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GC-MS analysis and comparison of volatile compounds of Salvia aucheri Boiss. var. mesatlantica Maire., obtained by hydrodistillation and headspace solid phase microextraction (HS-SPME)

Znini M., Majidi L., Desjobert J. M., Paolini J., Costa J.

Acta Chromatographica

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2014

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Vol. 26, no. 3

495--505

EN

The essential oil and the volatile compounds of Salvia aucheri Boiss. var. mesatlantica Maire were analyzed by gas chromatography (GC) and GC-mass spectrometry (GC-MS). The volatile compounds were detected using headspace-solid phase microextraction (HS-SPME) under optimized parameters. A comparative qualitative and quantitative study on the composition of the oils was carried out. For this, 38 compounds, constituting 95.40% of the oil, were identified in the essential oil by hydrodistillation (HD), and 32 compounds, representing 93% of the oil, were characterized by HS-SPME. The major components identified are camphor (49.80%, 51.80%), 1,8-cineole (9.50%, 9.40%), viridiflorol (8.80%, 1.40%), camphene (7.80%, 10.60%), α-pinene (2.90%, 4.50%), and p-cymene (1.50%, 2.40%) of essential oil and volatile compounds detected in HS-SPME, respectively. Quantitative but not qualitative differences have been found in the chemical composition of both analyzed samples depending on the extraction method. For these reasons, HS-SPME can be considered as an alternative technique for isolating volatiles from aromatic plants.

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Analysis of essential oil compositions of Lavandula angustifolia by HS-SPME and MAHS-SPME followed by GC and GC-MS

Torabbeigi M., Aberoomand-Azar P.

Acta Chromatographica

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2013

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Vol. 25, no. 3

571--579

EN

Head space solid phase microextraction (HS-SPME) and microwave-assisted HS-SPME (with polydimetyhylsiloxane [PDMS] fiber) were used for isolation of the volatile contents of Lavandula angustifolia. HS-SPME was done at 70°C for 5 min and microwave-assisted HS-SPME (MA-HS-SPME) was performed in 500 W of microwave power for 5 min. The results of the GC and GC-MS analysis showed that low levels of volatile compounds, which were not found by hydrodistillation, were obtained by SPME methods. The major extracted compounds were the same as hydrodistillation, including 1,8-cineole (41.37% and 54.84%), camphor (15.83% and 23.25%), and borneol (12.32% and 5%) extracted by HS-SPME and MA-HS-SPME, respectively.

3

HS-SPME-GC-MS analysis of organic compounds emitted from poly(methyl methacrylate)

Rogalewicz R., Voelkel A.

Chemia Analityczna

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2005

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Vol. 50, No. 6

991-1006

EN

Volatile organic compounds generated during thermal decomposition of poly (methyl meth-aery late) (PMMA) were analysed by capillary gas chromatography with mass spectrometry detection (GC-MS). Decomposition process of PMMA was carried out for 10 min in the closed cell at 100, 150,200,250, and 280°C. Volatile compounds emitted from poly(methyl methacrylate) were trapped onto the SPME (solid phase microextraction) polymeric fibre and further analysed by GC. Qualitative analysis has shown that the emitted vapours are the complex mixture of decomposition products of poly (methyl methacrylate), e.g. methyl methacrylate and several polymer-accompanying compounds as the initiator (2,2'-azobis-(2-methylpropionitrile) - AIBN). chain regulator (dodecanethiol), inhibitor (Topanol OC), and plasticizers (phthalates). Our studies covered identification of the compounds evolved during decomposition of poly(methyl methacrylate) into the headspace phase, optimisation of HS-SPME conditions, e.g. fibre coating, desorption time and temperature, as well as of the conditions of PMMA decomposition, e.g. decomposition time and temperature, or the sample mass. We accomplished also quantitative analysis of main products of PMMA decomposition and of the accompanying compounds present in the studied material.

PL

Lotne związki organiczne powstałe w trakcie rozkładu termicznego poli (metakrylanu metylu) (PMMA) analizowano techniką kapilarnej chromatografii gazowej sprzężonej ze spektrometrią mas (GC-MS). Termiczny rozkład PMMA przeprowadzono w zamkniętym naczyniu przy 100,150, 200,250 i 280°C przez l0 minut. Lotne związki uwalniane z poli (metakrylanu metylu) były zatrzymywane na polimerowym włóknie SPME (mikroekstrakcja do fazy staiej) i dalej analizowane techniką GC. Analiza jakościowa pokazała, że emitowane pary sązfożonąmieszaninąproduktów rozkładu poli (metakrylanu metylu), wśród których zidentyfikowano np.: metakrylan metylu i kilka dodatków stosowanych przy polimeryzacji włącznie 2 inicjatorem (azodiizobulyronitrylem -AiBN). regulatorem długości iańcucha (dodekanotiolem). inhibitorem (Topanolem OC) i plastyfikatorami (ftalanami). W naszych badaniach zidentyfikowaliśmy związki uwalniane podczas rozkładu poli (metakrylanu metylu) w fazie nadpowierzchniowej oraz optymalizowaliśmy warunki HS-PME. jak np.; rodzaj pokrycia włókna, czas i temperaturę desorpcji, oraz warunki termicznego rozkładu PMMA, jak np.: czas i temperatura i masa próbki. Nasze badania miały umożliwić przeprowadzenie analizy ilościowej głównych produktów rozkładu PMMA i obecnych w badanym materiale dodatków.