Evaluation of complex spectral-pH three-way arrays by modified bilinear least-squares: determination of four different dyes in interfering systems.
Evaluation of complex spectral-pH three-way arrays by modified bilinear least-squares: determination of four different dyes in interfering systems.
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通过改进的双线性最小二乘法评估复杂的光谱-pH 三向阵列：干扰系统中四种不同染料的测定。
DOI：
10.1039/b504378f
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. Olivieri
中科院分区：
文献类型：
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作者：
Nilda R. Marsili;A. Lista;B. F. Band;H. Goicoechea;A. Olivieri
本文首次将改进的双线性最小二乘模型应用于复杂样品的吸光度-pH二阶数据。后者由水果饮料粉组成，其中有四种不同的分析物和额外的背景成分。分析物是常见的果汁着色剂柠檬黄、黄日落、金银红和青色胭脂红。这些数据是在流动注射系统中产生双pH梯度后测量的。所选择的化学计量学方法充分利用了二阶优势，需要考虑真实样品中存在的背景干扰。由于在工作pH范围内各着色剂的酸碱形式之间存在严重的光谱重叠，其他二阶多元校正方法如平行因子分析和多元曲线分解-交替最小二乘法不能成功地应用于目前所研究的样品。在实际测试样品中，黄日落、靛红、金兰红和柠檬黄的回收率分别为94.8%、104.7%、109.3%和105.3%。
This article reports on the first application of a modified version of the bilinear least-squares model to absorbance-pH second-order data recorded for complex samples. The latter are composed of fruit drink powders, where four different analytes and additional background components occur. The analytes are the common juice colorants tartrazine, yellow sunset, allura red and indigo carmine. The data have been measured after generating a double pH gradient within a flow injection system. The selected chemometric methodology adequately exploits the second-order advantage, needed to take into account the background interferents present in real samples. Due to severe spectral overlapping between the acid and basic forms of each of the colorants in the working pH range, other second-order multivariate calibration methods such as parallel factor analysis and multivariate curve resolution-alternating least-squares could not be successfully applied to the presently studied samples. Recoveries of 94.8, 104.7, 109.3 and 105.3% were obtained for yellow sunset, indigo carmine, allura red and tartrazine respectively in the real test samples.