extract a chromatogram from ezchrom elite

[leaner]

I have few sample which I measured between the 0.19 to 100 minutes. I tried to extract the sample like this

"Method" ----- > "advanced" -----> "data Export"

I click on "export enable"

then I selected "chromatogram" and then "export these parameters" which gives me CDF or ASCII . So far so good. however, when I open the file and I check for example for a channel lets say 200, I managed to get the data out. There are two problems with it

1- the peak shapes is different from what the software shows, it is because the software integral the values ? how can I avoid it ?

2- the retention time for sample 1 is different than sample 2, how can I have all these together ? I want to have the correct chromatograms for all my samples. is there any person who can help ?

[HPLCaddict]

I'm not really sure what you're trying to do. Which program are you using for opening the extracted data? Excel? Or something else?
An ASCII export gives you the raw data, nothing else, so the integration in EzChrom cannot change the data.
Concerning 1: different peak shapes are not possible because, see above, you have exactly the raw data in the exported file. Maybe it just looks different because of different scaling?
Concerning 2: I don't get what you're trying to do. Combining different runs? If you see different retention times for several runs, it's usually not the fault of the CDS

[leaner]

Hello,


Lets say I have one sample and I measured it 2 times. So I will have two raw data. The range I want is from 0 min to 30 min. but when I open the file, (no matter where, I am a R, Matlab skilled) even using a xls , you can find the information for all channels.

When I say peak shapes is different in raw data than what the software shows (my software version is ezchrom elite 3.3.2). let me explain, I open the data in xls and I plot it, it is different from what the ezchrom shows. It is because it gets Integral from data? why should the raw data be different than what it is shown in the ezchrom ?

when I say retention times are different from sample to sample, I meant , Lets say I have two samples (sample1 measured from 0 minutes to 30 minutes) the same for the sample 2, but when I get the raw data, I don't have these range for both samples. lets say in a specific channel I have 20 data point for sample 1 and I have 30 data point for sample 2

I hope my explanation is clear enough but if still not , please let me know
I try to answer your questions as below

I'm not really sure what you're trying to do. Which program are you using for opening the extracted data? Excel? Or something else?

I used xls, R, Matlab and Python, all are giving me the same results

An ASCII export gives you the raw data, nothing else, so the integration in EzChrom cannot change the data.
I doubt it, I don't know why but I checked few channel from the raw data compared to what EzChrom shows and I found the range of data, the high of the peak, the shape , all are different

Concerning 1: different peak shapes are not possible because, see above, you have exactly the raw data in the exported file. Maybe it just looks different because of different scaling?

I did not do any scaling, my peaks are sharp while the chromatograms are smooth when Ezchrom shows. it is because when I get the raw data, it only extract few point per sample over a range of time. it means I don't have a concret range for all samples. for example in channel 200 sample one starts at 0.29 minute and while in sample 2 it starts at 0.98 minute


Concerning 2: I don't get what you're trying to do. Combining different runs? If you see different retention times for several runs, it's usually not the fault of the CDS. what I try to do is like this

I have 20 samples, I want to get their profiles (chromatograms) and then do machine learning to distinguished them from bad and good. Not based on only one part of the profile but based on the entire peak . do you know how to extract data ?

[antonk]

Try to use our UniChrom - at least it reads every EzChrom data point (and converts them all to CDF or CSV)
Download :
http://www.unichrom.com/dle.php
Formats supported:
http://www.unichrom.com/chrom/uc-ffe.shtml
Console batch converter:
http://www.unichrom.com/chrom/ucce.shtml

[leaner]

I have already tried UniChrom. Can you please give an example how to extract all point ?

[antonk]

File / Open / -> select filter *.dat

File / Save As.. / -> Select filter *.txt - > export dialog appears
or
File / Save As. / -> Select IEEE 8-byte float (*.bin8)

or in console

./ucc ezchromfile.dat export.txt

or maybe your file imported in wrong way - please send a sample to unichrom at unichrom dot com

[leaner]

I just sent. One more question, can I install the Unichrom on a Mac system ?

[antonk]

it is very buggy, but indeed - yes, you can.
I'll upload a zip in a couple of days and point to download here.
At least it worked on 10.5, 10.6