Capillary electrophoresis coupled with chloroform-acetonitrile extraction for rapid and highly selective determination of cysteine and homocysteine levels in human blood plasma and urine.
Electrophoresis
; 38(20): 2646-2653, 2017 10.
Article
em En
| MEDLINE
| ID: mdl-28681932
ABSTRACT
A rapid and selective method has been developed for highly sensitive determination of total cysteine and homocysteine levels in human blood plasma and urine by capillary electrophoresis (CE) coupled with liquid-liquid extraction. Analytes were first derivatized with 1,1'-thiocarbonyldiimidazole and then samples were purified by chloroform-ACN extraction. Electrophoretic separation was performed using 0.1 M phosphate with 30 mM triethanolamine, pH 2, containing 25 µM CTAB, 2.5 µM SDS, and 2.5% polyethylene glycol 600. Samples were injected into the capillary (with total length 32 cm and 50 µm id) at 2250 mbar*s and subsequent injection was performed for 30 s with 0.5 M KÐÐ. The total analysis time was less than 9 min, accuracy was 98%, and precision was <2.6%. The LOD was 0.2 µM for homocysteine and 0.5 µM for cysteine. The use of liquid-liquid extraction allowed the precision and sensitivity of the CE method to be significantly increased. The validated method was applied to determine total cysteine and homocysteine content in human blood plasma and urine samples obtained from healthy volunteers and patients with kidney disorders.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Eletroforese Capilar
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Cisteína
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Extração Líquido-Líquido
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Homocisteína
Tipo de estudo:
Diagnostic_studies
Limite:
Adolescent
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Adult
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Aged
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Aged80
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Female
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Humans
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Middle aged
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article