Glossary entry (derived from question below)
French term or phrase:
à front perdu
English translation:
until the solvent front is no longer visible
Added to glossary by
Helen Genevier
May 5, 2008 13:58
16 yrs ago
1 viewer *
French term
France
front perdu
French to English
Science
Chemistry; Chem Sci/Eng
TLC
"Placer la plaque dans une enceinte à chromatographie préalablement saturée par le solvant de migration. Faire migrer le solvant à front perdu."
Proposed translations
(English)
| 3 +3 | see explanation |
Karen Tkaczyk
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| 5 +1 | solvent front |
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Proposed translations
+3
7 mins
Karen Tkaczyk
United States
United States
Native in English
Specializes in field
United States
PhD Chemicals/Pharmaceuticals/Cosmetics
Native in: English (Variants: British, US)
Works in: French to English, English
Related KudoZ points
:
326
Selected
see 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'!)
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'!)
Note from asker:
| Hi Karen, thanks. That's how I interpreted it too, but can only find 1 relevant ref in French and it's not enlightening. |
Peer comment(s):
| agree |
Dr. Johanna Schmitt
: that was my first thought, too, but I can't back it up either, something like "until the front has run out of the plate and is not visible any more"
4 mins
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Thanks
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| agree |
Isabelle Berquin
: I couldn't find a dedicated term either but I agree with this interpretation - perhaps running the TLC longer than usual to resolve closely-migrating species, when Rf determination is not essential? Solvent migration will stop when it reaches the top.
11 hrs
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Thanks
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| agree |
Drmanu49
2 days 6 hrs
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4 KudoZ points awarded for this answer.
Comment: "Thanks Karen and to everyone else for your helpful comments - I used until the solvent front is no longer visible"
+1
6 mins
solvent front
[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 acid chromatography.html - 9k - En cache - Pages similaires - À noter
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 acid chromatography.html - 9k - En cache - Pages similaires - À noter
Peer comment(s):
| neutral |
Karen Tkaczyk
: I think the question is about 'perdu' not 'front'
1 min
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Obviously, but the the 'front' is always 'perdu'...
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| agree |
Trinh Do
: I've come across this term before
39 mins
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Merci Trinh
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Discussion
agree Dr. Johanna Schmitt: that was my first thought, too...
How can you grant an agree when there's no answer given ??!!