Investigation on the locus of solubilization of polycyclic aromatic hydrocarbons in non-ionic surfactant micelles with 1H NMR spectroscopy

Bernardez, L. A.

doi:10.1016/j.colsurfa.2008.03.027

Cited by 57 publications

(37 citation statements)

References 16 publications

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“…A detailed description of the experimental apparatus, materials and measuring techniques for the dissolution experiments is given elsewhere [17,18,20,21]. Here we will present a brief summary of the experimental aspects of the work.…”

Section: Methodsmentioning

confidence: 99%

“…In this equation, C T,eq i is the equilibrium concentration of solute i in the bulk solution, C T i is the contaminant concentration in the bulk solution. The total equilibrium saturation concentration of solute is a function of its equilibrium concentration in the aqueous phase alone, C a,eq i and surfactant concentration, C surf depends on both the CMC and SC, the solubilization capacity [18,21]. Note that the input values for the above equation of equilibrium concentration for naphthalene and phenanthrene in Brij 35 solutions obtained from the partitioning experiments [17,18].…”

Section: Dissolution Experimentsmentioning

confidence: 98%

“…Brij 35 is useful for the solubilization of membrane proteins and can also entrap hydrophobic reactants in liquid-phase enzyme reactions. Surfactant Brij 35 is one of the most commonly used non-ionic surfactant employed in many experimental studies on solubilization and biodegradation of hydrophobic organic compounds [9,17,18,20,21].…”

Section: Napl and Surfactant Solution Preparationmentioning

confidence: 99%

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A rotating disk apparatus for assessing the biodegradation of polycyclic aromatic hydrocarbons transferring from a non-aqueous phase liquid to solutions of surfactant Brij 35

Bernardez

2008

Bioprocess Biosyst Eng

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A rotating disk apparatus was used to investigate the biodegradation of PAHs from non-aqueous phase liquids to solutions of Brij 35. The mass transfer of PAHs in absence of surfactant solution was not large enough to replenish the degraded PAHs. The addition of surfactant resulted in an overall enhancement of biodegradation rates compared to that observed in pure aqueous solution. This is because surfactant partition significant amount of PAHs into the bulk phase, where uptake occurs but the supply of PAHs to the aqueous phase through micellar solubilization at latter period limited biodegradation rates. It was demonstrated the relationship between biodegradation rate and surfactant dose and the mechanisms controlling the mass transfer of PAH from NAPLs. The satisfactory comparison of the experimental data with the predictions of a model, which parameters were determined from independent solubilization and dissolution experiments and based on the main assumption that the solutes must be present in the true aqueous phase to be degraded, allows us to conclude the absence of direct uptake of PAHs by bacteria.

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Section: Methodsmentioning

confidence: 99%

Section: Dissolution Experimentsmentioning

confidence: 98%

Section: Napl and Surfactant Solution Preparationmentioning

confidence: 99%

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A rotating disk apparatus for assessing the biodegradation of polycyclic aromatic hydrocarbons transferring from a non-aqueous phase liquid to solutions of surfactant Brij 35

Bernardez

2008

Bioprocess Biosyst Eng

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“…In addition, we investigated the influences of the concentration and molecular weight (number of added moles) of the 2 surfactants as well as the cause of latanoprost degradation observed when the additives were added at a high concentration in the previous report (Ochiai et al, 2010). Furthermore, the latanoprost stabilization mechanism was elucidated by analyzing the micelle structure and state of interaction between the micelles and the latanoprost employing the fluorescent probe method (Ueno et al, 1988;Wolszczak and Miller, 2002) and nuclear magnetic resonance (NMR) spectroscopy (Ueno et al, 1992;Bernardez, 2008).…”

Section: Introductionmentioning

confidence: 99%

The stabilization mechanism of latanoprost

Ochiai¹,

Danjo²

2011

International Journal of Pharmaceutics

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“…The results from these studies were not as conclusive as those previously mentioned, and the solubilization behavior was found to be linear for certain combinations of PAHs, and not for others. More recent studies using 1 H nuclear magnetic resonance (NMR) spectroscopy suggest that the locus of solubilization is not restricted to the core of the micelle alone (Bernardez 2008). To investigate the solubility enhancement from mixtures of aromatic compounds, McCray et al (2001) measured the micellar solubilization of toluene, ethylbenzene and butylbenzene in a biosurfactant (dirhamnolipid).…”

Section: Ii121 Introduction To Dissolution and Micellar Solubilizmentioning

confidence: 99%

Metric Identification and Protocol Development for Characterizing DNAPL Source Zone Architecture and Associated Plume Response

Abriola¹,

Miller²,

Pennell³

et al. 2013

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)2. REPORT TYPE SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION / AVAILABILITY STATEMENT SUPPLEMENTARY NOTES ABSTRACTThe overarching goal of this research is to develop and demonstrate a comprehensive approach for field characterization of DNAPL source zones which quantifies the key features that control plume response. Here the intent is to integrate targeted (local-scale) in situ tests with transect-based observations of downstream contaminant flux or concentration and information on subsurface geologic variability. To address its primary goal, the research encompasses the following specific objectives: (1) identification of the most information rich metrics for linking NAPL architecture to plume response; (2) development and refinement of in situ test methods and modeling tools that can be used to quantify identified metrics in targeted regions of the source zone; (3) integration of these metrics and tools with current machine learning characterization methods for an overall source zone assessment protocol; and (4) development of simplified models for prediction of plume response. The research approach integrates batch, column and aquifer cell experiments with mathematical modeling and data processing tools to identify and quantify features of the DNAPL architecture controlling down gradient plume response. SUBJECT TERMSField characterization; Metric identification; DNAPL; SECURITY CLASSIFICATION OF:No classified information

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Investigation on the locus of solubilization of polycyclic aromatic hydrocarbons in non-ionic surfactant micelles with 1H NMR spectroscopy

Cited by 57 publications

References 16 publications

A rotating disk apparatus for assessing the biodegradation of polycyclic aromatic hydrocarbons transferring from a non-aqueous phase liquid to solutions of surfactant Brij 35

A rotating disk apparatus for assessing the biodegradation of polycyclic aromatic hydrocarbons transferring from a non-aqueous phase liquid to solutions of surfactant Brij 35

The stabilization mechanism of latanoprost

Metric Identification and Protocol Development for Characterizing DNAPL Source Zone Architecture and Associated Plume Response

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