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首页> 外文期刊>Atmospheric environment >Analysis of enantiomeric and non-enantiomeric monoterpenes in plant emissions using portable dynamic air sampling/solid-phase microextraction (PDAS-SPME) and chiral gas chromatography/mass spectrometry
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Analysis of enantiomeric and non-enantiomeric monoterpenes in plant emissions using portable dynamic air sampling/solid-phase microextraction (PDAS-SPME) and chiral gas chromatography/mass spectrometry

机译：使用便携式动态空气采样/固相微萃取（PDAS-SPME）和手性气相色谱/质谱法分析植物排放物中的对映体和非对映体单萜

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摘要

A portable dynamic air sampler (PDAS) using a porous polymer solid-phase microextraction (SPME) fibre has been validated for the determination of biogenic enantiomeric and non-enantiomeric monoterpenes in air. These compounds were adsorbed in the field, and then thermally desorbed at 250℃ in a gas chromatograph injector port connected via a β-cyclodextrin capillary separating column to a mass spectrometer. The optimized method has been applied for investigating the emissions of enantiomeric monoterpenes from Pseudotsuga menziesii (Douglas-fir), Rosmarinus officinalis (Rosemary) and Lavandula lanata (Lavender) which were selected as representative of coniferous trees and aromatic plants, respectively. The enantiomers of α-pinene, sabinene, camphene, δ-3-carene, β-pinene, limonene, β-phellandrene, 4-carene and camphor were successfully determined in the emissions from the three plants. While Douglas-fir showed a strong predominance toward (-)-enantiomers, Rosemary and Lavender demonstrated a large variation in enantiomeric distribution of monoterpenes. The simplicity, rapidity and sensitivity of dynamic sampling with porous polymer coated SPME fibres coupled to chiral capillary gas chromatography/mass spectrometry (GC/MS) makes this method potentially useful for in-field investigations of atmosphere-biosphere interactions and studies of optically explicit atmospheric chemistry.
机译：已经验证了使用多孔聚合物固相微萃取（SPME）纤维的便携式动态空气采样器（PDAS）用于测定空气中的生物对映体和非对映体单萜。这些化合物在现场被吸附，然后在气相色谱进样器端口中于250℃进行热脱附，该端口通过β-环糊精毛细管分离柱与质谱仪连接。该优化方法已用于调查分别来自针叶树和芳香植物的假单胞菌（Douglas-fir），迷迭香（Rosemarinus officinalis（Rosemary）和熏衣草（Lavender lanata）（薰衣草））对映体单萜的排放。在这三种植物的排放物中，成功确定了α-pine烯，sa烯，camp烯，δ-3-烯，β-pine烯，li烯，β-ph烯，4-烯和樟脑的对映体。道格拉斯冷杉对（-）-对映异构体表现出较强的优势，而迷迭香和薰衣草在单萜的对映异构体分布中表现出很大的差异。使用多孔聚合物涂覆的SPME纤维与手性毛细管气相色谱/质谱（GC / MS）耦合进行动态采样的简单，快速和灵敏性，使得该方法对于大气-生物圈相互作用的现场研究以及光学显性大气的研究具有潜在的实用性化学。

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