【摘 要】
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Transient ITP (tITP), usually performed in CZE, is a useful on-line sample preconcentration technique for high saline sample.Only a few papers have applied
【机 构】
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Key Laboratory of Chemistry of Northwestern Plant Resources, CAS/ Key Laboratory for Natural Medicin
【出 处】
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第2届大连国际色谱学术报告会、第37届国际高效液相色谱及相关技术会议、第18届全国色谱学术报告会
论文部分内容阅读
Transient ITP (tITP), usually performed in CZE, is a useful on-line sample preconcentration technique for high saline sample.Only a few papers have applied tITP in MEKC especially SDS system.This study compared two tITP methods in CZE and MEKC for 3-nitro-tyrosine (NT) analysis in urine.No sample clean-up was required.Self-stacking occurred simultaneously as chloride in urine acted as a leading ion.HEPES-Tris (50 mM) at pH 8.2 was used as a terminating electrolyte and separation buffer.UV detection wavelength was set at 426 nm.Experiments showed that fITP in MEKC exhibited peak efficiency exceeding one million plates, higher than that of tITP in CZE, due to an additional high-salt stacking effect.Sensitivities were improved 81 and 21-fold, respectively.In addition, the proposed preconcentration principle of tITP in MEKC was supported by computer simulations using Simu 5.
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