Adulteration or natural variability? enantioselective gas chromatography in purity control of essential oils

König, Wilfried Α.; Fricke, Christiane; Saritas, Yücel; Momeni, Behdad; Hohenfeld, Gerhard

doi:10.1002/jhrc.1240200202

Cited by 54 publications

(27 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Specifically, these enantiomers were (-)-menthone, (-)-neomenthol, (-)-menthol, and (+)-isomenthol. This is in agreement with data previously found for a number of samples in our laboratory by employing solid phase microextraction (SPME) [19] as well as by other authors using different analytical techniques [20][21][22]. Although the peak areas obtained (Table 1) were similar when applying any of the set of values of the tested parameters, 208C and 3 min were finally selected as the PTV temperature and the purge time, respectively, since they provided acceptable areas also showing high effectiveness in solvent elimination.…”

Section: Resultssupporting

confidence: 93%

Use of a superabsorbent polymer for the pre‐concentration of volatile components from complex matrices

Flores

Herráiz

Castillo³

2006

J of Separation Science

View full text Add to dashboard Cite

A polymeric material commonly used as a superabsorbent in the sanitary industry is proposed for the first time for analytical purposes. Specifically, we have evaluated in this work the possibility of using this material in a programmed-temperature vaporizer (PTV) injector for the introduction of large volume samples. To that end, the viability of this superabsorbent polymer as a retaining material was first studied by testing the stability of its absorption capacity in the presence of various solvents and at various temperatures. Subsequently, its effectiveness in the isolation of menthol and its isomers from Mentha piperita essential oil as well as gamma-lactones from peach essential oil was assessed. For that purpose, optimization of different variables, namely PTV temperatures during sampling, purge times, and desorption temperatures, involved in the solvent elimination was performed. Additionally, the information obtained was compared with that acquired for the adsorbent material Tenax TA. The results shown in this work proved not only the viability of using this superabsorbent polymer in analytical procedures but also demonstrated its advantages over the adsorbent Tenax TA in attaining internal GC concentration of a sample by introducing large volumes via PTV.

show abstract

Section: Resultssupporting

confidence: 93%

Use of a superabsorbent polymer for the pre‐concentration of volatile components from complex matrices

Flores

Herráiz

Castillo³

2006

J of Separation Science

View full text Add to dashboard Cite

show abstract

“…Although a number of articles on the enantiomeric composition of some menthol isomers have previously been published by other authors [13][14][15], in most cases the reported studies refer to essential oils from Mentha species instead of to the plant material. Moreover, multidimensional chromatographic techniques have been so far mainly applied [15], thus demanding a careful and sometimes complex optimisation to be done before the analysis can be performed.…”

Section: Introductionmentioning

confidence: 93%

Natural variability of the enantiomeric composition of bioactive chiral terpenes in Mentha piperita

Castillo

Blanch

Herráiz

2004

Journal of Chromatography A

View full text Add to dashboard Cite

The variability of the enantiomeric distribution of biologically active chiral terpenes in Mentha piperita plants from different geographical origins was evaluated by solid phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS). The optimisation of some parameters (i.e. exposure temperature, extraction time and type of fibre) affecting SPME-extraction enabled relative standard deviations ranging from 4 to 13% to be achieved. The use of two different chiral stationary phases allowed to separate the identified chiral terpenes into their corresponding enantiomers as well as to verify the enantiomeric excesses of those compounds which were enantiomerically resolved on both phases. For all chiral terpenes, the enantiomeric composition varied within a very narrow range all over the samples. Consequently, it may be stated that the enantiomeric composition of chiral terpenes in Mentha piperita appears to be independent of the geographical origin of the plant and, thus, any alteration in the characteristic value may be related to an adulteration or inadequate sample handling. These results support the usefulness of the enantiomeric composition of bioactive chiral terpenes in Mentha piperita in authenticity studies.

show abstract

“…In all cases, the MS was set for a full scan from 40 to 300 mass units at an interval of 0.5s and a scan speed of 500amu s -1 . Linalool chirality (König et al, 1997) was determined on a Shimadzu GC-17A equipped with a flame ionization detector, using a 25m, 0.25mm inner diameter Lipodex-E column (Macherey-Nagel, Düren, Germany) with an isocratic oven temperature of 55°C and a flow rate of 2mlmin -1 .…”

Section: Volatile Sampling and Gcms Analysismentioning

confidence: 99%

Increased plant volatile production affects oviposition, but not larval development, in the moth Helicoverpa armigera

McCallum

Cunningham

Lücker

et al. 2011

Journal of Experimental Biology

View full text Add to dashboard Cite

SUMMARYIt is well established that herbivorous insects respond to changes in plant odour production, but little attention has been given to whether these responses relate to direct fitness costs of plant volatile production on insect growth and survival. Here, we use transgenic Nicotiana tabacum (tobacco) plants that produce relatively large amounts of the volatile (S)-linalool to study whether the responses of egg-laying herbivorous insects to linalool production relate directly to the growth and survival of offspring. In choice tests, fewer eggs were laid on transgenic plants compared with non-transformed controls, indicating that increased linalool emissions have a deterrent effect on Helicoverpa armigera oviposition. Larval survival and larval mass after feeding on transgenic leaves, however, was comparable to non-transformed controls. (S)-linalool, whether in volatile or sequestered form, does not appear to have a direct effect on offspring fitness in this moth. We discuss how the ecology of this polyphagous moth species may necessitate a high tolerance for certain volatiles and their related non-volatile compounds, and suggest that responses by adult female H. armigera moths towards increased linalool production may be context specific and relate to other indirect effects on fitness.Supplementary material available online at

show abstract

Adulteration or natural variability? enantioselective gas chromatography in purity control of essential oils

Cited by 54 publications

References 18 publications

Use of a superabsorbent polymer for the pre‐concentration of volatile components from complex matrices

Use of a superabsorbent polymer for the pre‐concentration of volatile components from complex matrices

Natural variability of the enantiomeric composition of bioactive chiral terpenes in Mentha piperita

Increased plant volatile production affects oviposition, but not larval development, in the moth Helicoverpa armigera

Contact Info

Product

Resources

About