Solid phase microextraction (SPME)-transmission mode (TM) pushes down detection limits in direct analysis in real time (DART). Gomez-Rios, G. A. & Pawliszyn, J. Chemical Communications, 2014.
Solid phase microextraction (SPME)-transmission mode (TM) pushes down detection limits in direct analysis in real time (DART) [link]Paper  doi  abstract   bibtex   
A new SPME device was developed and applied for quick solventless extraction/enrichment of small molecules from complex matrices. Subsequently, the device was coupled as a transmission mode substrate to DART resulting in limits of detection in the low pg/mL level in less than 3 minutes with reproducibility below 5% RSD.
@article{gomez-rios_solid_2014,
	title = {Solid phase microextraction ({SPME})-transmission mode ({TM}) pushes down detection limits in direct analysis in real time ({DART})},
	issn = {1359-7345},
	url = {http://dx.doi.org/10.1039/C4CC05301J},
	doi = {10.1039/C4CC05301J},
	abstract = {A new SPME device was developed and applied for quick solventless extraction/enrichment of small molecules from complex matrices. Subsequently, the device was coupled as a transmission mode substrate to DART resulting in limits of detection in the low pg/mL level in less than 3 minutes with reproducibility below 5\% RSD.},
	journal = {Chemical Communications},
	author = {Gomez-Rios, German Augusto and Pawliszyn, Janusz},
	year = {2014},
}

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