ScienceDirect® Home Skip Main Navigation Links
You have guest access to ScienceDirect. Find out more.
 
Home
Browse
My Settings
Alerts
Help
 Quick Search
 Search tips (Opens new window)
    Clear all fields    
advertisementadvertisement
Journal of Chromatography A
Volume 1150, Issues 1-2, 25 May 2007, Pages 131-135
29th International Symposium on Capillary Chromatography
 
Font Size: Decrease Font Size  Increase Font Size
 Abstract - selected
Article
Purchase PDF (162 K)

  E-mail Article   
  Add to my Quick Links   
Bookmark and share in 2collab (opens in new window)
Request permission to reuse this article
  Cited By in Scopus (0)
 
 
 
Related Articles in ScienceDirect
View More Related Articles
 
Special issue
View Record in Scopus
 
doi:10.1016/j.chroma.2007.02.031    How to Cite or Link Using DOI (Opens New Window)
Copyright © 2007 Elsevier B.V. All rights reserved.

Determination of the threshold odor concentration of main odorants in essential oils using gas chromatography–olfactometry incremental dilution technique

Maurizio Benzoa, Corresponding Author Contact Information, E-mail The Corresponding Author, Gianluca Gilardonia, Carlo Gandinib, Gabriele Caccialanzab, Paola Vita Finzic, Giovanni Vidaric, Susana Abdod and Patricia Layedrad

aOSMOTECH s.r.l., Dipartimento di Chimica Farmaceutica, Via Taramelli 12, 27100 Pavia, Italy bUniversità degli Studi di Pavia, Dipartimento di Chimica Farmaceutica e Centro di Etnobiofarmacia, Via Taramelli 12, 27100 Pavia, Italy cUniversità degli Studi di Pavia, Dipartimento di Chimica Organica e Centro di Etnobiofarmacia, Via Taramelli 10, 27100 Pavia, Italy dEscuela Superior Politécnica de Chimborazo, Facultad de Ciencias Quimicas, Riobamba, Ecuador

Available online 15 February 2007.

Purchase the full-text article



References and further reading may be available for this article. To view references and further reading you must purchase this article.

Abstract

An essential oil, obtained by steam distillation of Clinopodium tomentosum (Kunth) Govaerts (Lamiaceae), collected in Ecuador, was analyzed by gas chromatography–olfactometry (GC–O) and GC–MS techniques. To our knowledge, the composition of this essential oil is described here for the first time, both from the chemical and olfactometric viewpoints. A preliminary analysis by GC–MS and using Kovats’ retention indexes, lead to characterize and quantify the oil constituents, while GC–O was then applied for the identification of the main odorants. By the incremental dilution method (AEDA, CHARM Analysis), applied to the GC–O technique, the flavor dilution (FD) chromatogram was obtained. In order to calculate the TOC values of the main odorants, the relationship between the odorant concentration at the sniffing port and that one in the injected solution was established. This relationship was calculated by comparing the injected amount with the TOC value of a reference compound (limonene), obtained by dynamic dilution olfactometry. A good agreement was found between calculated and measured TOC values of few odorants.

Keywords: GC–O; TOC; Essential oil; Clinopodium tomentosum (Kunth) Govaerts; Dynamic olfactometry; AEDA; GC–MS

Article Outline

1. Introduction
2. Experimental
2.1. Instruments
2.2. Solvents and standards
2.3. Preparation of the essential oil of C. tomentosum (Kunth) Govaerts
2.4. GC–MS analysis
2.5. Dynamic dilution olfactometry
2.6. GC–O analysis by incremental dilution technique (AEDA)
3. Results and discussion
3.1. Phytochemistry
3.2. Retention indexes calculation
3.3. GC–O analysis
3.4. TOC measurement
4. Conclusions
Acknowledgements
References


Journal of Chromatography A
Volume 1150, Issues 1-2, 25 May 2007, Pages 131-135
29th International Symposium on Capillary Chromatography
 
Home
Browse
My Settings
Alerts
Help
Elsevier.com (Opens new window)
About ScienceDirect  |  Contact Us  |  Information for Advertisers  |  Terms & Conditions  |  Privacy Policy
Copyright © 2008 Elsevier B.V. All rights reserved. ScienceDirect® is a registered trademark of Elsevier B.V.