of rapeseed oil (MERO). The chemical modification was performed in different reaction media (i) DMF/TSA and (ii) H2O/DMF with and without K2CO3 as catalyst, at various reaction conditions and using microwave radiation with
... V. Chaurasia a , Navin Chand b & SK Bajpai a pages 309-317. ... Singh, M., Singh, S.,... more ... V. Chaurasia a , Navin Chand b & SK Bajpai a pages 309-317. ... Singh, M., Singh, S., Prasad, S. and Gambhir, IS 2008. Digest J. Nanometer Biostructures , 3(3): 115–120. [Web of Science ®] View all references) has become a serious problem in public health. ...
A novel chitosan–Ca3V10O28 complex membrane with sustained antimicrobial capability was prepared ... more A novel chitosan–Ca3V10O28 complex membrane with sustained antimicrobial capability was prepared by the self-assembly of V10O286- and chitosan, using Ca2+ as the linker. The complex membrane was characterized by means of FT-IR, TG-DSC, X-ray diffraction, SEM and elemental analysis. It is shown that Ca3V10O28 is evenly present on the surface of chitosan–Ca3V10O28 complex membrane in the form of amorphous crystal.
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