Retention behaviour of nonylphenyl ethyleneoxide oligomers on alumina columns

Forgács, Esther; Cserháti, Tibor

doi:10.1007/bf00323350

Cited by 11 publications

(3 citation statements)

References 5 publications

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“…For these reasons, a derivatization procedure addressed to add a chromophore or a charge to the oligomers, previous to the separation by CE, was needed. Derivatizing reagents such as 3,5‐dinitrobenzoyl chloride 1, 27, 28, phthalic anhydride 11, 12, 29, PIC 30–32, 1‐naphthylisocyanate 33, 1,2,4‐benzenetricarboxylic anhydride 3 and FMOC‐Cl 34 have been used. In all cases, high temperatures and long reaction times are required, as well as the presence of catalysts.…”

Section: Resultsmentioning

confidence: 99%

Analytical characterization of PEG polymers by MEKC

2010

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Characterization of PEGs with average molecular masses of up to 2000 has been achieved using MEKC with UV detection. A rapid derivatization procedure with phenyl isocyanate using microwave radiation, in order to introduce chromophore groups in PEGs, has been developed involving a reaction time of 60 s. Different optimized conditions in accordance with the molecular weight have been studied to obtain the oligomer separation. The weight-average molecular mass the number-average molecular mass and the degree of polydispersity (molecular mass distribution) were calculated for the different PEGs obtaining similar results with those certified for standards. A good precision was obtained for characterizing the different oligomers. Ethylene glycol was used as the internal standard for the analysis of low-molecular-weight PEGs. The developed method was satisfactorily applied to the characterization of these polymers in several real samples, such as lubricant eye drops, toothpaste, tap water and eye make-up remover.

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Section: Resultsmentioning

confidence: 99%

Analytical characterization of PEG polymers by MEKC

2010

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“…Although materials such as alumina [94][95][96][97][98][99] and zirconia [105][106][107] have been studied to some extent, the greatest number of HPLC separations have been carried out on some form of silica-based material. This is due in part to the high efficiency and structural stability of bonded silica columns.…”

Section: Silica-based Stationary Phasesmentioning

confidence: 99%

“…Alumina was also a popular material in early separations [9,94,95] as well as more recent work [96][97][98][99].…”

Section: Normal-phase Modelsmentioning

confidence: 99%

Liquid chromatographic retention studies using polystyrene-divinylbenzene stationary phases in reversed-phase and normal-phase eluents

Chambers

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This manuscript has been rqsroduced from the microfilm master. UMI films the text directly fiom the ori^nal or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be fi'om any type of computer printer.The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.In the unlikdy event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.Oversize nuiterials (e.g., m^s, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overlaps. Each original is also photognq)hed in one exposure and is included in reduced form at the back of the book.

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High-performance liquid chromatography and detection of polyethers and their mono(carboxy)alkyl and -arylalkyl substituted derivatives

Rißler

1996

Journal of Chromatography A

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Retention behaviour of nonylphenyl ethyleneoxide oligomers on alumina columns

Cited by 11 publications

References 5 publications

Analytical characterization of PEG polymers by MEKC

Analytical characterization of PEG polymers by MEKC

Liquid chromatographic retention studies using polystyrene-divinylbenzene stationary phases in reversed-phase and normal-phase eluents

High-performance liquid chromatography and detection of polyethers and their mono(carboxy)alkyl and -arylalkyl substituted derivatives

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