Department of Chemistry, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747, Korea.
Analyst. 2013 Feb 21;138(4):1256-61. doi: 10.1039/c2an35718f.
Co-matrix systems composed of a UV absorber and a UV stabilizer applied to the analysis of polystyrene (PS) using a matrix-assisted laser desorption/ionization-mass spectrometer (MALDI-MS) equipped with a N(2) laser (337 nm) as the light source were investigated. Various UV absorbers such as Tinuvin 234, Tinuvin 326, Tinuvin 327, Tinuvin 328, Tinuvin 329, and Tinuvin 1577 and a UV stabilizer of Tinuvin 770 were used. Analytical results using the co-matrix systems were compared with those using anthracene-1,8,9-triol (DIT) as the most common matrix for PS analysis. The MALDI mass spectrum of PS obtained using single DIT showed higher ionization efficiency than that using a mixture of DIT and Tinuvin 770 as the matrix. In contrast to this, for the UV absorbers, the ionization efficiencies were notably enhanced by using the co-matrix systems of the UV absorber and Tinuvin 770. The analytical results were explained with the enhanced compatibility with PS by the formation of a complex between the UV absorber and Tinuvin 770 and with the capability of transferring silver cations. Prices of Tinuvin 770 and the UV absorbers are much cheaper than those of the common matrices. The co-matrix systems are recommendable for the MALDI-MS analysis of PS, especially the co-matrix system composed of Tinuvin 234 and Tinuvin 770.
采用基质辅助激光解吸/电离质谱仪（MALDI-MS），以氮气激光（337nm）作为光源，研究了由紫外线吸收剂和紫外线稳定剂组成的共基质体系在分析聚苯乙烯（PS）中的应用。实验中使用了多种紫外线吸收剂，如 Tinuvin 234、Tinuvin 326、Tinuvin 327、Tinuvin 328、Tinuvin 329 和 Tinuvin 1577，以及紫外线稳定剂 Tinuvin 770。将共基质体系的分析结果与最常用于 PS 分析的蒽-1,8,9-三醇（DIT）基质的分析结果进行了比较。使用单一 DIT 获得的 PS 的 MALDI 质谱显示出比使用 DIT 和 Tinuvin 770 的混合物作为基质更高的离子化效率。与此相反，对于紫外线吸收剂，使用紫外线吸收剂和 Tinuvin 770 的共基质体系可显著提高其离子化效率。通过紫外线吸收剂和 Tinuvin 770 形成复合物以及转移银阳离子的能力，解释了分析结果。Tinuvin 770 和紫外线吸收剂的价格远低于常用基质的价格。共基质体系可用于 PS 的 MALDI-MS 分析，尤其是由 Tinuvin 234 和 Tinuvin 770 组成的共基质体系。
