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Dibrugarh, India

Dibrugarh University is a university in the Indian state of Assam. It was set up in 1965 under the provisions of the Dibrugarh University Act, 1965, enacted by the Assam Legislative Assembly. It is a teaching-cum-affiliating university with limited residential facilities. Wikipedia.

Singh A.V.,Dibrugarh University
Journal of Thermal Analysis and Calorimetry | Year: 2013

The present investigation concerns with thermal analysis of biomaterials such as Chitosan, Xanthan gum, Guar gum Pectin, Karaya gum, Sodium alginate, and Psyllium husk mucilage. The DSC curve of the natural polymers showed its specific endothermic peaks and ΔH f values, and these will be helpful in determining the fitness of the polymers with active drug. The drug and natural polymer compatibility study is now one of the recognized methods for preformulation step in pharmaceutical drug development. All the natural polymers showed endothermic peak below 150 C, and this make them suitable with a wide class of therapeutic drugs. © 2012 Akadémiai Kiadó, Budapest, Hungary.

Gogoi A.,Dibrugarh University | Bora U.,Dibrugarh University
Tetrahedron Letters | Year: 2013

An ipso-hydroxylation of arylboronic acids to phenols using aqueous H 2O2 as oxidant and acidic alumina as catalyst has been reported in this study. The reusability of the catalyst is also investigated. © 2013 Elsevier Ltd. All rights reserved.

Singh A.V.,Dibrugarh University | Nath L.K.,Dibrugarh University
International Journal of Biological Macromolecules | Year: 2012

Highly substituted sago starch phosphate was synthesized using POCl 3 as cross-linking reagent. Titrimetric and Fourier transform infra red (FT-IR) spectral analysis were used to characterize the substitution. Studying the different factors affecting the reaction parameters showed that the optimal conditions for starch phosphorylation were: 4h reaction time and reagent concentration 1.5% (w/w). The physicochemical properties of cross-linked sago starch (CLSS) were done using Scanning electron micrograph (SEM), X-ray powder diffractometer (XRD and Thermogravimetric analysis (TGA). The results revealed that crystalline nature of native sago starch was transformed after cross-linking. TGA report exhibited higher thermal stability, which makes it suitable for various industrial applications. Swelling behavior showed high swelling at low temperature (30 and 60°C) as compared to high temperature (90°C). © 2011 Elsevier B.V.

Gogoi A.,Dibrugarh University | Bora U.,Dibrugarh University
Synlett | Year: 2012

A mild and efficient methodology for the ipso-hydroxylation of arylboronic acids to phenols has been developed using aqueous hydrogen peroxide as oxidizing agent and molecular iodine as catalyst. The reactions were performed at room temperature in short reaction time under metal-, ligand- and base-free conditions. © Georg Thieme Verlag Stuttgart · New York.

Gogoi S.B.,Dibrugarh University
Transport in Porous Media | Year: 2011

Surfactant loss due to adsorption on the porous medium of an oil reservoir is a major concern in enhanced oil recovery. Surfactant loss due to adsorption on the reservoir rock weakens the effectiveness of the injected surfactant in reducing oil-water interfacial tension (IFT) and making the process uneconomical. In this study, surfactant concentrations in the effluent of the corefloods and oil-water IFT were determined under different injection strategies. It was found that in an extended waterflood following a surfactant slug injection, surfactant desorbed in the water phase. This desorbed surfactant lasted for a long period of the waterflood. The concentration of the desorbed surfactant in the extended waterflood was very low but still an ultralow IFT was obtained by using a suitable alkali. Coreflood results show an additional recovery of 13. 3% of the initial oil in place was obtained by the desorbed surfactant and alkali. Results indicate that by utilizing the desorbed surfactant during the extended waterflood operation the efficiency and economics of the surfactant flood can be improved significantly. © 2011 Springer Science+Business Media B.V.

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