Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Synthesis and evaluation of polymer based zwitterionic stationary phases for separation of tonic species
Autore:
Jiang, W; Irgum, K;
Indirizzi:
Umea Univ, Dept Chem, S-90187 Umea, Sweden Umea Univ Umea Sweden S-90187Umea Univ, Dept Chem, S-90187 Umea, Sweden
Titolo Testata:
ANALYTICAL CHEMISTRY
fascicolo: 9, volume: 73, anno: 2001,
pagine: 1993 - 2003
SICI:
0003-2700(20010501)73:9<1993:SAEOPB>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTROSTATIC ION CHROMATOGRAPHY; PAIR CHROMATOGRAPHY; ANIONS; SELECTIVITY; EXCHANGERS; MICELLES; NUCLEOTIDES; MECHANISM; BEHAVIOR; ELUENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Irgum, K Umea Univ, Dept Chem, S-90187 Umea, Sweden Umea Univ Umea Sweden S-90187 , Dept Chem, S-90187 Umea, Sweden
Citazione:
W. Jiang e K. Irgum, "Synthesis and evaluation of polymer based zwitterionic stationary phases for separation of tonic species", ANALYT CHEM, 73(9), 2001, pp. 1993-2003

Abstract

Three different zwitterionic functional stationary phases for chromatography were synthesized on the basis of 2-hydroxyethyl methacrylate (HEMA) polymeric particles. Two synthesis routes? producing materials designated S300-ECH-DMA-PS or S300-TC-DMA-PS, involved activation of the hydroxyl groups ofthe HEMA material with epichlorohydrin or thionyl chloride, respectively, followed by dimethylamination and quaternizing 3-sulfopropylation with 1,3-propane sultone, The third route was accomplished by attaching methacrylatemoieties to the HEMA through a reaction with methacrylic anhydride, followed by graft photopolymerization of the zwitterionic monomer 3-[N,N-dimethyl-N(methacryloyloxyethyl)ammonium] propanesulfonate, initiated by benzoin methyl ether under 365-nm light. According to elemental analyses, both the S300-ECH-DMA-PS and S300-TC-DMA-PS materials appeared to have overall charge stoichometries close to unity, whereas the grafted material, S300-MAA-SPE, seemed to carry an excess cf anion exchange sites in addition to the zwitterionic groups. Yet all three zwitterionic stationary phases were capable ofseparating inorganic anions and cations simultaneously and independently using aqueous solutions of perchloric acid or perchlorate salts as eluent, albeit with markedly different selectivities. On the S300-TC-DMA-PS and S300-MAA-SPE materials, tire retention times increased for cations and decreased for anions with increasing eluent concentration, whereas with the S300-ECH-DMA-PS material, the retention times of both anions and cations decreasedwith increasing eluent concentration, These results demonstrate the importance of choosing appropriate synthesis conditions in order to prepare covalently bonded zwitterionic separation materials with an acceptable charge balance.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/20 alle ore 01:37:52