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Debarati Mitra

Bio: Debarati Mitra is an academic researcher from University of Calcutta. The author has contributed to research in topics: Pervaporation & Starch. The author has an hindex of 10, co-authored 29 publications receiving 328 citations. Previous affiliations of Debarati Mitra include Bidhan Chandra Krishi Viswavidyalaya.

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TL;DR: In this article , polyethylene glycol esters (PEGEs) were produced from different fatty acids derived from plant oils by enzymatic esterification reaction in a solvent-free system using commercially available immobilized Candida antarctica Lipase B (NS 435) biocatalyst.

1 citations

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TL;DR: In this paper , a mathematical model was developed to determine the component fluxes, separation factor and pervaporation separation index (PSI) considering the effects of different physico-chemical parameters (temperature, pressure, feed concentration), on the pervaporative separation of benzene from model pyrolysis gasoline (benzene/1-octene) with a fabricated insitu(nano)silver/polyvinyl alcohol membrane.
Abstract: Process simulators are commonly used for effective modeling, simulation, and optimization of separation techniques. A novel mathematical model was developed to determine the component fluxes, separation factor and pervaporation separation index (PSI) considering the effects of different physico-chemical parameters (temperature, pressure, feed concentration), on the pervaporative separation of benzene from model pyrolysis gasoline (benzene/1-octene) with a fabricated insitu(nano)silver/polyvinyl alcohol membrane. The simulation was done using MATLAB R2013 software. Estimation of PSI, the unique performance parameter, precisely provides the pervaporation separation efficiency. The maximum simulated and experimental PSI values for 0.3 mole fraction of benzene in feed at 303 K and 1 mm Hg downstream pressure are 14.25 kg/m2/h and 14.26 kg/m2/h, respectively. The error functions are presented in terms of Objective Function, Standard Deviation, Standard Error and Root Mean Square Error; all of them were ≪1. Good agreement between the experimental and simulated values endorsed the validity of the model.

1 citations

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TL;DR: In this article, a starch/PVA biocomposite reinforced with cellulose nanofibrils were prepared by solution casting method incorporating glycerol as a plasticizer, which was subjected to biodegradation in an aerobic compost pit.
Abstract: Starch/PVA biocomposite films reinforced with cellulose nanofibrils were prepared by solution casting method incorporating glycerol as a plasticizer. These biocomposite films along with unreinforced films were subjected to biodegradation in an aerobic compost pit. The extents of biodegradation of these films were studied in terms of persentage weight loss. The corresponding changes in the structures and properties of these biocomposites were investigated using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) study and Differential Scanning Calorimetry (DSC). The presence of fillers influenced the arrangement of the starch and PVA molecules in the film compared to that in the unreinforced film. A significant difference was observed in the nature of biodegradation of unreinforced and the reinforced films. The glass transition temperature, as observed from DSC, showed a decreasing trend, while the melting temperature showed an increasing trend after biodegradation. SEM micrographs revealed that the starch portions were consumed at a faster rate compared to polyvinyl alcohol, which was confirmed from XRD graphs also.

Cited by
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TL;DR: This book by a teacher of statistics (as well as a consultant for "experimenters") is a comprehensive study of the philosophical background for the statistical design of experiment.
Abstract: THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

13,333 citations

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TL;DR: This work discusses the main areas of nanocellulose research: photonics, films and foams, surface modifications, nanocomposites, and medical devices.

659 citations

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TL;DR: The increasing demand for new food packaging materials which satisfy people requirements provided thrust for advancement of nano-materials science as discussed by the authors, and the increasing need for new packaging materials with high barrier and barrier properties has driven the research and development in polymeric materials coupled with appropriate filler, matrix-filler interaction and new formulation strategies.

492 citations

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TL;DR: It is evident that fermentative production of chemicals and biopolymers via refining of waste and by-product streams is a highly important research area with significant prospects for industrial applications.
Abstract: The transition from a fossil fuel-based economy to a bio-based economy necessitates the exploitation of synergies, scientific innovations and breakthroughs, and step changes in the infrastructure of chemical industry. Sustainable production of chemicals and biopolymers should be dependent entirely on renewable carbon. White biotechnology could provide the necessary tools for the evolution of microbial bioconversion into a key unit operation in future biorefineries. Waste and by-product streams from existing industrial sectors (e.g., food industry, pulp and paper industry, biodiesel and bioethanol production) could be used as renewable resources for both biorefinery development and production of nutrient-complete fermentation feedstocks. This review focuses on the potential of utilizing waste and by-product streams from current industrial activities for the production of chemicals and biopolymers via microbial bioconversion. The first part of this review presents the current status and prospects on fermentative production of important platform chemicals (i.e., selected C2-C6 metabolic products and single cell oil) and biopolymers (i.e., polyhydroxyalkanoates and bacterial cellulose). In the second part, the qualitative and quantitative characteristics of waste and by-product streams from existing industrial sectors are presented. In the third part, the techno-economic aspects of bioconversion processes are critically reviewed. Four case studies showing the potential of case-specific waste and by-product streams for the production of succinic acid and polyhydroxyalkanoates are presented. It is evident that fermentative production of chemicals and biopolymers via refining of waste and by-product streams is a highly important research area with significant prospects for industrial applications.

431 citations

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339 citations