Continuous-flow microfluidic method for octanol-water partition coefficient measurement

Stephan, Khaled; Saab, Joseph; Mokbel, Ilham; Goutaudier, C.; Ferrigno, Rosaria

doi:10.1016/j.fluid.2014.07.033

Cited by 6 publications

(7 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a consequence, the phase separation at the end of the microchannel can be avoided. The feasibility of in situ measurements of partition coefficients has been shown for parallel laminar flows, , slug flows, − and other microvolume extraction systems. − In microfluidics, concentrations are mostly determined in situ by thermal-lens microscopy or fluorescence . These measurement techniques do not allow for complete LLE measurements in ternary mixtures, because they only quantify one component in both phases and therefore measure only the partition coefficient of this component.…”

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficient Determination of Liquid–Liquid Equilibria Using Microfluidics and Raman Microspectroscopy

Thien

Peters

Brands

et al. 2017

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Experimental liquid–liquid equilibrium (LLE) data are indispensable for many applications ranging from extraction column design to water partitioning of organics in the environment. However, conventional LLE experiments are time-consuming and need large sample volumes. Therefore, a measurement setup is presented for the time and material efficient determination of LLE data. The measurement setup combines the advantages of microfluidics and Raman microspectroscopy: The small dimensions of the used H-cell microchannel lead to rapid equilibration and small sample consumption; Raman microspectroscopy allows for rapid in situ quantification of all components. The measurement setup has successfully been validated by measuring the LLE of the ternary system cyclohexane–methanol–toluene. Excellent agreement with the literature data has been achieved. Thus, the developed setup allows for the efficient determination of liquid–liquid equilibria in multicomponent mixtures.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Efficient Determination of Liquid–Liquid Equilibria Using Microfluidics and Raman Microspectroscopy

Thien

Peters

Brands

et al. 2017

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Experiments are generally of two types, slug flow 7−9 or side-by-side flow. 10 In slug flow, droplets of octanol and aqueous solution are transported in contact with one another through a microfluidic channel. Equilibration between aqueous and octanol phases occurs quickly due to a high surface-area-to-volume ratio and constant mixing of the interface as the droplets flow through the channel.…”

mentioning

confidence: 99%

“…The analyte concentrations in each of the phases as well as the distance to reach equilibrium have been determined using fluorescence measurements. 10 To expand the scope of measurements beyond fluorescent compounds, slug-flow studies have been carried out with UV−vis absorption detection. 7,9 UV−vis monitoring limits further miniaturization, however, due to the path length requirements for sensitive detection, necessitating sample volumes of hundreds of nanoliters or more.…”

mentioning

confidence: 99%

“…To address the need for a rapid, small volume method of determining octanol–water partition coefficients, recent research has adapted microfluidic sample handling to the measurement of K ow . Experiments are generally of two types, slug flow − or side-by-side flow . In slug flow, droplets of octanol and aqueous solution are transported in contact with one another through a microfluidic channel.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Confocal Raman Microscopy for in Situ Measurement of Octanol–Water Partitioning within the Pores of Individual C₁₈-Functionalized Chromatographic Particles

Kitt

Harris

2015

Anal. Chem.

View full text Add to dashboard Cite

Octanol-water partitioning is one of the most widely used predictors of hydrophobicity and lipophilicity. Traditional methods for measuring octanol-water partition coefficients (K(ow)), including shake-flasks and generator columns, require hours for equilibration and milliliter quantities of sample solution. These challenges have led to development of smaller-scale methods for measuring K(ow). Recent advances in microfluidics have produced faster and smaller-volume approaches to measuring K(ow). As flowing volumes are reduced, however, separation of water and octanol prior to measurement and detection in small volumes of octanol phase are especially challenging. In this work, we reduce the receiver volume of octanol-water partitioning measurements from current practice by six-orders-of-magnitude, to the femtoliter scale, by using a single octanol-filled reversed-phase, octadecylsilane-modified (C18-silica) chromatographic particle as a collector. The fluid-handling challenges of working in such small volumes are circumvented by eliminating postequilibration phase separation. Partitioning is measured in situ within the pore-confined octanol phase using confocal Raman microscopy, which is capable of detecting and quantifying a wide variety of molecular structures. Equilibration times are fast (less than a minute) because molecular diffusion is efficient over distance scales of micrometers. The demonstrated amount of analyte needed to carry out a measurement is very small, less than 50 fmol, which would be a useful attribute for drug screening applications or testing of small quantities of environmentally sensitive compounds. The method is tested for measurements of pH-dependent octanol-water partitioning of naphthoic acid, and the results are compared to both traditional shake-flask measurements and sorption onto C18-modified silica without octanol present within the pores.

show abstract

Aqueous solubility, vapor pressure and octanol-water partition coefficient of two phthalate isomers dibutyl phthalate and di-isobutyl phthalate contaminants of recycled food packages

Ishak¹,

Stephan²,

Karam³

et al. 2016

Fluid Phase Equilibria

View full text Add to dashboard Cite

Continuous-flow microfluidic method for octanol-water partition coefficient measurement

Cited by 6 publications

References 27 publications

Efficient Determination of Liquid–Liquid Equilibria Using Microfluidics and Raman Microspectroscopy

Efficient Determination of Liquid–Liquid Equilibria Using Microfluidics and Raman Microspectroscopy

Confocal Raman Microscopy for in Situ Measurement of Octanol–Water Partitioning within the Pores of Individual C₁₈-Functionalized Chromatographic Particles

Aqueous solubility, vapor pressure and octanol-water partition coefficient of two phthalate isomers dibutyl phthalate and di-isobutyl phthalate contaminants of recycled food packages

Contact Info

Product

Resources

About

Continuous-flow microfluidic method for octanol-water partition coefficient measurement

Cited by 6 publications

References 27 publications

Efficient Determination of Liquid–Liquid Equilibria Using Microfluidics and Raman Microspectroscopy

Efficient Determination of Liquid–Liquid Equilibria Using Microfluidics and Raman Microspectroscopy

Confocal Raman Microscopy for in Situ Measurement of Octanol–Water Partitioning within the Pores of Individual C18-Functionalized Chromatographic Particles

Aqueous solubility, vapor pressure and octanol-water partition coefficient of two phthalate isomers dibutyl phthalate and di-isobutyl phthalate contaminants of recycled food packages

Contact Info

Product

Resources

About

Confocal Raman Microscopy for in Situ Measurement of Octanol–Water Partitioning within the Pores of Individual C₁₈-Functionalized Chromatographic Particles