Fast polymer fingerprinting using flowing afterglow atmospheric pressure glow discharge mass spectrometry
Fast polymer fingerprinting using flowing afterglow atmospheric pressure glow discharge mass spectrometry
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DOI：
10.1039/b819560a
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发表时间：
2009-01-01
期刊：
影响因子：
4.2
通讯作者：
Zenobi, Renato
中科院分区：
文献类型：
--
作者：
Jecklin, Matthias C.;Gamez, Gerardo;Zenobi, Renato
流动余辉大气压辉光放电质谱（FA - APGD - MS）被用于检测不同的聚合物种类，例如生物聚合物、合成均聚物和共聚物。FA - APGD - MS用于聚合物样品的主要优势包括速度快（每个样品<30秒）以及在大气压下进行分析。此外，对于可分析的聚合物样品种类基本上没有限制，因为FA - APGD - MS能够处理液态和固态（可溶或不可溶）的块状聚合物和颗粒，无论其导电性如何，在分析前无需任何样品制备。我们将根据从所获得的质谱中能够获取何种信息，来讨论离子形成的机制以及可达到的质量范围（m/z <500）的局限性。对于均聚物，例如顺式聚异戊二烯（IR）、聚乙二醇（PEG）、聚对苯二甲酸乙二醇酯（PET），检测到了单体单元和一些碎片，这使得能够确定聚合物的组成。为了更好地可视化以及评估质谱的重现性，使用主成分分析（PCA）对所获得的质谱进行了进一步处理。与PCA结合甚至能够区分果胶、支链淀粉和纤维素，这些在化学上非常相似的多糖，其特征差异在于糖苷键的性质。最后，我们能够检测并识别出存在于聚氯乙烯基食品包装中的邻苯二甲酸酯类增塑剂，邻苯二甲酸双（2 - 乙基己基）酯（BEHP）和邻苯二甲酸二丁酯（DBP）。
Flowing afterglow atmospheric pressure glow discharge mass spectrometry (FA-APGD-MS) was used to interrogate different polymer species such as biopolymers, synthetic homo-and co-polymers. The main advantages of FA-APGD-MS for polymer samples include speed (< 30 s per sample) and analysis at atmospheric pressures. Moreover, there are essentially no restrictions as to the kind of polymer sample that can be analyzed because FA-APGD-MS can deal with liquid and solid (soluble or insoluble) bulk polymers and granulates, irrespective of their conductivity, without requiring any sample preparation prior to analysis. We will discuss the mechanism of ion formation as well as the limitation of the accessible mass range (m/z < 500) in view of what type of information can be gained from the mass spectra obtained. Monomer units and some fragments were detected for homopolymers, e. g. cis-polyisoprene (IR), poly(ethylene glycol) (PEG), poly(ethylene terephthalate) (PET), which allowed identification of the polymer composition. The mass spectra obtained were further processed using principal component analysis (PCA) for a better visualization and assessing of mass-spectral reproducibility. Combination with PCA even allowed differentiation of pectin, amylopectin, and cellulose, chemically very similar polysaccharides whose characteristic differences lie in the nature of the glycosidic linkage. Finally, we were able to detect and identify phthalate plasticizers, bis(2-ethylhexyl) phthalate (BEHP) and dibutyl phthalate (DBP), present in poly(vinyl chloride)-based food wraps.