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2000 (2)
1Author    Jenny Fäldt3, Mikael Erikssonb, Irena Valterovác, Anna-Karin Borg-Karlson3, Czech Republic, FlemingovoNarnRequires cookie*
 Title    Comparison of Headspace Techniques for Sampling Volatile Natural Products in a Dynamic System c Institute o f Organic Chemistry and Biochemistry, Academy of Sciences of the  
 Abstract    Commonly used dynamic sorption techniques for collecting biologically active volatile compounds have been compared. Solid phase microextraction (SPM E) using two types of fibers (polydimethylsiloxane, PDMS, 100 j.im, and carbowax/divinylbenzene, CW /DVB, 65 fj.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 °C) glass tube, passing over a capillary tube containing a hexane solution of tridecane, heptadecane, l-octen-3-ol, 1-hexadecanol, ethyl tetradecanoate, a-pinene, linalool, terpinen-4-ol, ds-verbenol, verbenone, ß-caryophyllene, Z^E-farnesol, and geranylgeraniol. With all of the methods, the sampling was performed for a period o f 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 a-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 ex­ tracted hexadecanol and geranylgeraniol under the conditions used. However, the SPME equipped with the PDM S coating extracted heptadecane, i^Zs-farnesol and ethyl tetradeca­ noate. 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 °C) in sealed vials, while the worst way was to leave the exposed fiber unprotected at room temperature (22 °C). The dynamic sampling system was effectively tested on a fruiting body of a polypore fungus (G anoderm a applanatum) emitting l-octen-3-ol, and again SPME showed to be the most sensitive technique. 
  Reference    Z. Naturforsch. 55c, 180—188 (2000); 16610 Prague 6 Czech Republic received November 25 1999/February 10 2000 
  Published    2000 
  Keywords    Volatile Compounds, Dynamic Headspace, Sampling Technique 
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 TEI-XML for    default:Reihe_C/55/ZNC-2000-55c-0180.pdf 
 Identifier    ZNC-2000-55c-0180 
 Volume    55 
2Author    ZornitzaG. Kamenarska3, StefkaD. Dimitrova-Konaklievab, Christina Nikolovac, AthanasIi Kujumgievd, KamenL. Stefanov3, SimeonS. Popov3Requires cookie*
 Title    Volatile Components of the Freshwater Algae Spirogyra and Mougeotia  
 Abstract    Several species of freshwater green algae belonging to the order Zygnematales (Spirogyra crassa (K tz.) Czurda, S. longata (Vauch.) Ktz., and Mougeotia viridis (K tz.) W ittr.) were found to have a specific composition of the volatile fraction, which confirms an earlier pro­ posal for the existence of two groups in the genus Spirogyra. Antibacterial activity was found in volatiles from S. longata. 
  Reference    Z. Naturforsch. 55c, 495—4 (2000); received February 4/M arch 13 2000 
  Published    2000 
  Keywords    Antibacterial Activity, Mougeotia, Spirogyra, Volatile Compounds 
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 TEI-XML for    default:Reihe_C/55/ZNC-2000-55c-0495.pdf 
 Identifier    ZNC-2000-55c-0495 
 Volume    55