how to ignore the area of the compounds used for RRT

Question

Hello,
I want to calculate the % area of an unknown sample using Openlab CDS 2.7. I add 1-pentanol for RRT calculation and I want to exclude its area for the % area calculation. I do not know if there is any option to exclude the area for the “RRT compounds” or if I have to do a custom calculation for that.
Thank you very much for your help.
Oihana

martin.adams · Answer

Hello, 
 
 You would need to do a custom calculation to get that result. See the example below. I show 2 ways to do the total area calculation. The first is using the peak status as a time reference the other is by the compound name. 
 
 By Is time reference 
 
 TotalAreaAdj Scope - Signal Type-Double 
 CurrentSignal. AllPeaks . Where ( function (x) x. Compound_IsTimeReference = False ). Select ( function (x) x. Peak_Area ). Sum 
 
 OR 
 
 By compound name with the name as a separate CC to allow you to change it without editing the CC directly 
 
 CompName Scope - Sequence Type - String 
 "YOUR COMPOUND NAME" 
 
 TotalAreaAdj Scope - Signal Type-Double 
 CurrentSignal.AllPeaks.Where(function(x) x.Compound_Name.ToUpper() <> GetStringCC("CompName")).Select(function(x) x.Peak_Area).Sum 
 
 Final calculation for either method 
 
 AreaPercentAdj Scope - Peak or Group Type - Double 
 Peak_Area / CurrentSignal.GetDoubleCC("TotalAreaAdj") * 100 
 
 Marty

how to ignore the area of the compounds used for RRT

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