Department of Chemistry, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747, Korea.
Rapid Commun Mass Spectrom. 2010 Sep;24(18):2753-8. doi: 10.1002/rcm.4701.
A mixture of a UV absorber (Tinuvin 234 or Tinuvin 329) and a UV stabilizer (Tinuvin 770) was analyzed using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) without any matrix. Fragmentation patterns of the UV absorbers and stabilizer were also investigated. The mass spectra showed the M+H ions and some fragment ions. Tinuvin 234, Tinuvin 329, and Tinuvin 770 generated three (m/z 119, 370, 432), one (m/z 252), and two (m/z 124 and 140) fragment ions, respectively. These fragment ions can be used to identify the chemical structures of the UV absorbers and stabilizer. Since the UV absorber performed a role as the matrix, the ion abundance of the UV stabilizer was enhanced by mixing with the UV absorber. When organic materials extracted from polypropylene (PP) containing the UV absorber and stabilizer were directly analyzed using MALDI-MS without any matrix, the protonated molecule of the UV stabilizer was detected in abundance but the product ions of the UV absorber were not observed. When 2,5-dihydroxybenzoic acid was used as a matrix, the protonated molecule of the UV absorber was observed.
将一种紫外线吸收剂（Tinuvin 234 或 Tinuvin 329）和一种紫外线稳定剂（Tinuvin 770）的混合物进行了分析，使用基质辅助激光解吸/电离质谱（MALDI-MS），无需任何基质。还研究了紫外线吸收剂和稳定剂的碎片模式。质谱显示了[M+H]+离子和一些碎片离子。Tinuvin 234、Tinuvin 329 和 Tinuvin 770 分别生成三个（m/z 119、370、432）、一个（m/z 252）和两个（m/z 124 和 140）碎片离子。这些碎片离子可用于识别紫外线吸收剂和稳定剂的化学结构。由于紫外线吸收剂起到了基质的作用，因此与紫外线吸收剂混合后，紫外线稳定剂的离子丰度得到了增强。当直接使用 MALDI-MS 分析含有紫外线吸收剂和稳定剂的聚丙烯（PP）中的有机材料而不使用任何基质时，大量检测到紫外线稳定剂的质子化分子，但未观察到紫外线吸收剂的产物离子。当使用 2,5-二羟基苯甲酸作为基质时，观察到了紫外线吸收剂的质子化分子。
