Comparison of headspace techniques for sampling volatile natural products in a dynamic system

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Fältnamn	Indikatorer	Metadata
000		03467naa a2200385 4500
001		oai:DiVA.org:kth-19718
003		SwePub
008		100810s2000 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-197182 URI
024	7	a https://doi.org/10.1515/znc-2000-3-4082 DOI
040		a (SwePub)kth
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Faldt, J.4 aut
245	1 0	a Comparison of headspace techniques for sampling volatile natural products in a dynamic system
264		c 2014-06-02
264	1	b Walter de Gruyter GmbH,c 2000
338		a print2 rdacarrier
500		a QC 20100525
520		a Commonly used dynamic sorption techniques for collecting biologically active volatile compounds have been compared. Solid phase microextraction (SPME) using two types of fibers (polydimethylsiloxane, PDMS, 100 mu m, and carbowax/divinylbenzene, CW/DVB, 65 mu m) was compared to purge and trap methods (Porapak Q, Tenax TA and charcoal) and a technique based on absorption in methanol in a cooling bath. Sampling was done in a stream of purified air (20 ml/min) in a closed and temperature-regulated (27 degrees C) glass tube, passing over a capillary tube containing a hexane solution of tridecane, heptadecane, 1-octen-3-ol, 1-hexadecanol, ethyl tetradecanoate, alpha-pinene, linalool, terpinen-4-ol, cis-verbenol, verbenone, beta-caryophyllene, E,E-farnesol, and geranylgeraniol. With all of the methods, the sampling was performed for a period of 30 min before extraction and analysis was done on a GC-FID system. In general, SPME gave a higher response for all compounds except for alpha-pinene, which was only extracted by the CW/DVB fiber. Purge and trap methods and methanol absorption gave the same response for all substances extracted. None of the methods extracted hexadecanol and geranylgeraniol under the conditions used. However, the SPME equipped with the PDMS coating extracted heptadecane, E,E-farnesol and ethyl tetradecanoate. Our results show that SPME, when selecting the fibers to fit the polarity and volatility of the compounds, is an outstanding extraction method compared to purge and trap and methanol absorption, especially for a qualitative analysis. The best conditions for storing fibers exposed to compounds of high volatility were at low temperatures (6 degrees C) in sealed vials, while the worst way was to leave the exposed fiber unprotected at room temperature (22 degrees C). The dynamic sampling system was effectively tested on a fruiting body of a polypore fungus (Ganoderma applanatum) emitting 1-octen-3-ol, and again SPME showed to be the most sensitive technique.
653		a volatile compounds
653		a dynamic headspace
653		a sampling technique
653		a solid-phase microextraction
653		a micro-extraction
700	1	a Eriksson, M.4 aut
700	1	a Valterova, I.4 aut
700	1	a Borg-Karlson, Anna-Karinu KTH,Kemi4 aut0 (Swepub:kth)u1q875ig
710	2	a KTHb Kemi4 org
773	0	t Zeitschrift für Naturforschung C - A Journal of Biosciencesd : Walter de Gruyter GmbHg 55:04-mar, s. 180-188q 55:04-mar<180-188x 0939-5075x 1865-7125
856	4	u https://www.degruyter.com/document/doi/10.1515/znc-2000-3-408/pdf
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-19718
856	4 8	u https://doi.org/10.1515/znc-2000-3-408

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