Hydrophobic solid phase extraction using n-alkanoic acid-immobilized anion-exchange membranes as adsorbents

Hong, Song; Chen, Siao-Jhen; Chiu, Hsin-Chieh; Sulejmanovic, Dino; Conte, Eric D.; Suen, Shing‐Yi

doi:10.1016/j.microc.2008.05.001

Cited by 5 publications

(4 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak at the lower temperature is likely to originate from surfactant in the layer interfacing aqueous media, while higher temperatures are required to remove surfactant immobilized to the solid surface. [15][16][17] Zeta potential measurements further confirm the bilayer nature of the surfactant phase. A zeta potential of À44.58 AE 0.36 mV was obtained for unmodified silica, while that of silica modified with dimethyldipalmitylammonium hydroxide was 35.78 AE 2.03 mV.…”

Section: Resultsmentioning

confidence: 66%

Dihexadecyldimethylammonium hydroxide admicelles on silica for the preconcentration of selected phenols

Chen

Suen

Vied

et al. 2009

Analyst

Self Cite

View full text Add to dashboard Cite

Admicelle based extractions, where sorbents used are prepared by immobilizing charged surfactants in a bilayer arrangement onto a silica or aluminum oxide surface, have been used for preconcentrating a wide variety of analytes. These analytes have a certain degree of hydrophobicity interacting with the alkyl chains of the surfactant or they are counter-charged interacting electrostatically with the charged polar group of the surfactant. Weakly hydrophobic molecules are more challenging to efficiently extract onto this type of medium. Presented is an admicelle extraction procedure for extracting weak acid phenols. An acid-base reaction takes place between modified surfactants containing hydroxide counter ions and weak acid phenols. The result of this reaction is the production of phenolate ions that remain counter to the cationic surfactant. The acid-base reaction together with the fluid nature of the surfactant phase protects the phenolate ions from being removed by counter ions in natural solutions. High extraction efficiencies result.

show abstract

Section: Resultsmentioning

confidence: 66%

Dihexadecyldimethylammonium hydroxide admicelles on silica for the preconcentration of selected phenols

Chen

Suen

Vied

et al. 2009

Analyst

Self Cite

View full text Add to dashboard Cite

show abstract

“…Doxepin, a basic antidepressant drug, has a pKa between 8 and 10 [20,25]. Its amine groups became protonated at pH 6 to form a cation [19,20,25], which may be repelled by the copper(II) ions. At pH 10, doxepin was in a predominately neutral form and more hydrophobic for adsorption.…”

Section: Batch Adsorption/desorption Results For 2-naphthol and Doxepinmentioning

confidence: 99%

“…The species tested in this study were bisphenol-A, 2-naphthol, and doxepin, which are hazardous materials or PPCPs (pharmaceutical and personal care products) ubiquitous in the environment. As indicated in literature [19][20][21][22][23][24][25][26][27], these three pollutant species could be adsorbed and removed from water by various sorbents via charge, acid-basic, -, or hydrophobic interactions. The sorbents adopted and reported in recent years include specific polymeric adsorbents and membranes [19,22], modified clay materials [3,[23][24][25][26], surfactant-modified ion-exchange membranes [20,21], molecularly imprinted silica [27], polyaniline-coated Fe 3 O 4 nanomaterials [4], etc.…”

Section: Introductionmentioning

confidence: 88%

Trap and release of bisphenol-A, 2-naphthol, and doxepin using a 1-hexadecylamine-copper(II)-amine functionalized indium-tin-oxide electrode

Lin

Biechele-Speziale

Ernst

et al. 2016

Chemical Engineering Journal

Self Cite

View full text Add to dashboard Cite

An electrically controlled and renewable hydrophobic surface used to trap and release three test pollutants on an indium-tin-oxide (ITO) electrode is presented. Oxygen plasma was used to maximize the activated hydroxyl groups on the ITO surface, which were reacted with (3aminopropyl) triethoxysilane (APTES) to create a 3-amino propyl layer. Copper(II) ions were introduced and attached to the terminal amine groups. The amine group from 1-hexadecylamine (HDA), complexed the surface-confined copper(II) ions, which resulted in terminal hexadecyl alkyl groups. The created hydrophobic surface was tested for its ability to adsorb pollutant substances, namely bisphenol-A, 2-naphthol, and doxepin. Desorption was accomplished by reducing copper(II) to copper(0) electrochemically. This led to the weakening of the metal-amine complex and the concomitant detachment of the HDA and trapped species from the ITO surface. Efficient trapping and releasing of bisphenol-A (1 ppm) was achieved with around 84% adsorption, 100% desorption (in a time course of less than 30 seconds), and 42-fold enrichment on the concentration. After each adsorption/desorption trial, regeneration of the hydrophobic surface was achieved by reapplication of copper(II) ions and HDA. Five cycles were successfully repeated without any significant deterioration in performance. Similar trap-and-release performance was also attained for 2-naphthol and doxepin.

show abstract

“…Liquid-liquid extraction (LLE) [6][7][8][9] and solid-phase extraction (SPE) [1,2,[10][11][12][13][14][15] have been the most frequently employed techniques for drug extraction from biological fluids. These classic methods usually consume organic solvents, not to mention that they are laborious and time consuming.…”

Section: Introductionmentioning

confidence: 99%

Solid-phase microextraction using poly(pyrrole) film and liquid chromatography with UV detection for analysis of antidepressants in plasma samples

Chaves

Júnior

Queiroz

2009

Journal of Chromatography B

View full text Add to dashboard Cite

Hydrophobic solid phase extraction using n-alkanoic acid-immobilized anion-exchange membranes as adsorbents

Cited by 5 publications

References 17 publications

Dihexadecyldimethylammonium hydroxide admicelles on silica for the preconcentration of selected phenols

Dihexadecyldimethylammonium hydroxide admicelles on silica for the preconcentration of selected phenols

Trap and release of bisphenol-A, 2-naphthol, and doxepin using a 1-hexadecylamine-copper(II)-amine functionalized indium-tin-oxide electrode

Solid-phase microextraction using poly(pyrrole) film and liquid chromatography with UV detection for analysis of antidepressants in plasma samples

Contact Info

Product

Resources

About