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acetonitrile-20 to 5% water ramping @ 0.5% per min.

English translation: explanation

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11:11 Feb 16, 2005
English to English translations [PRO]
Science - Chemistry; Chem Sci/Eng
English term or phrase: acetonitrile-20 to 5% water ramping @ 0.5% per min.
The crude product is purified by HPLC in two runs eluting with a gradient of acetonitrile-20 to 5% water ramping @ 0.5% per min. Product containing fractions from both runs are combined and concentrated to afford

I feel here gradient already expresses the meaning of "20 to 5% water". What does "ramping"and "@"mean here?

Thank you very, very much in advnace!
Jianming Sun
Local time: 05:43
English translation:explanation
Explanation:
ramp means "to increase or decrease at a constant rate"


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Note added at 15 mins (2005-02-16 11:26:54 GMT)
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Maybe @ represent \"at \" . I\'m not sure.
Selected response from:

XiaoRan
Local time: 05:43
Grading comment
Thanks!
4 KudoZ points were awarded for this answer

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Summary of answers provided
4 +4explanation
XiaoRan


Discussion entries: 2





  

Answers


10 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +4
explanation


Explanation:
ramp means "to increase or decrease at a constant rate"


--------------------------------------------------
Note added at 15 mins (2005-02-16 11:26:54 GMT)
--------------------------------------------------

Maybe @ represent \"at \" . I\'m not sure.

XiaoRan
Local time: 05:43
Specializes in field
Native speaker of: Native in ChineseChinese
PRO pts in category: 16
Grading comment
Thanks!

Peer comments on this answer (and responses from the answerer)
agree  Klaus Herrmann: of 0.5 percent per minute
4 mins
  -> thanks.

agree  Jörgen Slet: @ is "at" indeed
59 mins
  -> thanks.

agree  Mehmet Şahin
6 hrs
  -> thanks.

agree  Clauwolf: at, sure
8 hrs
  -> thank you
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