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PhytoChemia Acta

Month: August 2014

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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GC Analysis – Part III. Mass Spectrometry Detection (MS)

18 August 2014

Alexis St-Gelais – Popularization My last post gave some details about a detection method commonly used in GC, the FID. Another detector that is widely used for the analysis of volatile compounds, including at PhytoChemia, is the mass spectrometer (MS). Unlike the FID, the MS is a complex detector. Typically, in GC-MS (although other modes […]

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GC Analysis – Part II. The Flame Ionization Detector (FID)

11 August 2014

Alexis St-Gelais – Popularization The first part of this series dealt with the principles of separation of volatile molecules upon analysis by GC. After their separation, the analyst has yet to be able to detect molecules as they leave the capillary column, either to identify or quantify them. At PhytoChemia, we mainly use two types […]

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Extracting Essential Oils in the Lab

4 August 2014

Alexis St-Gelais – Popularization Many of the samples we analyze are sent to us directly as essential oils. Sometimes, however, a customer wishes to compare plants before their extraction. He may also need a measure of oil yield so that he can plan ahead larger extractions. In these cases, we use two main extraction techniques, each with […]

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