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Photometric flow analysis system for biomedical investigations of iron/transferrin speciation in human serum
Analytica Chimica Acta ( IF 6.2 ) Pub Date : 2017-12-01 , DOI: 10.1016/j.aca.2017.10.015
Kamil Strzelak , Natalia Rybkowska , Agnieszka Wiśniewska , Robert Koncki

The Multicommutated Flow Analysis (MCFA) system for the estimation of clinical iron parameters: Serum Iron (SI), Unsaturated Iron Binding Capacity (UIBC) and Total Iron Binding Capacity (TIBC) has been proposed. The developed MCFA system based on simple photometric detection of iron with chromogenic agent (ferrozine) enables a speciation of transferrin (determination of free and Fe-bound protein) in human serum. The construction of manifold was adapted to the requirements of measurements under changing conditions. In the course of studies, a different effect of proteins on SI and UIBC determination has been proven. That was in turn the reason to perform two kinds of calibration methods. For measurements in acidic medium for SI/holotransferrin determination, the calibration curve method was applied, characterized by limit of determination and limit of quantitation on the level of 3.4 μmol L-1 and 9.1 μmol L-1, respectively. The determination method for UIBC parameter (related to apotransferrin level) in physiological medium of pH 7.4 forced the use of standard addition method due to the strong influence of proteins on obtaining analytical signals. These two different methodologies, performed in the presented system, enabled the estimation of all three clinical iron/transferrin parameters in human serum samples. TIBC corresponding to total transferrin level was calculated as a sum of SI and UIBC.

中文翻译:

用于人血清中铁/转铁蛋白形态生物医学研究的光度流量分析系统

已经提出了用于估计临床铁参数的多变流分析 (MCFA) 系统:血清铁 (SI)、不饱和铁结合能力 (UIBC) 和总铁结合能力 (TIBC)。开发的 MCFA 系统基于使用显色剂(亚铁嗪)对铁进行简单的光度检测,可以实现人血清中转铁蛋白的形态形成(游离和 Fe 结合蛋白的测定)。歧管的构造适应了变化条件下的测量要求。在研究过程中,蛋白质对 SI 和 UIBC 测定的不同影响已被证明。这又是执行两种校准方法的原因。对于在酸性介质中测定 SI/全转铁蛋白的测量,应用了校准曲线方法,其特点是测定限和定量限分别为 3.4 μmol L-1 和 9.1 μmol L-1。由于蛋白质对获得分析信号的强烈影响,pH 7.4 生理介质中 UIBC 参数(与载脂蛋白水平相关)的测定方法迫使使用标准添加方法。在所提出的系统中执行的这两种不同的方法能够估计人血清样品中的所有三个临床铁/转铁蛋白参数。对应于总转铁蛋白水平的 TIBC 计算为 SI 和 UIBC 的总和。由于蛋白质对获得分析信号的强烈影响,4 强制使用标准添加方法。在所提出的系统中执行的这两种不同的方法能够估计人血清样品中的所有三个临床铁/转铁蛋白参数。对应于总转铁蛋白水平的 TIBC 计算为 SI 和 UIBC 的总和。由于蛋白质对获得分析信号的强烈影响,4 强制使用标准添加方法。在所提出的系统中执行的这两种不同的方法能够估计人血清样品中的所有三个临床铁/转铁蛋白参数。对应于总转铁蛋白水平的 TIBC 计算为 SI 和 UIBC 的总和。
更新日期:2017-12-01
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