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GC Analysis – Part VIII. Calibrated Compound Quantification

17 September 2015

Alexis St-Gelais, M. Sc., chimiste – Popularization Although it constitutes a large part of our activities at PhytoChemia, essential oils analyses are in fact a special case for chemists. Indeed, it is one of the only cases (along with hydrosols, fatty acids methyl esters and a handful of other applications) where the approximation “concentration ≈ %

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GC Analysis – Part VII. Hydrosol Analysis

15 March 2015

Alexis St-Gelais, M. Sc., chimiste – Popularization We have previously seen a worked example of essential oil analysis. Hydrosols can be analysed in about just the same way as essential oils. Yet, there is one huge difference between a pure essential oil and an hydrosol: the latter is always a solution. This implies some specific

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GC Analysis – Part VI. Applied Example of Analysis with Retention Indices

8 September 2014

Alexis St-Gelais – Popularization I wrote some time ago about retention indices in GC-FID and the advantages of using two columns to analyze an essential oil. Since this is a central aspect of the work we do using GC, I wished to detail a real-case analysis, allowing you to understand more clearly our methodology. Throughout

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GC Analysis – Part V. FID or MS for Essential Oils?

2 September 2014

Alexis St-Gelais – Popularization [Minor addenda to the original text were made on March 23, 2019, and are noted in green] An important task of analytical chemistry is to select the detector that best suits the purpose of an analysis. Each detector has indeed its pros and cons. In the area of essential oils, FID and

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GC Analysis – Part IV. Retention Indices

25 August 2014

Alexis St-Gelais – Popularization I mentioned in the first post of this series on GC analyzes that PhytoChemia resorted simultaneously to two capillary columns to analyze essential oils, one polar (Solgel-Wax) and one non-polar (DB-5). The rationale behind this technique will reveal some of the art of interpreting essential oils profiles.  We have seen that

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