cALIBRATION CURVE RETENTION TIME

Hello,

What software are you using? So, you want the actual RT of the peaks as found in the calibration injection. If you are using CDS 2.x, the custom calculation below would give each compounds RT delta from the average RT for the same peak in the calibration standards. 

Marty 

Scope: Peak or Group     Type: Double 

Abs(Peak_RetentionTime - CurrentSequence.AllIdentifiedPeaks.Where(function (x) x.Compound_Name = CurrentPeakorGroup.Compound_Name).Where(function(x) x.Injection.Sample.Sample_Type = 1).Select(function(x) x.Peak_RetentionTime).Average)

thanks, but this formula will only work if the calibrators are in the resultset.
Can we extract the retention times from the respective calibration curves, in order to be able to use it in Openlab 2.5, thanks for your help
SYB

Hello,

No that is not possible in CC or IR if the calibration standards are not present in the result set. What you could do is setup the method to update the method RT at 100% when running the standards. This way the expected RT is the same as the found calibration standard RTs for each compound. At that point you could just subtract the ERT from the RT to get the delta. 

Marty

Thank you, I'll do as you say,

SYB

thank you for your help, I'll try later, syb