Ramping of pH Across the Water-Pool of a Reverse Micelle

Mukherjee, Puspal; Gupta, S.P.; Rafiq, Shahnawaz; Yadav, Rajeev; Jain, Vipin; Raval, Jayraj; Sen, Pratik

doi:10.1021/acs.langmuir.5b04429

Cited by 22 publications

(16 citation statements)

References 48 publications

(65 reference statements)

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“…A concept proposed by some researchers [96], but not generally accepted [97], is the buffer-like action of water from RM due to the effect of titratable head groups of surfactant, the component with the higher concentration in the RM aggregates. This behavior it was reported especially for AOT surfactant which maintains the inside pH values to 5.0-5.5 for any value of the bulk buffer used, while the surfactant mixture CTAB/hexanol has a very low buffering capacity in the experimental range of pH from 4 to 10 [94].…”

Section: Ph Across the Water-poolsupporting

confidence: 70%

“…Besides the methods using optical pH sensor or molecular probe, Mukherjee &coworkers [94] proposed the acid-catalyzed hydrolysis of sucrose [95], respectively the inversion of sucrose, reaction monitorized by the rotation of polarized light. Their study was based on two working hypothesis: (i) the neutral molecule of sucrose will be located inside the water pool; (ii) the availability of protons inside the water-pool will affect the rate of sucrose hydrolysis in micellar medium compared with the reaction rate in bulk-water.…”

Section: Ph Across the Water-poolmentioning

confidence: 99%

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Versatility of Reverse Micelles: From Biomimetic Model to Nano(Bio)Sensors Design

Arsene¹,

Gurban²,

Jecu³

et al. 2018

Preprint

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This paper presents an overview of the principal structural and dynamics characteristics of reverse micelles (RMs) in order to highlight their structural flexibility and versatility, along with the possibility to modulate their parameters in a controlled-manner. The multifunctionality in a large range of different scientific fields is exemplified in two distinct directions: a theoretical model for mimicry of biological microenvironment and practical application in the field of nanotechnology and nano-based sensors. RMs represents a convenient experimental approach that limits the drawbacks of the conventionally biological studies in vitro, while the particular structure confers them the status of simplified mimics of cells by reproducing a complex supramolecular organization in an artificial system. The biological relevance of RMs is discussed in some particular cases referring to the confinement and crowding environment, molecular dynamics of water and cell membrane structure. The use of RMs in different range of applications seems to be more promising due to their structural and compositional flexibility, a high efficiency and selectivity being achieved. The advance in nanotechnology is based on developing new methods of nanomaterials synthesis and deposition. This review highlighting the advantages of using RMs in synthesis of nanoparticles with specific properties and in nano (bio)sensors design.

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Section: Ph Across the Water-poolsupporting

confidence: 70%

Section: Ph Across the Water-poolmentioning

confidence: 99%

Versatility of Reverse Micelles: From Biomimetic Model to Nano(Bio)Sensors Design

Arsene¹,

Gurban²,

Jecu³

et al. 2018

Preprint

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“…The pKa values for (protonated) o ‐, m ‐ and p ‐fluoroaniline isomers are, 3.20, 3.59 and 4.65, respectively , suggesting that protonation might be to blame; addition of a small amount of triethylamine (Fig. b) gave sharp signals for all three isomers, confirming that the acidity of the water pool in the AOT solution was causing transient protonation of the most basic of the three isomers ( p ‐fluoroaniline).…”

Section: Resultsmentioning

confidence: 89%

¹⁹F NMR matrix‐assisted DOSY: a versatile tool for differentiating fluorinated species in mixtures

Poggetto

Antunes

Nilsson

et al. 2016

Magnetic Reson in Chemistry

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NMR is the most versatile tool for the analysis of organic compounds and, in combination with Diffusion-Ordered Spectroscopy ('DOSY'), can give information on compounds in complex mixtures without the need for physical separation. In mixtures where the components' diffusion coefficients are nearly identical, for example because of similar sizes, Matrix-Assisted DOSY ('MAD') can help separate the signals of different constituents, resolving their spectra. Unfortunately, DOSY (including MAD) typically fails where signals overlap, as is common in H NMR. Using F NMR avoids such problems, because the great sensitivity of the F chemical shift to local environment leads to very well-dispersed spectra. Another advantage is the absence of any F background signals from the matrices typically used, avoiding interference with the analyte signals. In this study, differentiation among fluorophenol and fluoroaniline isomers was evaluated using normal and reverse micelles-of sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB) and dioctyl sodium sulfosuccinate (AOT)-as matrices. These surfactants provide useful diffusion separation in these difficult mixtures, with all the solutes interacting with the matrices to different extents, in some cases leading to differences in diffusion coefficient of more than 30%. The best matrices for separating the signals of both acid and basic species were shown to be AOT and CTAB, which are useful over a wide range of surfactant concentration. Copyright © 2016 John Wiley & Sons, Ltd.

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“…At present, it is not possible to explain this effect. Mukherjee et al [46] had reported that a proton gradient exists inside the water-pool of charged reverse micelles. Possibly, in our case the reverse micelle is non-ionic in nature with nonpolarizable groups, thus no proton gradient is present which may affect the enzyme activity.…”

Section: Encapsulation Of Go X In Microemulsionmentioning

confidence: 99%

Entrapment of Glucose Oxidase in Reverse Micelle Microemulsion Systems for Glucose Detection in Lipid Based Food Products

et al. 2019

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Entrapment of glucose oxidase (GOx) enzyme in a new reverse micelle emulsion system was studied. The microemulsion consists of aqueous phase (buffered enzyme)/SPAN 85/n-decane. Critical micelle concentration (CMC) of surfactant-SPAN 85 in n-decane was determined using dynamic light scattering study and it was used to develop microemulsion system. Most stable and optically transparent microemulsion with entrapped glucose oxidase showed higher values of specific enzyme activity, maximum reaction rate (Vmax) and turn over number and low value of Michaelis-constant (Km) in comparison to homogeneous GOx (enzyme-glucose oxidase) system. The microemulsion system was successfully used to quantify D-glucose in lipid based food products without any sample preparation. Comparison of these results with chemical method (phenol-sulfuric acid method) and commercial kit method used in food industry validate the efficiency of the new proposed system. The study provides new information about the glucose content of some commonly consumed milk based products where nutritional labels do not accurately show true glucose content. These findings provide support for comprehensive glucose labeling to food products commonly used by the children.

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Ramping of pH Across the Water-Pool of a Reverse Micelle

Cited by 22 publications

References 48 publications

Versatility of Reverse Micelles: From Biomimetic Model to Nano(Bio)Sensors Design

Versatility of Reverse Micelles: From Biomimetic Model to Nano(Bio)Sensors Design

¹⁹F NMR matrix‐assisted DOSY: a versatile tool for differentiating fluorinated species in mixtures

Entrapment of Glucose Oxidase in Reverse Micelle Microemulsion Systems for Glucose Detection in Lipid Based Food Products

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Ramping of pH Across the Water-Pool of a Reverse Micelle

Cited by 22 publications

References 48 publications

Versatility of Reverse Micelles: From Biomimetic Model to Nano(Bio)Sensors Design

Versatility of Reverse Micelles: From Biomimetic Model to Nano(Bio)Sensors Design

19F NMR matrix‐assisted DOSY: a versatile tool for differentiating fluorinated species in mixtures

Entrapment of Glucose Oxidase in Reverse Micelle Microemulsion Systems for Glucose Detection in Lipid Based Food Products

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¹⁹F NMR matrix‐assisted DOSY: a versatile tool for differentiating fluorinated species in mixtures