Dextran

Leathers, Timothy D.

doi:10.1002/3527600035.bpol5012

Cited by 13 publications

(3 citation statements)

References 140 publications

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“…It is believed that the condition of these batch experiments for bacterial growth and biopolymer production was consistent with that of the sand-pack because the silica sand used was clean without any solute or salt, and because the pore size of the sand-pack (∼20-40 μm) was much larger than the size of model bacteria (∼0.6-1 μm). This is corroborated by the fact that the dextran is extracellularly produced via enzymes secreted by L. mesenteroides (Leathers 2005). Assuming a density of 1.50 g=cm 3 (Noh et al 2016), the pore saturation of biopolymer dextran in each specimen was estimated from the triplicates; the results are presented in Table 1 and more details in Table S3.…”

Section: Quantification Of Quantity and Pore Saturation Of Dextranmentioning

confidence: 87%

Improvement of Surface Erosion Resistance of Sand by Microbial Biopolymer Formation

Ham

Chang

Noh

et al. 2018

J. Geotech. Geoenviron. Eng.

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Direct use of naturally occurring microbes for soil improvement has recently gained attention due to their ubiquitous and versatile characteristics in subsurface soil. Microbes produce soft and sticky extracellular polymeric substances (or biopolymers) that are known to alter the hydrological characteristics of soils; however, the mechanisms and extent of such soft biopolymers in altering soil erosion resistance remain scarcely explored. This study explored the role of microbial biopolymers in soil erosion resistance. The surface erosion resistance of sandy soils was evaluated by using a hybrid erosion function apparatus, in which the model bacteria Leuconostoc mesenteroides were stimulated to produce an insoluble biopolymer. The results revealed that the microbial biopolymer formation increased the critical shear stress and surface erosion resistance, which the researchers attributed to the increased cohesion by grain-coating biopolymer slimes and the reduced seepage flows due to pore clogging. This study provides baseline but promising results on how microbially grown biopolymers can be used to improve soil erosion resistance.

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Section: Quantification Of Quantity and Pore Saturation Of Dextranmentioning

confidence: 87%

Improvement of Surface Erosion Resistance of Sand by Microbial Biopolymer Formation

Ham

Chang

Noh

et al. 2018

J. Geotech. Geoenviron. Eng.

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“…The extracellular glucosyltransferase enzyme catalyses transfer of D-glucopyranosyl residues from sucrose to dextran, resulting in the production of fructose as a by-product [ 32 , 43 ]. The glucosyltransferase enzyme production is mainly induced by the presence of sucrose in the media, instead of constitutive production (except for the Streptococcus species) [ 47 , 48 ]. The feedstock used for dextran production can include a wide array of sustainable elements, with some studies utilising sugarcane waste, raw sucrose, and sugarcane molasses to increase dextran production two-fold [ 49 ].…”

Section: The History Contemporary Status and Future Applicationsmentioning

confidence: 99%

Biomedical Applications of Bacteria-Derived Polymers

et al. 2021

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Plastics have found widespread use in the fields of cosmetic, engineering, and medical sciences due to their wide-ranging mechanical and physical properties, as well as suitability in biomedical applications. However, in the light of the environmental cost of further upscaling current methods of synthesizing many plastics, work has recently focused on the manufacture of these polymers using biological methods (often bacterial fermentation), which brings with them the advantages of both low temperature synthesis and a reduced reliance on potentially toxic and non-eco-friendly compounds. This can be seen as a boon in the biomaterials industry, where there is a need for highly bespoke, biocompatible, processable polymers with unique biological properties, for the regeneration and replacement of a large number of tissue types, following disease. However, barriers still remain to the mass-production of some of these polymers, necessitating new research. This review attempts a critical analysis of the contemporary literature concerning the use of a number of bacteria-derived polymers in the context of biomedical applications, including the biosynthetic pathways and organisms involved, as well as the challenges surrounding their mass production. This review will also consider the unique properties of these bacteria-derived polymers, contributing to bioactivity, including antibacterial properties, oxygen permittivity, and properties pertaining to cell adhesion, proliferation, and differentiation. Finally, the review will select notable examples in literature to indicate future directions, should the aforementioned barriers be addressed, as well as improvements to current bacterial fermentation methods that could help to address these barriers.

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“…(Notararigo et al, 2012). Sanyal et al, 1996;Ohshiro et al, 1996;Bower et al, 1996 Vitamin B9 _ B. subtilis and Ketogulonigenium vulgare Zhu et al, 2005;Cai et al, 2012 Vitamin B12 _ Pseudomonasand Propionibacterium Eggersdorfer et al, 1996 Vitamin C _ Chlorella pyrenoidosa Running et al, 1994 The most well-known bacterial polysaccharide, to be the first industrially produced is the dextran, used in many food ingredients as well as in pharmaceuticals as important substrates (Leathers, 2002).…”

Section: Polysaccharides and Derivativesmentioning

confidence: 99%

Microbial cell as bio-factory for bioactive compounds: review on microbial nutraceuticals

2019

Int. J. Biosci.

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Now a days it is a challenging and very serious issue to meet an adequate supply of quality food for growing population which is exploding at a geometric progression. Nutrient deficient diet is one of the major cause of constantly increasing health related problems. To resolve the health issues caused by malnourishments, nutraceutical like polysaccharides, multi-vitamins and enzymes have been produced from plants since many years. However, use of plant-derived nutraceuticals is limited due to low growth rate, seasonal variation, plant diseases or other environmental influences. Instead, microorganisms can be used for rapid, ecofriendly and economically nutraceuticals production in less space and generation time.Scientists are focusing on cultivation of useful microbial strains that have the potential to produce metabolites possessing pharmaceutical as well as nutrition value (nutraceuticals). This modern approach can compensate for food demand (quality diets) and disease curing. Various bacteria, fungi, algae and yeast have been cultivated for the production of the bioactive compounds. Such useful microbial extracted compounds are considered to be food graded healthy nutrition or nutraceuticals. This advance research can bring revolution in the field of medicine and nutrition.

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Dextran

Abstract: Introduction Historical Outline Chemical Structure Physiological Function Chemical Analyses Occurrence Biosynthesis Genetics and Molecular Biology Biodegradation Production Pr… Show more

Cited by 13 publications

References 140 publications

Improvement of Surface Erosion Resistance of Sand by Microbial Biopolymer Formation

Improvement of Surface Erosion Resistance of Sand by Microbial Biopolymer Formation

Biomedical Applications of Bacteria-Derived Polymers

Microbial cell as bio-factory for bioactive compounds: review on microbial nutraceuticals

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