Gas Chromatography Coupled to Atmospheric Pressure Chemical Ionization FT-ICR Mass Spectrometry for Improvement of Data Reliability.

Gas Chromatography Coupled to Atmospheric Pressure Chemical Ionization FT-ICR Mass Spectrometry for Improvement of Data Reliability.
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气相色谱与大气压化学电离 FT-ICR 质谱联用可提高数据可靠性

DOI:
10.1021/acs.analchem.5b02114
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发表时间:
2015
影响因子:
7.4
通讯作者:
Zimmermann R
Zimmermann R
中科院分区:
化学1区
文献类型:
--
作者:
Schwemer T;Rüger CP;Sklorz M;Zimmermann R

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大气压化学电离(APCI)提供了低碎裂的分子离子信息。将APCI联用到气相色谱(GC)和超高分辨率质谱仪(FT-ICR MS),可以改进复杂混合物的表征。该系统采集的数据量非常大,如果同时考虑气相色谱和超高分辨率质谱学数据,现有的拾峰算法通常非常耗时。因此,开发了能够处理这些数据集的自动例程,并进一步允许识别和去除已知的电离伪影(例如,水和氧加合物、脱甲基、脱氢和脱羧基)。此外,通过预测估计的保留指数来提高数据质量,该估计保留指数是根据精确的海量数据结合双键当量校正简单地计算出来的。该保留指数用于识别不匹配的元素组成。该方法被成功地用于分析重油和柴油中的半挥发性组分,以及船舶柴油机排放的一次燃烧颗粒物。结果,检测到的化合物中有10%-28%被鉴定为无效,并被移除。这些化合物主要是低丰度物种,经典地仅使用质谱学信息进行归属。虽然GC分离受到FT-ICR MS采集速度慢(1赫兹)的限制,但数据库驱动的保留时间比较,通常用于低分辨率GC/MS,可用于揭示异构体信息。
Atmospheric pressure chemical ionization (APCI) offers the advantage of molecular ion information with low fragmentation. Hyphenating APCI to gas chromatography (GC) and ultrahigh resolution mass spectrometry (FT-ICR MS) enables an improved characterization of complex mixtures. Data amounts acquired by this system are very huge, and existing peak picking algorithms are usually extremely time-consuming, if both gas chromatographic and ultrahigh resolution mass spectrometric data are concerned. Therefore, automatic routines are developed that are capable of handling these data sets and further allow the identification and removal of known ionization artifacts (e.g., water- and oxygen-adducts, demethylation, dehydrogenation, and decarboxylation). Furthermore, the data quality is enhanced by the prediction of an estimated retention index, which is calculated simply from exact mass data combined with a double bond equivalent correction. This retention index is used to identify mismatched elemental compositions. The approach was successfully tested for analysis of semivolatile components in heavy fuel oil and diesel fuel as well as primary combustion particles emitted by a ship diesel research engine. As a result, 10–28% of the detected compounds, mainly low abundant species, classically assigned by using only the mass spectrometric information, were identified as not valid and removed. Although GC separation is limited by the slow acquisition rate of the FT-ICR MS (<1 Hz), a database driven retention time comparison, as commonly used for low resolution GC/MS, can be applied for revealing isomeric information.
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