Title page for ETD etd-04252005-163418

Document Type Master's Dissertation
Author Zellelow, Amanuel Zeru
URN etd-04252005-163418
Document Title The Analysis of some South African essential oils by comprehensive two-dimentional gas chromatography (GCxGC)
Degree MSc
Department Chemistry
Advisor Name Title
Prof E R Rohwer Committee Chair
  • Essences and essential oils South Africa
  • Essences and essential oils analysis
  • Gas chromatography
  • Essences and essential oils quality
Date 2004-04-20
Availability unrestricted
By virtue of their fragrance and therapeutic nature, essential oils have gained great application in the cosmetic and pharmaceutical industries. These oils, as products consumed by the public for the general health and cosmetics, should be of high quality and unadulterated.

In this project comprehensive two-dimensional gas chromatography (GCxGC) was used for the qualitative analysis of some South African essential oils. The main purpose of the project was to evaluate GCxGC for identification of essential oil constituents and for fingerprinting the different essential oils for quality control purposes. Essential oils of the same kind but of different origin were compared and the quantitative variation between their components was studied.

Gas chromatography-time-of flight mass spectrometry (GC-TOFMS) as well as comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (GCxGC-TOFMS) was used to help identify component peaks separated in the GCxGC instrument.

Once certain precautions are taken and the delicate modulator is correctly optimized, the GCxGC results are reproducible and easy to interpret. Overall, the GCxGC technique utilized showed good promise for quality control of essential oils.

  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  00front.pdf 2.11 Mb 00:09:45 00:05:00 00:04:23 00:02:11 00:00:11
  01chapters1-2.pdf 2.26 Mb 00:10:26 00:05:22 00:04:41 00:02:20 00:00:12
  02chapter3.pdf 2.23 Mb 00:10:18 00:05:18 00:04:38 00:02:19 00:00:11
  03chapter4.pdf 3.86 Mb 00:17:53 00:09:11 00:08:02 00:04:01 00:00:20
  04chapter5.pdf 2.86 Mb 00:13:13 00:06:48 00:05:57 00:02:58 00:00:15
  05appendices.pdf 4.81 Mb 00:22:16 00:11:27 00:10:01 00:05:00 00:00:25

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