Determination of selenium in serum in the presence of gadolinium with ICP-QQQ-MS.
Analyst
; 140(8): 2842-6, 2015 Apr 21.
Article
en En
| MEDLINE
| ID: mdl-25730383
Gadolinium (Gd)-based magnetic resonance imaging (MRI) contrasting agents interfere with the determination of selenium (Se) when analysed by single quadrupole inductively coupled plasma-mass spectrometry (ICP-MS). This paper demonstrates that an ICP-triple quadrupole-MS (ICP-QQQ-MS) with oxygen mass shift overcomes Gd(++) interference on Se(+) and mitigates typically encountered matrix and spectral based interferences. Normal human serum was diluted in a solution containing isopropanol, EDTA, NH4OH and Triton X-100. Samples were unspiked (control) serum; serum spiked with 0.127 µmol L(-1) Se or 127 µmol L(-1) Gd; and serum spiked with both 0.127 µmol L(-1) Se and 127 µmol L(-1) Gd. Consideration of collision/reaction gases and conditions for interference mitigation included helium (He); a 'low' and 'high' hydrogen (H2) flow, and oxygen (O2). The instrument tune for O2 was optimised for effective elimination of interferences via a mass shift reaction of Se(+) to SeO(+). The ICP-QQQ-MS was capable of detecting trace (>9.34 nmol L(-1)) levels of Se in serum in the presence of Gd in our simulated post-MRI serum sample. The multi-tune capabilities of the ICP-QQQ-MS may be adapted to eliminate other specific isobaric interferences that cause false positive results in other analyses where the analyte is confounded by doubly charged and/or polyatomic species.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Selenio
/
Espectrometría de Masas
/
Análisis Químico de la Sangre
/
Gadolinio
Idioma:
En
Revista:
Analyst
Año:
2015
Tipo del documento:
Article
País de afiliación:
Australia