Bioavailability of organic compounds solubilized in nonionic surfactant micelles

Wang, Zhilong

doi:10.1007/s00253-010-2938-z

Cited by 25 publications

(8 citation statements)

References 45 publications

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“…Moreover, several studies focused on evaluating the bioavailability of hydrocarbons in surfactant-supplemented samples suggest that compounds entrapped in micelles are not accessible for microorganisms. This fact was mainly proven for non-ionic surfactants (Dai et al 2010; Wang 2011), however recently similar results have been reported for rhamnolipids (Chrzanowski et al 2011; Zeng et al 2011). It is more plausible that the presence of biosurfactants may lead to flushing out potential carbon sources from the vicinity of the cells.…”

Section: Rhamnolipids In Bacterial Cell Motilitymentioning

confidence: 54%

Why do microorganisms produce rhamnolipids?

Chrzanowski

Ławniczak

Czaczyk

2011

World J Microbiol Biotechnol

172

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We review the environmental role of rhamnolipids in terms of microbial life and activity. A large number of previous research supports the idea that these glycolipids mediate the uptake of hydrophobic substrates by bacterial cells. This feature might be of highest priority for bioremediation of spilled hydrocarbons. However, current evidence confirms that rhamnolipids primarily play a role in surface-associated modes of bacterial motility and are involved in biofilm development. This might be an explanation why no direct pattern of hydrocarbon degradation was often observed after rhamnolipids supplementation. This review gives insight into the current state of knowledge on how rhamnolipids operate in the microbial world.

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Section: Rhamnolipids In Bacterial Cell Motilitymentioning

confidence: 54%

Why do microorganisms produce rhamnolipids?

Chrzanowski

Ławniczak

Czaczyk

2011

World J Microbiol Biotechnol

172

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“…1b, 2b2, c2). It has been reported that the nonionic surfactant has two polarities, hydrophilic and hydrophobic (Wang 2011), and that the intracellular hydrophobic pigment could be transported through the cell membrane to the extracellular nonionic surfactant micelles (Hu et al 2012a; Kang et al 2013a). There might be a relationship between pigment solubility in the nonionic surfactant micelles, such as with certain molecules of TX embedded in one pigment molecule.…”

Section: Discussionmentioning

confidence: 99%

Saturation effect and transmembrane conversion of Monascus pigment in nonionic surfactant aqueous solution

et al. 2017

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Extractive fermentation in a nonionic surfactant aqueous solution provides a promising and efficient method to produce Monascus pigments. The behaviour of pigment secretion during the extractive cultivation was investigated in the present work. The results revealed that the secretion of intracellular pigment was limited by its saturation concentration in the nonionic surfactant aqueous solution. The intracellular pigment was completely extracted to the outside of the cell at a low cell density and high concentration of Triton X-100 (TX) in fermentation broth; otherwise, a restriction for pigment extraction would occur. The decrement of the intracellular orange and yellow pigments was inconsistent with the increment of extracellular pigments with an increase in the TX concentration. It could be inferred that the intracellular orange pigment was converted to extracellular yellow pigment during the transmembrane secretion process, which might be attributed to the enzyme catalysis in the non-aqueous phase solution. This study helps explain the mechanism of variation of pigment characteristic and extraction capacity in extractive fermentation.

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“…The solubilization of these moderate polar pigments in nonionic surfactant micelles prevents them from direct contact with microbial cells. The indirect contact between microbial cells and the pigments solubilized in micelles decreases the rate of pigment degradation by the microbial cells (Dai et al ., ; Wang, ). It exhibited as the pigment degradation disappeared with the increase of nonionic surfactant concentration (Fig.…”

Section: Discussionmentioning

confidence: 99%

Solubilization capacity of nonionic surfactant micelles exhibiting strong influence on export of intracellular pigments in Monascus fermentation

Kang¹,

Zhang

et al. 2013

Microbial Biotechnology

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SummaryIn this study, perstractive fermentation of intracellular Monascus pigments in nonionic surfactant micelle aqueous solution had been studied. The permeability of cell membrane modified by nonionic surfactant might have influence on the rate of export of intracellular pigments into its extracellular broth while nearly no effect on the final extracellular pigment concentration. However, the solubilization of pigments in nonionic surfactant micelles strongly affected the final extracellular pigment concentration. The solubilization capacity of micelles depended on the kind of nonionic surfactant, the super-molecule assembly structure of nonionic surfactant in an aqueous solution, and the nonionic surfactant concentration. Elimination of pigment degradation by export of intracellular Monascus pigments and solubilizing them into nonionic surfactant micelles was also confirmed experimentally. Thus, nonionic surfactant micelle aqueous solution is potential for replacement of organic solvent for perstractive fermentation of intracellular product.

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Bioavailability of organic compounds solubilized in nonionic surfactant micelles

Cited by 25 publications

References 45 publications

Why do microorganisms produce rhamnolipids?

Why do microorganisms produce rhamnolipids?

Saturation effect and transmembrane conversion of Monascus pigment in nonionic surfactant aqueous solution

Solubilization capacity of nonionic surfactant micelles exhibiting strong influence on export of intracellular pigments in Monascus fermentation

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