Hyphenation of a MEMS based pre-concentrator and GC-IMS

Liedtke, Sascha; Zampolli, S.; Elmi, I.; Masini, Luca; Barboza, Thanie; Dalcanale, Enrico; Pinalli, Roberta; Pähler, Marvin; Drees, Carolin; Vautz, Wolfgang

doi:10.1016/j.talanta.2018.07.057

Cited by 12 publications

(2 citation statements)

References 19 publications

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“…These unique properties of QxCav@SiO2 make it the preconcentrator of choice for benzene sensing in outdoor and indoor air. Furthermore, this miniaturized MEMS preconcentration unit is amenable to be interfaced with other transducers, like metal oxide semiconductors (MOSs) [19] or ion mobility spectrometers (IMSs) [20,21].…”

Section: Discussionmentioning

confidence: 99%

Cavitand Decorated Silica as a Selective Preconcentrator for BTEX Sensing in Air

et al. 2022

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The monitoring of benzene and other carcinogenic aromatic volatile compounds at the ppb level requires boosting both the selectivity and sensitivity of the corresponding sensors. A workable solution is the introduction in the devices of preconcentrator units containing molecular receptors. In particular, quinoxaline cavitands (QxCav) resulted in very efficient preconcentrator materials for the BTEX in air to the point that they have been successfully implemented in a commercial sensor. In this work, we report a highly efficient quinoxaline-based preconcentrator material, in which the intrinsic adsorption capacity of the QxCav has been maximized. The new material consists of silica particles covalently coated with a suitable functionalized QxCav derivative (QxCav@SiO2). In this way, all the cavities are exposed to the analyte flux, boosting the performance of the resulting preconcentration cartridge well above that of the pure QxCav. It is noteworthy that the preconcentrator adsorption capacity is independent of the relative humidity of the incoming air.

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Section: Discussionmentioning

confidence: 99%

Cavitand Decorated Silica as a Selective Preconcentrator for BTEX Sensing in Air

et al. 2022

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“…The measurements were performed using a mobile ppq‐tec GC–IMS (ION‐GAS, Dortmund, Germany) based on hardware provided by STEP (Pockau‐Lengefeld, Germany). For increased sensitivity, the commonly used sample loop (1 mL) was substituted with a micro‐electro‐mechanical systems–based in‐line pre‐concentration chip filled with Carbograph 4 as the adsorbent (CNR‐IMM, Bologna, Italy) (for detailed description, see Liedtke et al, 2019 ). For the GC pre‐separation, we used a MXT‐200 capillary column (30 m × 0.53 mm, 1.5 µm coating; Restek, Centre County, Pennsylvania, USA), which is operated isothermally at 80°C, with a carrier gas flow (filtered air from the internal gas circuit) of 21 mL min −1 .…”

Section: Methodsmentioning

confidence: 99%

Evaluation of floral volatile patterns in the genus Narcissus using gas chromatography–coupled ion mobility spectrometry

et al. 2023

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Premise Daffodils (Narcissus, Amaryllidaceae) are iconic ornamentals with a complex floral biology and many fragrant species; however, little is known about floral plant volatile organic compounds (pVOCs) across the genus and additional sampling is desirable. The present study investigates whether the floral scent of 20 species of Narcissus can be characterized using gas chromatography–coupled ion mobility spectrometry (GC–IMS), with the aim of building a comparative pVOC data set for ecological and evolutionary studies. Methods We used a commercial GC–IMS equipped with an integrated in‐line enrichment system for a fast, sensitive, and automated pVOC analysis. This facilitates qualitative and (semi)‐quantitative measurements without sample preparation. Results The GC–IMS provided detailed data on floral pVOCs in Narcissus with very short sampling times and without floral enclosure. A wide range of compounds was recorded and partially identified. The retrieved pVOC patterns showed a good agreement with published data, and five “chemotypes” were characterized as characteristic combinations of floral volatiles. Discussion The GC–IMS setup can be applied to rapidly generate large amounts of pVOC data with high sensitivity and selectivity. The preliminary data on Narcissus obtained here indicate both considerable pVOC variability and a good correspondence of the pVOC patterns with infrageneric classification, supporting the hypothesis that floral scent could represent a considerable phylogenetic signal.

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Diurnal patterns of floral volatile emissions in three species of Narcissus

Losch,

Weigend

2024

American J of Botany

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PremisePlants generate a wide array of signals such as olfactory cues to attract and manipulate the response of pollinators. The present study addresses the temporal patterns of scent emission as an additional dimension to the scent composition. The expectation is that divergent floral function is reflected in divergent qualitative and temporal emission patterns.MethodsWe used GC‐ion mobility spectrometry with an integrated pre‐concentration for automated acquisition of the temporal trends in floral volatile emissions for N. viridiflorus, N. papyraceus, and N. cantabricus subsp. foliosus.ResultsWe found a considerable increase in scent emissions and changes in scent composition for N. viridiflorus at night. This increase was particularly pronounced for aromatic substances such as benzyl acetate and p‐cresol. We found no diurnal patterns in N. papyraceus, despite a similar qualitative composition of floral volatiles. Narcissus cantabricus subsp. foliosus showed no diurnal patterns either and differed considerably in floral scent composition.ConclusionsScent composition, circadian emission patterns, and floral morphology indicate divergent, but partially overlapping pollinator communities. However, the limited pollinator data from the field only permits a tentative correlation between emission patterns and flower visitors. Narcissus papyraceus and N. cantabricus show no clear diurnal patterns and thus no adjustment to the activity patterns of their diurnal pollinators. In N. viridiflorus, timing of scent emission indicates an adaptation to nocturnal flower visitors, contradicting Macroglossum as the only reported pollinator. We propose that the legitimate pollinators of N. viridiflorus are nocturnal and are still unidentified.

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Hyphenation of a MEMS based pre-concentrator and GC-IMS

Cited by 12 publications

References 19 publications

Cavitand Decorated Silica as a Selective Preconcentrator for BTEX Sensing in Air

Cavitand Decorated Silica as a Selective Preconcentrator for BTEX Sensing in Air

Evaluation of floral volatile patterns in the genus Narcissus using gas chromatography–coupled ion mobility spectrometry

Diurnal patterns of floral volatile emissions in three species of Narcissus

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