Transport of gellan gum microbeads through sand: an experimental evaluation for encapsulated cell bioaugmentation

Moslemy, Peyman; Neufeld, Ronald J.; Millette, D.; Guiot, Serge R.

doi:10.1016/j.jenvman.2003.09.003

Cited by 28 publications

(16 citation statements)

References 27 publications

(21 reference statements)

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“…Cell immobilization in gellan gum was carried out essentially following the method described by Moslemy et al (2003). Gellan gum (0.75%; w/v) was initially added to 100 ml deionized water and heated to 75°C to completely dissolve the gum.…”

Section: Optimization Of Cell Immobilization Protocolmentioning

confidence: 99%

“…However, the material is susceptible to degradation and has relatively low mechanical stability (Ha et al 2009). Gellan gum is another commonly used matrix as the gel is stable over a wide pH range of 2-10, non-toxic and recommended in fermentation technology due to its mechanical and thermal stability (Norton and Lacroix 1990;Camelin et al 1993;Ashtaputre and Shah 1995;Moslemy et al 2002Moslemy et al , 2003.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced phenol degradation by immobilized Acinetobacter sp. strain AQ5NOL 1

Ahmad

Shamaan

Arif

et al. 2011

World J Microbiol Biotechnol

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A locally isolated Acinetobacter sp. Strain AQ5NOL 1 was encapsulated in gellan gum and its ability to degrade phenol was compared with the free cells. Optimal phenol degradation was achieved at gellan gum concentration of 0.75% (w/v), bead size of 3 mm diameter (estimated surface area of 28.26 mm(2)) and bead number of 300 per 100 ml medium. At phenol concentration of 100 mg l(-1), both free and immobilized bacteria exhibited similar rates of phenol degradation but at higher phenol concentrations, the immobilized bacteria exhibited a higher rate of degradation of phenol. The immobilized cells completely degrade phenol within 108, 216 and 240 h at 1,100, 1,500 and 1,900 mg l(-1) phenol, respectively, whereas free cells took 240 h to completely degrade phenol at 1,100 mg l(-1). However, the free cells were unable to completely degrade phenol at higher concentrations. Overall, the rates of phenol degradation by both immobilized and free bacteria decreased gradually as the phenol concentration was increased. The immobilized cells showed no loss in phenol degrading activity after being used repeatedly for 45 cycles of 18 h cycle. However, phenol degrading activity of the immobilized bacteria experienced 10 and 38% losses after the 46 and 47th cycles, respectively. The study has shown an increased efficiency of phenol degradation when the cells are encapsulated in gellan gum.

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Section: Optimization Of Cell Immobilization Protocolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced phenol degradation by immobilized Acinetobacter sp. strain AQ5NOL 1

Ahmad

Shamaan

Arif

et al. 2011

World J Microbiol Biotechnol

View full text Add to dashboard Cite

show abstract

“…These technologies are more suited to surface applications due to the probability that microbial encapsulation in, or attachment to, larger particles may further impede their movement through soil or sediment. 150 Depending on the environmental conditions, microorganisms, and encapsulating material used, adverse conditions may develop within the capsule, such as the accumulation of toxic compounds or anoxic conditions, which may inhibit or kill the inoculant. 149,251 It is therefore critical to match the appropriate carrier technology with the specific conditions of the contaminated site.…”

Section: Activated Soil Bioaugmentationmentioning

confidence: 99%

New Approaches for Bioaugmentation as a Remediation Technology

Gentry

Rensing

Pepper

2004

Critical Reviews in Environmental Science and Technology

285

124

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“…Due to its good rheological characteristics, gellan gum is a bacterial polysaccharide with great commercial potential for food, pharmaceuticals, and particularly environmental bioremediation. There are reports that gellan gum can be used in the bioremediation of contaminated soils and aquifers (13,23,24,25).…”

mentioning

confidence: 99%

Modeling for Gellan Gum Production by Sphingomonas paucimobilis ATCC 31461 in a Simplified Medium

Wang

Yuan

et al. 2006

Appl Environ Microbiol

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Gellan gum production was carried out by Sphingomonas paucimobilis ATCC 31461 in a simplified medium with a short incubation time, and a kinetic model for understanding, controlling, and optimizing the fermentation process was proposed. The results revealed that glucose was the best carbon source and that the optimal concentration was 30 g liter ؊1 . As for the fermenting parameters, considerably large amounts of gellan gum were yielded by an 8-h-old culture and a 4% inoculum at 200 rpm on a rotary shaker. Under the optimized conditions, the maximum level of gellan gum (14.75 g liter ؊1 ) and the highest conversion efficiency (49.17%) were obtained in a 30-liter fermentor in batch fermentation. Logistic and Luedeking-Piret models were confirmed to provide a good description of gellan gum fermentation, which gave some support for the study of gellan gum fermentation kinetics. Additionally, this study is the first demonstration that gellan gum production is largely growth associated by analysis of kinetics in its batch fermentation process. Based on model prediction, higher gellan gum production (17.71 g liter ؊1 ) and higher conversion efficiency (57.12%) were obtained in fed-batch fermentation at the same total glucose concentration (30 g liter ؊1 ).

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Transport of gellan gum microbeads through sand: an experimental evaluation for encapsulated cell bioaugmentation

Cited by 28 publications

References 27 publications

Enhanced phenol degradation by immobilized Acinetobacter sp. strain AQ5NOL 1

Enhanced phenol degradation by immobilized Acinetobacter sp. strain AQ5NOL 1

New Approaches for Bioaugmentation as a Remediation Technology

Modeling for Gellan Gum Production by Sphingomonas paucimobilis ATCC 31461 in a Simplified Medium

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