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Titolo:
On-line deproteinization by adsorption of proteins on a polyethylene powder pre-column for the determination of Na, K, Mg and Ca in human serum by high-performance liquid chromatography
Autore:
Bohrer, D; do Nascimento, PC; Mendonca, JKA;
Indirizzi:
Univ Fed Santa Maria, Dept Chem, BR-97110900 Santa Maria, RS, Brazil Univ Fed Santa Maria Santa Maria RS Brazil BR-97110900 BCaria, RS, Brazil
Titolo Testata:
JOURNAL OF CHROMATOGRAPHY B
fascicolo: 1, volume: 750, anno: 2001,
pagine: 61 - 69
SICI:
1387-2273(20010105)750:1<61:ODBAOP>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIBRINOGEN ADSORPTION; ION CHROMATOGRAPHY; BLOOD-PLASMA; SAMPLES;
Keywords:
proteins; sodium; potassium; magnesium; calcium; polyethylene;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Bohrer, D Univ Fed Santa Maria, Dept Chem, BR-97110900 Santa Maria, RS, Brazil Univ Fed Santa Maria Santa Maria RS Brazil BR-97110900 BCBrazil
Citazione:
D. Bohrer et al., "On-line deproteinization by adsorption of proteins on a polyethylene powder pre-column for the determination of Na, K, Mg and Ca in human serum by high-performance liquid chromatography", J CHROMAT B, 750(1), 2001, pp. 61-69

Abstract

Deproteinization of human serum was carried out on-line using a polyethylene powder cartridge as pre-column. The serum sample, after dilution, was injected into the chromatograph, and when passing through the cartridge the proteins were adsorbed by the polyethylene. A protein-free eluate was carried to the analytical column while the pre-column was washed with methanol and water to elute the adsorbed proteins by changing the pump channels. Afterwashing, the pre-column was conditioned with the eluent to receive the next sample. Deproteinization was evaluated off- and on-line using pooled serum, and testing the protein residue after passing through a polyethylene cartridge with the Comassie Brilliant Blue reaction. Parameters such as serum volume, eluent and washing solution were investigated. Sodium, potassium, magnesium and calcium determinations were performed by high-performance liquid chromatography with conductimetric detection. The proposed method is suitable for the determination of these cations in serum samples without further treatments. The total analysis time was about 20 min and a linear range from 0.3 to 1.2 mg/l for sodium, potassium, magnesium and calcium was observed. The method was characterized by a precision of about 95% and recoveries from spiked samples were between 96 and 102%. The results for serum samples analysed by the proposed method were compared with photometry and atomicabsorption spectrometry. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 13:44:11