Determination of nineteen organonitrogen pesticides in Paeoniae Radix Alba by capillary electrophoresis-mass spectrometry / 浙江大学学报·医学版
Journal of Zhejiang University. Medical sciences
;
(6): 25-31, 2012.
Artigo
em Chinês
| WPRIM
| ID: wpr-247188
ABSTRACT
<p><b>OBJECTIVE</b>To establish a capillary electrophoresis-mass spectrometry(CE-MS) method for the analysis of nineteen organonitrogen pesticides in Paeoniae Radix Alba.</p><p><b>METHODS</b>CE-MS analysis was performed on a 70 cm X 50 μm fused-silica capillary. The optimal buffer was composed of 1 % formic acid and 15 % methanol(V/V, pH 2.2). The temperature of capillary was controlled at 25 degree. The separation voltage was +20 kV. The optimal MS parameters were as follows ESI-MS analysis was performed in the positive mode; 90 % methanol containing 0.2 % formic acid with a flow rate of 8 μl·min(-1) was selected as the sheath liquid; the flow rate and temperature of drying gas were 6 L·min(-1) and 250 degree, respectively; The nebulizing gas pressure was set at 5 psig; The optimal values of fragmentor and ESI voltage were 100 V and 5 000 V, respectively.</p><p><b>RESULTS</b>The nineteen pesticides had good linearity over the testing ranges. The average recoveries were in the range of 80.1 %-108.4 % with RSDs less than 20 % (except ethoxyquin and spiroxamine, those of which were 29.2 % and 22.3 % at 0.01 mg.kg(-1) concentration level). The LODs of nineteen pesticides were 0.503 ≊10.1 μg.kg(-1).</p><p><b>CONCLUSION</b>The method can be used effectively to analyze the nineteen organonitrogen pesticides residue in Paeoniae Radix Alba.</p>
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Espectrometria de Massas
/
Resíduos de Praguicidas
/
Química
/
Eletroforese Capilar
/
Paeonia
/
Métodos
Idioma:
Chinês
Revista:
Journal of Zhejiang University. Medical sciences
Ano de publicação:
2012
Tipo de documento:
Artigo
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