Reference : A Multifaceted investigation of the effect of reduced pressure condition on the heads...
Scientific journals : Article
Life sciences : Food science
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/257366
A Multifaceted investigation of the effect of reduced pressure condition on the headspace-solid phase microextraction of extra-virgin olive oil
English
Mascrez, Steven mailto [Université de Liège - ULiège > Département GxABT > Chimie des agro-biosystèmes >]
Psillakis, Elefteria mailto [Technical University of Crete > School of environmental engineering > > >]
Purcaro, Giorgia mailto [Université de Liège - ULiège > Département GxABT > Chimie des agro-biosystèmes >]
2020
Analytica Chimica Acta
1103
106-114
Yes (verified by ORBi)
International
0003-2670
1873-4324
[en] Headspace solid-phase microextraction ; Vacuum-assisted headspace solid-phase ; microextraction ; Extra-virgin olive oil ; Central composite design
[en] Headspace solid-phase microextraction (HS-SPME) is an easy, effective, and selective technique for the
extraction of volatiles and semi-volatiles compounds. For the latter, longer equilibration times are
needed, which are typically shortened by applying agitation or heating the sample. A less explored way
to improve the extraction kinetics of analytes with a low-affinity for the headspace is to sample under
vacuum conditions. The methodology that evolved from this approach was termed “vacuum-assisted HSSPME”
(VaceHSeSPME) and was mainly used for water- and solid-based samples.
The aim of this work was to investigate the effect of vacuum when dealing with non-aqueous liquid
samples. For this purpose, the volatile profile of extra virgin olive oil was analyzed using a divinylbenzene/
carboxen/polydimethylsiloxane fiber followed by gas chromatography-mass spectrometry. The
effects of extraction temperature and sampling time were investigated using traditional one-variable at a
time approach and a two-variable central component design for both VaceHSeSPME and regular HSSPME.
The results showed an important enhancement in the extraction of semi-volatile compounds
when using VaceHSeSPME, and improved the information gained for the olive oil aroma fingerprint. A
theoretical formulation of the underlying process was proposed, providing new insights into the SPME
extraction theory. Lowering the sampling pressure effectively reduced gas-sided limitations and accelerated
extraction kinetics. However, for viscous samples such as olive oils, the liquid-phase resistance
played an important role and delayed extraction. Overall, applying heating (i.e. reducing the viscosity of
the oily sample and increasing headspace concentrations) next to reducing the total pressure in the
headspace is the best analytical HS-SPME strategy for obtaining fast a rich volatile profile from the oily
samples.
European Cooperation in Science and Technology, COST
PortASAP - European network for the promotion of portable, affordable and simple analytical platforms
Researchers ; Professionals
http://hdl.handle.net/2268/257366
10.1016/j.aca.2019.12.053
http://portasap.eu/action.html

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