French: front perduEnglish translation: until the solvent front is no longer visible 
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| GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW) | | French term or phrase: | à front perdu | | English translation: | until the solvent front is no longer visible | | Entered by: | Helen Genevier |
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French to English translations [PRO]
Science - Chemistry; Chem Sci/Eng / TLC | | French term or phrase: front perdu | "Placer la plaque dans une enceinte à chromatographie préalablement saturée par le solvant de migration. Faire migrer le solvant à front perdu."
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| | Clarification request(s) and responseDr Jones: 2:19pm May 5, 2008: Peer comments on this answer (and responses from the answerer)
agree Dr. Johanna Schmitt: that was my first thought, too...
How can you grant an agree when there's no answer given ??!!
Karen Tkaczyk: 2:53pm May 5, 2008: Hello Dr Jones. What do you mean by the 'front' is always 'perdu'? The answer to that may solve Helen's problem. I'm not familiar with a front being 'lost'.
Helen Genevier: 3:04pm May 5, 2008: This doc already uses the expression "front de solvent" as solvant front, and in most of the tests it says to develp until the solvent front has reached a distance of 15 cm, but in one case it is "à front perdu". I even have pictures of the chromatograms and on one the line "front de solvent" is drawn on and on the other it is labelled migration à front perdu at the top. It all points to Karen's answer, i.e. developed until the front has disappeared off the end of the plate.
Helen Genevier: 3:05pm May 5, 2008: ... it'd be good to know if there's a dedicated expression for this
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| | see explanation | Explanation:
Hi Helen,
I've never seen this before. All I can think of is that it means that you leave the plate in until the front runs all the way to the top of the plate, but I don't have anything to back that up with. If no-one else finds a solid answer I'll try to research it later and add a note.
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Note added at 2 hrs (2008-05-05 15:59:45 GMT)
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I can't find a dedicated term Helen, neither in two textbooks I have on the subject nor online.
I've only come across this as being accidental - the point usually being to get the Rf as you know. I have let the solvent run off the top of the plate by accident many times though - we never had a specific came for that in the lab, that I recall (apart from 'idiot'!) |
| Selected response from:
 Karen Tkaczyk
United States
| Note from asker to answererThanks Karen and to everyone else for your helpful comments - I used until the solvent front is no longer visible
4 KudoZ points were awarded for this answer |
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6 mins confidence:  peer agreement (net): +1 |
| solvent front
Explanation:
[PDF] solvent front (in chromatography)Format de fichier: PDF/Adobe Acrobat - Version HTML
solvent front (in chromatography). The front line of the eluent. O.B. 99. IUPAC Compendium of Chemical Terminology. 2nd Edition (1997)
www.iupac.org/goldbook/S05753.pdf - Pages similaires - À noter
paper chromatography- [ Traduire cette page ]An introduction to paper chromatography (including two way ... The left-hand diagram shows the paper after the solvent front has almost reached the top. ...
www.chemguide.co.uk/analysis/chromatography/paper.html - 17k - En cache - Pages similaires - À noter
Chromatography of amino acids- [ Traduire cette page ]Remove the paper from the apparatus, and use a pencil to mark the position of the solvent front. Up to 5 pieces of chromatography paper can be placed across ...
www.biotopics.co.uk/as/amino%20acid%20chromatography.html - 9k - En cache - Pages similaires - À noter
| Dr Jones
France
Specializes in field
Native speaker of:  English
PRO pts in category: 28
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The translation workplace 
peer agreement (net): +3
