Hydrocarbon degradation by a soil microbial population with β-cyclodextrin as surfactant to enhance bioavailability

Bardi, Laura; Mattei, Alessandra; Steffan, Silvia; Marzoná, M.

doi:10.1016/s0141-0229(00)00275-1

Cited by 133 publications

(62 citation statements)

References 16 publications

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“…Bioremediation technologies have been developed for soils and coastal areas using the addition of nutrients and microbes [10][11][12][13]. However, it is known that biodegradation efficiencies of petroleum hydrocarbons in soil can be limited by physicochemical as well as biological factors, such as nutrients, pH, temperature, moisture, oxygen, soil properties, and contaminant concentration, number and type or species of microorganisms [14][15][16][17][18][19][20][21]. Also, oil spills result in an imbalance in the carbon-nitrogen ratio at the spill site, because crude-oil is essentially a mixture of carbon and hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Factorial Designs Application to Study Enhanced Bioremediation of Soil Artificially Contaminated with Weathered Bonny Light Crude Oil through Biostimulation and Bioaugmentation Strategy

Agarry¹,

Ogunleye²

2012

JEP

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The objective of this study was designed to evaluate the effects of biostimulation and bioaugmentation amendment agents (NPK fertilizer, Tween 80 and mixed culture) on the bioremediation of tropical soil samples artificially contaminated with Weathered Bonny Light Crude Oil (WBLCO). Response Surface Methodology (RSM) with Box Behnken Design (BBD) was used with three levels and three factors of NPK fertilizer (2 -6 g), Tween 80 (5 -15 mg/l) and mixed culture (0.5 -1.5 g/l) as independent variables and WBLCO removal as dependent variable (response) in a six weeks remediation period. The results showed that the rate of WBLCO removal generally increased with increase in the amount of NPK fertilizer, Tween 80 and mixed culture (biomass), respectively. A statistically significant (P < 0.0001) second-order quadratic regression model for WBLCO removal (using design-expert statistical program (v. 6.0.8)) with a coefficient of determination, R (=0.9996) was obtained. Numerical optimization technique based on desirability function was carried out to optimize the bioremediation process. The optimum values for biostimulation and bioaugmentation amendment agents to achieve a predicted maximum WBLCO removal of 84.88 percent were found to be: NPK fertilizer, 4.25 g; Tween 80, 10.22 mg/l and mixed culture, 0.46 g/l. At this optimum point, the observed WBLCO removal was found to be 83.79 percent. The statistical analyses and the closeness of the experimental results and model predictions show the reliability of the regression model and thus, biostimulation and bioaugmentation of indigenous microbial density and activity can reduce remediation period of petroleum hydrocarbon contaminated environment and subsequently the cost of remediation.

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Section: Introductionmentioning

confidence: 99%

Factorial Designs Application to Study Enhanced Bioremediation of Soil Artificially Contaminated with Weathered Bonny Light Crude Oil through Biostimulation and Bioaugmentation Strategy

Agarry¹,

Ogunleye²

2012

JEP

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“…7 Cyclodextrins are used as surfactants and size controllers of different kind of materials. 6 In the present work, we describe the preparation and characterization of a ferrofluid using β-cyclodextrin to stabilize magnetite nanoparticles in colloidal suspension. In this system, β-cyclodextrin may also act as a size selector.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a ferrofluid using cyclodextrin and magnetite

Bocanegra-Diaz¹,

Mohallem²,

Sinisterra³

2003

J. Braz. Chem. Soc.

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Um ferrofluido foi obtido a partir da magnetita e da β-ciclodextrina, com a formação de um complexo de inclusão. A caracterização físico-química do complexo magnétita: β-ciclodextrina foi realizada através de espectroscopia de absorção na região do infravermelho com transformada de Fourier, difração de raios X, análise térmica (TG/DTA), microscopia eletrônica de transmissão (TEM) e espectroscopia de absorção atômica. É a primeira vez que se relata na literatura a formação de um complexo de inclusão de um óxido metálico em ciclodextrinas A ferrofluid has been obtained from magnetite and β-cyclodextrin, with the formation of an inclusion complex. The magnetite and β-cyclodextrin complex was characterized by FTIR spectroscopy, X-ray diffraction, thermal analysis (TG/DTA), transmission electron microscopy (TEM) and atomic absorption spectroscopy. As far as we know, this is the first report on an inclusion compound between a metal oxide and cyclodextrins. Keywords: ferrofluid, cyclodextrin, magnetite, magnetic materials, inclusion complex IntroductionFerrofluids are colloidal suspensions composed of single-domain magnetic nanoparticles dispersed in appropriate solvents (polar or non polar).1 Since their discovery in 1965 by Papell, 2 ferrofluids have raised a growing interest in the scientific and industrial communities due to their physical properties and applications. Ferrofluids can be applied to immunoassay, cell separation, contrast agents for ultrasound and magnetic resonance imaging (MRI), magnetic inks, biosensors, magnetic microactuactors, seals, bearing dampers and lubricants, etc. 3These specialized applications of ferrofluids impose strict requirements on their characteristics, such as chemical composition, size distribution uniformity, crystal structure, stability of magnetic properties, surface structure, adsorption properties, solubility and low toxicity. Many of these properties depend decisively on particle size, shape, composition and structure, and therefore rigorous control of the synthesis of ferrofluids is necessary. 5Cyclodextrins are water-soluble oligosaccharides composed of at least six (1-4) linked α-D-glucosyl residues which have the shape of a hollow, truncated cone, capable of forming inclusion complexes with a variety of guest molecules in the solid state, as well as in solution, with sizes compatible with the dimensions of the cavity. 7Cyclodextrins are used as surfactants and size controllers of different kind of materials. 6In the present work, we describe the preparation and characterization of a ferrofluid using β-cyclodextrin to stabilize magnetite nanoparticles in colloidal suspension. In this system, β-cyclodextrin may also act as a size selector. ExperimentalAnalytical grade chemicals and deionized water were used throughout. Synthesis of magnetite Preparation of the magnetic fluidThe preparation of the magnetic fluid was carried out by mixing 2.8 mg of β-cyclodextrin and 8.0 mL of NH 4 OH (8.5 mol L -1 ) dissolved in 15.0 mL of deionized water under continuous and vigorous st...

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“…En el caso de la tensión superficial (tensión presente entre la interface liquido-aire), los surfactantes la disminuyen debido a que interfieren en la formación de puentes de hidrogeno y otras fuerzas relacionadas en la adhesión con otras moléculas (Ayirala y Rao 2006). Los BS actúan mejorando e incrementando la transferencia de masa de compuestos hidrofóbicos desde la fase solida o liquida no acuosa hacia la fase acuosa reduciendo la tensión interfacial y por consiguiente acumulando compuestos hidrofóbicos dentro de las micelas (Li et al 2002, Bardi 2000. El efecto más importante del BS entre el suelo y el contaminante es la estimulación del transporte de masa del contaminante desde el suelo hasta la fase acuosa, donde se puede dar la biodisponibilidad, la cual está influenciada por las interacciones de surfactante-células, interacciones célula-contaminante e interacciones de superficie de contaminantes, esto va relacionado con tres mecanismos: la emulsión de contaminantes, la solubilización micelar y la facilidad de transporte.…”

Section: Mecanismo De Acción De Los Biosurfactantesunclassified

Biosurfactantes y su papel en la biorremediación de suelos contaminados con plaguicidas

Cruz¹,

Sánchez-Salinas²,

Ortiz-Hernández³

2013

Rev Latinoam Biotecnol Ambient Algal

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ResumenLos biosurfactantes (BS) son un grupo de moléculas de origen microbiano que se caracterizan por ser anfipáticas, es decir que sus moléculas presentan dos partes diferentes, una hidrofóbica y otra hidrofílica. Son un grupo estructuralmente diverso de moléculas tensoactivas, que presentan en general menor toxicidad y mayor biodegradabilidad que los surfactantes sintéticos. Entre las aplicaciones más estudiadas de los BS están aquellas relacionadas con la industria del petróleo y la bioremediación de sitios o residuos contaminados con hidrocarburos. No obstante, los biosurfactantes pueden ser utilizados para otro tipo de compuestos xenobióticos, como es el caso de los plaguicidas. Estos compuestos permiten controlar la proliferación de plagas y enfermedades de los cultivos y del ganado, así como reducir o evitar las pérdidas en la producción de alimentos y contribuir al control de los vectores de diversas enfermedades. No obstante la importancia económica de los plaguicidas, es necesario destacar que su aplicación indiscriminada y sin control ha generado diversos problemas como intoxicación a seres humanos, efectos carcinogénicos, teratogénicos y mutagénicos, además de numerosos problemas ambientales como contaminación de mantos freáticos, aguas continentales y costeras; contaminación del suelo y bioacumulación en las cadenas alimentarias. Generalmente los plaguicidas son de naturaleza hidrofóbica, por lo que el uso de los BS puede ser prometedor en la remediación de sitios contaminados o en el tratamiento biotecnológico de residuos de plaguicidas. Palabras clave: biosurfactante, plaguicida, biorremediación, solubilidad AbstractBiosurfactants (BS) are a group of microbial molecules that are characterized as amphipathic, meaning that have two distinct parts, one hydrophobic and the other hydrophilic. These compounds are a group structurally diverse which generally have lower toxicity and higher biodegradability than synthetic surfactants. Typical applications of BS studied are those related to oil and bioremediation of sites contaminated with hydrocarbons or residues. However, BS can be used for other types of xenobiotics, such as pesticides. These compounds can control the spread of pests and diseases of crops and livestock, as well as reduce or prevent losses in food production and contribute to the control of vectors of various diseases. Despite the economic importance of pesticides, it should be noted that the indiscriminate and uncontrolled application has generated various problems like toxicity to humans, carcinogenic, teratogenic and mutagenic

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Hydrocarbon degradation by a soil microbial population with β-cyclodextrin as surfactant to enhance bioavailability

Cited by 133 publications

References 16 publications

Factorial Designs Application to Study Enhanced Bioremediation of Soil Artificially Contaminated with Weathered Bonny Light Crude Oil through Biostimulation and Bioaugmentation Strategy

Factorial Designs Application to Study Enhanced Bioremediation of Soil Artificially Contaminated with Weathered Bonny Light Crude Oil through Biostimulation and Bioaugmentation Strategy

Preparation of a ferrofluid using cyclodextrin and magnetite

Biosurfactantes y su papel en la biorremediación de suelos contaminados con plaguicidas

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