Linear solvation energy relationships of anionic dimeric surfactants in micellar electrokinetic chromatography

Biesen, Geert Van; Bottaro, Christina S.

doi:10.1016/j.chroma.2007.04.026

Cited by 18 publications

(12 citation statements)

References 35 publications

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“…We contacted the authors and they provided us with the corrected numerical values for k CTAB and k SDS . We updated our existing micellar SDS correlation to include the corrected MEKC log k SDS data from the Fuguet et al [7], and the published MEKC retention factor data reported by van Biesen and Bottaro [27], Foley et al [28], Vitha and Carr [29], and Bailey and Dorsey [30]. The recently reported partition coefficient data of Tellez et al [31] was also included in the new regression analysis.…”

Section: Full Papersmentioning

confidence: 99%

Linear Free Energy Relationship Correlation of The Distribution of Solutes Between Water And Cetytrimethylammonium Bromide (CTAB) Micelles

et al. 2009

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Data have been assembled from the published literature on the water-to-micellar Cetyltrimethylammonium Bromide (CTAB) partition coefficient data for more than 60 compounds, and on the Micellar Electrokinetic Chromatographic (MEKC) retention factors for more than 50 compounds measured on a CTAB pseudostationary phase. In total more than 200 experimental data have been compiled. The water-to-micellar CTAB partition coefficients and MEKC retention factor data from three separate studies have been combined into a single database and correlated with the Abraham model. The derived correlation described the 200 experimental values to within a standard deviation of 0.175 log units. Also, the previously derived Abraham model correlation for water-tomicellar Sodium Dodecylsulfate (SDS) was updated to include MEKC retention factor data from the five recent experimental studies. The new repression correlation for SDS is based on 706 experimental values. Principal component analysis showed that water-tomicellar surfactant partition systems are good models for non-polar and polar narcotic toxicities of organic compounds toward fish, water fleas, and other aquatic organisms.

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Section: Full Papersmentioning

confidence: 99%

Linear Free Energy Relationship Correlation of The Distribution of Solutes Between Water And Cetytrimethylammonium Bromide (CTAB) Micelles

et al. 2009

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“…A few earlier reports described the use of gemini surfactants as micelle‐forming reagents in MEKC, and found that the gemini surfactants exhibit better resolution or wider migration time windows than the commonly used single‐chained surfactants 10–12. Warner and coworkers 13, 14 and Bottaro and Van Biesen 15–17 systematically studied the use of anionic gemini surfactants as pseudostationary phases in MEKC, and presented some advantages of anionic gemini surfactants compared with conventionally used SDS. Due to their lower critical micelle concentrations, the gemini surfactants can be used at much lower concentrations than SDS.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, they can work better than SDS in separating particular sets of compounds, e.g. highly hydrophobic compounds 17. Recently, Liu et al .…”

Section: Introductionmentioning

confidence: 99%

Magnetism‐Tunable Oligoacene Dioxide Diradicals: Promising Magnetic Oligoacene‐Like Molecules

Yang¹,

Han²,

Zhao³

et al. 2012

ChemPhysChem

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Graphene oxide has attracted intense research interest recently because the graphene oxide synthesis route, as a promising alternative for cost-effective mass production of graphene, has been explored. To further study the oxidation process and possible mechanism and to explore applicability of the oxidized products, we have performed a computational study on three series of oligoacene dioxides, focusing on their structures and electronic properties. Taking 1,5-dioxidized naphthalene as a starting point, three series of oligoacene dioxides are considered as follows: 1) middle insertion by 1-2 benzene rings; 2) single-side expansion using 1-2 benzene rings; 3) double-side expansion using two benzene rings. On the basis of density functional theory and complete active space self-consistent field (CASSCF) calculations, we reveal that oligoacene dioxides in the middle insertion series have a triplet ground state, whereas those in the single-side expansion series and the double-side expansion series have open-shell broken-symmetry singlet diradical ground states except for their common origin naphthalene-1,5-dioxide whose ground state is triplet and which is also viewed as the origin of the middle insertion series. Magnetic coupling interactions of these oligoacene dioxides are also determined. This work should help people toward an atomistic understanding of the electronic structures and properties of possible intermediates or products and even the oxidation mechanism of graphene sheets, and provides a reasonable strategy of designing novel graphene-oxide-based magnetic materials.

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“…Moreover, they can work better than SDS in separating particular sets of compounds, e.g. highly hydrophobic compounds [17]. Recently, Liu et al reported that cationic gemini surfactants were good capillary coating materials for separation of proteins in aqueous media [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…A few earlier reports described the use of gemini surfactants as micelleforming reagents in MEKC, and found that the gemini surfactants exhibit better resolution or wider migration time windows than the commonly used single-chained surfactants [10][11][12]. Warner and coworkers [13][14] and Bottaro and Van Biesen [15][16][17] systematically studied the use of anionic gemini surfactants as pseudostationary phases in MEKC, and presented some advantages of anionic gemini surfactants compared with conventionally used SDS. Due to their lower critical micelle concentrations, the gemini surfactants can be used at much lower concentrations than SDS.…”

Section: Introductionmentioning

confidence: 99%

Use of gemini surfactants as semipermanent capillary coatings in aqueous‐organic solvents for capillary electrophoretic separation of inorganic anions

Liu

Yao

et al. 2009

J of Separation Science

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This paper proposes a new method for CE separation of inorganic anions based on the use of gemini surfactants as capillary coatings in mixed aqueous-organic solvents. The semipermanent gemini surfactant coatings were facilely prepared by rinsing the capillary with 18-s-18 solutions; they can keep be stable during the electrophoretic runs without surfactants in buffer. The coatings showed a good tolerance of methanol (MeOH) or ACN, e.g. at pH 8.0 and with 40% v/v MeOH or ACN, the EOF magnitude after 60 min of continuous electrokinetic rinsing only decreased by 2.9 or 6.0%, respectively. The coatings were successfully applied to the separation of inorganic anions. Adding organic solvents in buffer can effectively improve the resolution and efficiencies; however, it remarkably prolonged the analysis time due to the suppression of EOF. Interestingly, varying the spacer length of the gemini surfactants can also modulate (improve) the resolution but without any sacrifice of analysis time. This benefit was resulted from the unique chemical structures of gemini surfactants because it introduced a new variable, i.e. the spacer length, to the separation mechanism. IntroductionGemini surfactants are a relatively new type of surfactants, which have two hydrophobic chains and two polar headgroups linked by a spacer group [1][2][3]. Compared with the corresponding conventional (monomeric) single-chained surfactants, the gemini surfactants show better water solubility, lower critical micelle concentration, lower Krafft point, and better surface activity in aqueous solutions [2][3][4]. These features make the gemini surfactants very attractive in both academic and industrial worlds. In particular, the spacer group that can be hydrophilic or hydrophobic, flexible or rigid, heteroatomic, aromatic, etc., plays an important role in determining the solution properties of gemini surfactants [5][6][7][8][9]. In principle, the spacer group can connect any two identical or different surfactants among the available ones. Therefore, gemini surfactants are thought to be designable with an enormous variety of structures [3].Although gemini surfactants have recently generated much research interest, their applications in CE are still rare. Gemini surfactants can be good alternatives to other micelle-forming reagents, buffer additives and capillary coatings, thus it is rational to anticipate a bright prospect of application of gemini surfactants in CE. A few earlier reports described the use of gemini surfactants as micelleforming reagents in MEKC, and found that the gemini surfactants exhibit better resolution or wider migration time windows than the commonly used single-chained surfactants [10][11][12]. Warner and coworkers [13][14] and systematically studied the use of anionic gemini surfactants as pseudostationary phases in MEKC, and presented some advantages of anionic gemini surfactants compared with conventionally used SDS. Due to their lower critical micelle concentrations, the gemini surfactants can be used at much lower concentrat...

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Linear solvation energy relationships of anionic dimeric surfactants in micellar electrokinetic chromatography

Cited by 18 publications

References 35 publications

Linear Free Energy Relationship Correlation of The Distribution of Solutes Between Water And Cetytrimethylammonium Bromide (CTAB) Micelles

Linear Free Energy Relationship Correlation of The Distribution of Solutes Between Water And Cetytrimethylammonium Bromide (CTAB) Micelles

Magnetism‐Tunable Oligoacene Dioxide Diradicals: Promising Magnetic Oligoacene‐Like Molecules

Use of gemini surfactants as semipermanent capillary coatings in aqueous‐organic solvents for capillary electrophoretic separation of inorganic anions

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