Separation and purification of curcumin preparation of morphology controlled micro particles

Curcumin was extracted from turmeric plants which is the most commonly used natural pigments, and possess a variety of pharmacological functions except for using pigment. The morphology and particle size of curcumin are main factors affecting the application. Therefore, the morphology and particle size distribution of curcumin were effectively controlled by advanced technology, which is significant for expanding the application and added value of curcumin. The curcumin crystal was obtained from curcumin pigments by using column chromatography and recrystallization techniques. The composition and structure of curcumin were characterized by elementary analysis, UV-Vis, IR and NMR. Micronization of curcumin was carried out the Solution Enhanced Dispersion by Supercritical Fluids (SEDS) technology. In the process, supercritical carbon dioxide was used as anti-solvent and acetone/dichloromethane (1:4, v:v) was used as solvent. The curcumin crystals with PSs of about 378 μm were successfully micronized by the SEDS process to micro particles with PSs of about 2.6-10 μm. The acicular, leaves, dendritic and tubular micro particles were obtained through controlling parameters such as pressure, temperature, solution concentration and solution flow rate.DOI: http://doi.dx.org/10.5564/mjc.v15i0.314 Mongolian Journal of Chemistry  15 (41), 2014, p11-1

DEGRADATION ISSUES OF FESCUE-FORBS RANGELAND IN MOUNTAIN STEPPE

The total area of Fescue-forbs rangeland in Mongolia is 10 million hectares, in account of 8.5% of total rangeland area. Fescue-forbs rangeland is the main type of rangeland in mountain steppe. The Mongolian rangeland has degraded for the last decades mainly due to overgrazing and climate change. The main objective of this study is to determine the change of plant community and reduction of abundance and productivity of dominant species Festuca lenensis in different degradation levels. The dominant species and main plant functional groups were completely changed in Fescue-forbs rangeland in compared with three degradation levels. The cover of Festuca lenensis was decreased by 98.6-99.5% and biomass percentage was decreased by 95.3-100% in three different degradation levels compared with no degraded pasture. Regarding the results of species composition, the highest number of species reached in moderately degraded pasture, lowest number of species reached in heavily degraded pasture. The species similarity coefficient=0.45 between slightly and moderately degraded pastures. Heavily degraded pasture was different from other two pastures. Quantity of individual species increased in moderately and heavily degraded pastures compared with slightly degraded site. It has depended on increaser and tolerant plant species, these are Arenaria capillaris, Potentilla acaulis, Artemisia frigida, A.commutata, Chamaerodos erecta and Carex duriuscula. Our study to reveal a degradation process of Fescue-forbs rangeland in mountain steppe of Mongolia

Antimicrobial nano-Ag-TiO2 coating for lining leather

In this study, the characterization and the antimicrobial properties of nanosized Ag-TiO2 coatings on leather were investigated. For this purpose, turbidity, viscosity and pH of nAg-TiO2 solutions prepared by the sol-gel method were measured. The surface morphology of treated leathers was observed using Scanning Electron Microscopy (SEM) and the elemental analysis was performed by energy dispersive spectrometer (EDS). The antimicrobial performance of nAg-TiO2 coatings on leather materials to the test microorganisms as Escherichia coli, Staphylococcus aureus, Candida albicans and Aspergillius niger was evaluated by the application of qualitative (Agar overlay method) and quantitative (percentage of microbial reduction) tests. According to qualitative test results it was found that 2% and higher concentrations of nAg-TiO2 on the leather samples were effective against all microorganisms tested. Moreover, quantitative test results showed that leather samples treated with 5% of nAg-TiO2 demonstrated the highest antibacterial activity against E. coli with 93.50% bacterium removal, whereas 2% of nAg-TiO2 on leather was enough to exhibit the excellent percentage reduction against S. aureus of 99.99%. The results are promising for the use of colloidal nano Ag-TiO2 solution on lining leather as antimicrobial coating. © 2016 University of Bucharest

New gelatin-hydroxyapatite nanocomposite films containing nano silver: Synthesis, and, mechanical and antimicrobial properties

A new gelatin-hydroxyapatite (GHA) nanocomposite with different amounts of nanosilver (nAg) has been obtained by a colloidal chemical route. The AFM results revealed that the particle size of nAg particles was less than 20 nm. The morphology of the prepared hydroxyapatite (HA) powder was investigated by X-ray diffraction (XRD). The nanocomposite films were characterized by FT-IR spectroscopy, showing the interaction of the GHA with nAg. Mechanical properties and antimicrobial effects against the test microorganisms, bacteria E.coli and S. aureus and fungi C. albicans, A. niger and T. viridae, were also studied. The results obtained showed that the antimicrobial effects of the nanocomposite films as well as their mechanical properties like tensile strength and elongation at break are improved by increasing the amount of nano Ag from 10 to 50 ppm. Therefore, this material is a promising biomaterial to use in food, pharmaceutical and medical applications, etc. Copyright © 2011 American Scientific Publishers

Antimicrobial Nano-Ag-TiO2 Coating for Lining Leather

In this study, the characterization and the antimicrobial properties of nanosized Ag-TiO2 coatings on leather were investigated. For this purpose, turbidity, viscosity and pH of nAg-TiO2 solutions prepared by the sol-gel method were measured. The surface morphology of treated leathers was observed using Scanning Electron Microscopy (SEM) and the elemental analysis was performed by energy dispersive spectrometer (EDS). The antimicrobial performance of nAg-TiO2 coatings on leather materials to the test microorganisms as Escherichia coli, Staphylococcus aureus, Candida albicans and Aspergillius niger was evaluated by the application of qualitative (Agar overlay method) and quantitative (percentage of microbial reduction) tests. According to qualitative test results it was found that 2% and higher concentrations of nAg-TiO2 on the leather samples were effective against all microorganisms tested. Moreover, quantitative test results showed that leather samples treated with 5% of nAg-TiO2 demonstrated the highest antibacterial activity against E. coli with 93.50% bacterium removal, whereas 2% of nAg-TiO2 on leather was enough to exhibit the excellent percentage reduction against S. aureus of 99.99%. The results are promising for the use of colloidal nano Ag-TiO2 solution on lining leather as antimicrobial coating

Antimicrobial nano-Ag-TiO2 coating for lining leather

© 2016 University of Bucharest.In this study, the characterization and the antimicrobial properties of nanosized Ag-TiO2 coatings on leather were investigated. For this purpose, turbidity, viscosity and pH of nAg-TiO2 solutions prepared by the sol-gel method were measured. The surface morphology of treated leathers was observed using Scanning Electron Microscopy (SEM) and the elemental analysis was performed by energy dispersive spectrometer (EDS). The antimicrobial performance of nAg-TiO2 coatings on leather materials to the test microorganisms as Escherichia coli, Staphylococcus aureus, Candida albicans and Aspergillius niger was evaluated by the application of qualitative (Agar overlay method) and quantitative (percentage of microbial reduction) tests. According to qualitative test results it was found that 2% and higher concentrations of nAg-TiO2 on the leather samples were effective against all microorganisms tested. Moreover, quantitative test results showed that leather samples treated with 5% of nAg-TiO2 demonstrated the highest antibacterial activity against E. coli with 93.50% bacterium removal, whereas 2% of nAg-TiO2 on leather was enough to exhibit the excellent percentage reduction against S. aureus of 99.99%. The results are promising for the use of colloidal nano Ag-TiO2 solution on lining leather as antimicrobial coating