Starch degradation

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  • Polyethylene-starch blend polymer has already found to be a potential candidate to replace non-degradable plastic in packaging [7]. However, the degradation of that polymer in natural ambience (soil burial test) needs to be further evaluated. The purpose of this study is to investigate the degradability of PE-starch blend polymer in soil and in liquid medium. The soil is added starch degrading bacteria isolated from natural soil.

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  • Research in starch biosynthesis is likely to have a great impact on agriculture and industry in coming years. Although the original purpose of research into starch synthesis was not industrial application, it is an example of how science, while trying to answer fundamental questions, may lead to the manipulation of nature for beneficial purposes. Although the basic studies of starch synthesis were carried out in England during the 1940s, and led to the discovery of phosphorylase and Q-enzyme (branching enzyme), the basis of our modern ideas originated in Argentina from the work of Luis F.

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  • After two centuries of almost absolute belief in technical and economic progress, human society is in a period of reconsideration and elaboration of new strategies for the ongoing new century. Progress of our civilization with an explosive rise in world population has led to an enormously increased con- sumption of resources and to an equal threat to the environment. Coping with these problems requires all intellectual abilities of our society. In this endeav- or, biotechnology is considered to play a significant role.

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  • The rising incidence of invasive species displacing endemics and altering water chemistry and local foodwebs increasingly affects freshwater systems and should be considered a water quality problem (Carr and Neary 2008). Aquatic species have in many cases been introduced deliberately into distant ecosystems for recreational, economic, or other purposes. In many instances, these introductions have decimated endemic fish and other aquatic organisms, and they can also degrade local watersheds.

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  • Approximately 10% of amylolytic enzymes are able to bind and degrade raw starch. Usually a distinct domain, the starch-binding domain (SBD), is responsible for this property. These domains have been classified into families of carbohydrate-binding modules (CBM). At present, there are six SBD families: CBM20, CBM21, CBM25, CBM26, CBM34, and CBM41.

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  • In recent years, much attention has been focused on making polyethylene degradable. The purpose of this work is to make degradable film from depolymerized tapioca starch and linear- low-density polyethylene (LLDPE) grafted with anhydride maleic (MA), using peroxide benzoyl as initiator and peanut oil as compatibilizer.

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  • Some starch-degrading enzymes accommodate carbohydrates at sites situ-ated at a certain distance from the active site. In the crystal structure of barleya-amylase 1, oligosaccharide is thus bound to the ‘sugar tongs’ site. This site on the non-catalytic domain C in the C-terminal part of the mole-cule contains a key residue, Tyr380, which has numerous contacts with the oligosaccharide.

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  • We briefly review the metabolism of the chloroplast stroma, and describe the structural modelling technique of elementary modes analysis. The technique is applied to a model of chloroplast metabolism to investigate viable pathways in the light, in the dark, and in the dark with the addition of sedoheptulose-1,7-bisphosphatase (nor-mally inactive in the dark).

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  • Dextrin sản xuất bởi nhiệt còn được gọi là pyrodextrins. During roasting under acid condition the starch hydrolyses and short chained starch parts partially rebranches with α-(1,6) bonds to the degraded starch molecule. [ 4 ] Trong rang trong điều kiện acid tinh bột thủy phân và ngắn xích tinh bột phần phần rebranches với α-(1,6) trái phiếu đến suy thoái tinh bột phân tử.

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  • The technological conditions of obtaining the polylactic acid-Vietnamese cassava starch blend on the mix-brabender were investigated. The optimal conditions were: temperature 160o C, reaction time 6 minutes, screw speed 45 r/min., initial material ratio in weight percentage PLA80- PEG10-TB20. Polyethyleneglycol (PEG) as a plasticizer, PN-47 as a distribution agent was used. It showed that the optimal starch content was 20 wt%. Increase in starch content lead to increase in water absorbability and weight loss of the materials.

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