Determination of Methylarginines in Infant Plasma by CE-LIF.

Determination of Methylarginines in Infant Plasma by CE-LIF.
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通过 CE-LIF 测定婴儿血浆中的甲基精氨酸。

DOI:
10.1039/c4ay00340c
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发表时间:
2014
期刊:
Analytical methods : advancing methods and applications
影响因子:
--
通讯作者:
Lunte,SusanM
Lunte,SusanM
中科院分区:
--
文献类型:
--
作者:
Linz,ThomasH;Lunte,SusanM

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甲基精氨酸(MA)是一类一氧化氮合酶抑制剂,与危重婴儿的呼吸系统并发症有关。本文介绍了一种分析方法的发展,以测量这些化合物在新生儿血浆中使用毛细管电泳(CE)。优化了CE分离方法,使四个MA类似物的完整基线分辨率。通过验证用于分析血浆基质中低体积(≤100 μL)样本的热辅助提取方法,解决了婴儿来源样本的样本制备问题。经确定,样品基质(血浆与血清)不影响测得的MA浓度,而提取较小体积的经历热诱导凝胶化的血浆,其MA回收率高于较大体积的样品。然后将这些方法应用于从新生儿重症监护室中的婴儿收集的血液样本。结果发现,这些新生儿在较年轻时(<6个月)的MA浓度显著升高,而6个月大的婴儿和成人之间的含量相似。这些数据是初步的,但证明了一个有趣的年龄依赖于这些一氧化氮抑制剂的浓度,这是以前没有报道。
Methylarginines (MAs) are a class of nitric oxide synthase inhibitors that have been implicated in respiratory complications of critically ill infants. This paper describes the development of an analytical method to measure these compounds in the plasma of newborns using capillary electrophoresis (CE). The CE separation method was optimized to enable complete baseline resolution of the four MA analogues of interest. Sample preparation concerns for infant-derived samples were addressed by validating a heat-assisted extraction method for the analysis of low volume (≤100 μL) samples from a plasma matrix. It was determined that the sample matrix (plasma versus serum) did not affect the measured MA concentrations, while extracting smaller volumes of plasma that underwent heat-induced gelation afforded higher MA recoveries than larger volume samples. These methods were then applied to blood samples collected from infants housed in the neonatal intensive care unit. It was discovered that these newborns had significantly elevated concentrations of MAs at younger ages (<6 months) while amounts were similar between infants 6 months old and adults. The data are preliminary, but demonstrate an interesting age dependence on the concentrations of these nitric oxide inhibitors, which has not been previously reported.
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