紫外可见主成分分析法对蓝色签字笔油墨的分类研究

本文采用薄层色谱法和紫外可见光谱法分析33支蓝色签字笔油墨。截取400～700 nm之间的紫外可见光谱数据进行主成分分析。主成分(PC)分析结果表明主成分1、2和3的累积贡献率已达86.84%,以主成分1、2对所有样品的得分值作图,结果显示时不同品牌的蓝色签字笔有很好的聚类作用。将主成分分析的分类结果同薄层色谱法的分类结果相比较,结果表明,采用主成分分析技术可以达到对蓝色签字笔墨字迹的良好识别。

Characterization of blue gel pen inks using principal component analysis of UV vis absorption spectra

Thirty three blue gel pens inks were examined on the basis of UV-Vis spectrum with a view to achieving good discrimination between them.Samples were dissolved in DMF,their absorbance values in the range of 400～700 nm,after appropriate transformations, were used as variables in principal component analysis.The analysis suggested that the cumulate reliability of PC1,PC2 and PC3(the first three principal components)were more than 86%,and the 2-dementional plot was drawn with the scores of PC1 and PC2,which was a good clustering analysis for discrimination of these pens.Compared to the result of TLC,it was found the PCA could provide a good method for the discrimination of blue gel pen.