Structure of gum arabic in aqueous solution

2006 ◽  
Vol 44 (22) ◽  
pp. 3265-3271 ◽  
Author(s):  
Yael Dror ◽  
Yachin Cohen ◽  
Rachel Yerushalmi-Rozen
Keyword(s):  
Aqueous Solution ◽  
Gum Arabic

Radiation-induced polymerization of gum arabic (Acacia senegal) in aqueous solution

2006 ◽  
Vol 20 (7) ◽  
pp. 983-989 ◽  
Author(s):  
Tsuyoshi Katayama ◽  
Makoto Nakauma ◽  
Setsuko Todoriki ◽  
Glyn O. Phillips ◽  
Mikiro Tada
Keyword(s):  
Aqueous Solution ◽  
Gum Arabic ◽  
Acacia Senegal ◽  
Radiation Induced

Fluorescence spectral studies of Gum Arabic: Multi-emission of Gum Arabic in aqueous solution

2014 ◽  
Vol 155 ◽  
pp. 322-329 ◽  
Author(s):  
Namasivayam Dhenadhayalan ◽  
Rajan Mythily ◽  
Rajendran Kumaran
Keyword(s):  
Aqueous Solution ◽  
Gum Arabic ◽  
Spectral Studies

In Situ, Real-Time FT-IR/CIR/ATR Study of the Biocorrosion of Copper by Gum Arabic, Alginic Acid, Bacterial Culture Supernatant and Pseudomonas atlantica Exopolymer

1989 ◽  
Vol 43 (6) ◽  
pp. 1062-1067 ◽  
Author(s):  
John G. Jolley ◽  
Gill G. Geesey ◽  
Michael R. Hankins ◽  
Randy B. Wright ◽  
Paul L. Wichlacz
Keyword(s):  
Aqueous Solution ◽  
Real Time ◽  
Culture Supernatant ◽  
Bacterial Culture ◽  
Alginic Acid ◽  
Gum Arabic ◽  
Bacterial Culture Supernatant ◽  
Ft Ir ◽  
Simulated Seawater

Thin films (2.0 nm) of copper on germanium internal reflection elements (IREs) were exposed to 10% gum arabic (aqueous solution), 2% alginic acid (aqueous solution), 1% bacterial culture supernatant (BCS, simulated seawater solution), and 0.5% Pseudomonas atlantica exopolymer (simulated seawater solution) and monitored in situ, real time, with the use of Fourier transform infrared/cylindrical internal reflection/attenuated total reflection spectroscopy as a function of time at ambient conditions. Ancillary graphite furnace atomic absorption spectroscopy was used to monitor the removal process of the copper thin film from the germanium IREs. Results indicate that some of the copper was removed from the Cu/Ge interface by all four polymers and incorporated into the polymer matrix. Thus, biocorrosion of copper was exhibited by the four polymers in the order of alginic acid < gum arabic < BCS > Pseudomonas atlantica exopolymer. The FT-IR/CIR/ATR technique can be successfully used to monitor biocorrosion systems in in situ, real-time settings.

Preparation of PLA and PLGA Magnetic Microspheres with T-Shaped Microchannel Reactor

2014 ◽  
Vol 609-610 ◽  
pp. 425-429 ◽  
Author(s):  
Peng Liu ◽  
Yi Zhong ◽  
Yan Luo
Keyword(s):  
Aqueous Solution ◽  
Solvothermal Method ◽  
Gum Arabic ◽  
Magnetic Microspheres ◽  
Microchannel Reactor ◽  
Characteristic Functional ◽  
Dichloromethane Solution ◽  
New Approach ◽  
Ft Ir ◽  
Uniform Particle Size

Monodisperse magnetic microspheres with biomaterial of polylactic acid (PLA) or poly lactic-co-glycolic acid (PLGA) as shell were successfully prepared via T-shaped microchannel reactor in this paper. Hydrophilic ferriferrous oxide (Fe3O4) with highly magnetic responsiveness was obtained by solvothermal method. Aqueous solution of Fe3O4 was then emulsified into a dichloromethane solution of PLA or PLGA to generate water-in-oil (W/O) emulsion. Different stabilizer, i.e. polyvinyl alcohol (PVA), gelatin or gum arabic, was then added into the W/O emulsion for the purpose of more stable system. Subsequently, W/O/W composite emulsion was formed by injecting W/O emulsion into PVA aqueous solution at the T-shaped joint of microchannel reactor. Magnetic microspheres were finally prepared by solvent evaporation in the microchannel. The characteristic functional groups of Fe3O4 were characterized by Fourier transform infrared spectroscopy (FT-IR). The magnetic property was measured with vibrating sample magnetometer (VSM). The morphology of all samples was observed by scanning electron microscopy (SEM). It was found that the magnetic microspheres exhibit a uniform particle size in micro-scale. Therefore, the T-shaped microchannel reactor was expected to create a new approach for fabricating magnetic microspheres.

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

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