Bioequivalence and Bioavailability Forum • Automatic integration

Automatic integration [Regulatives / Guidelines]

posted by janmacek – Czech Republic, 2008-08-27 14:21 (6139 d 10:05 ago) – Posting: # 2261
Views: 24,558

Dear colleagues,

another point I would like to discuss deals with chromatography (lines 477-481 and 613-614): "The Applicant should discuss the number of chromatograms (and percentage of total number of chromatograms) that have not been automatically integrated, the reason for a different method of integration, the value obtained with the automatic integration and the non-automatic integration and a justification for the acceptance of each individual chromatograms that has not been automatically integrated."

What is the "automatic integration"? The analyst always has to manually select integration parameters and save them in an integration method. This is not an automatic process (although the software may suggest some initial values), but arbitrary selection based on several sample chromatograms. Then, all samples are integrated using these parameters and (hopefully majority) of chromatograms are correctly integrated, but several others are not (by the way - what is correct integration? - the answer is not trivial with noisy baseline and/or tailing peaks). The chromatographer should inspect every chromatogram and, if needed, correct the integration obtained with pre-selected parameters.

The text in the guideline implies that "automatic integration" is golden standard and manual integration is suspicious, but this is simply not true. The golden standard is correctly integrated chromatogram, regardless whether this integration was obtained with pre-selected integration parameters or with manual integration. The correctness of the integration can be easily proved by the inspector.

The above mentioned requirement will increase workload in the analytical laboratory as for re-integrated chromatograms two copies should be stored in the archive - one with bad integration and the second with correct one. And the analyst will work with two values for a single sample - the incorrect original one and the improved one and this will certainly increase the chance of error. The justification for the acceptance of each individual chromatograms will be always the same - the original integration was incorrect.

I suggest to delete this requirement from the guideline.

Complete thread:

Critical review of EU BE guideline (Rev.1) Helmut 2008-08-22 14:30 [Regulatives / Guidelines]
- Critical review of EU BE guideline (Rev.1) d_labes 2008-08-22 15:42
  - Critical review of EU BE guideline (Rev.1) Helmut 2008-08-23 02:02
    - Critical review of EU BE guideline (Rev.1) d_labes 2008-08-25 09:14
      - Variations Helmut 2008-08-25 11:06
- Critical review of EU BE guideline (Rev.1) Jaime_R 2008-08-23 16:47
  - Critical review of EU BE guideline (Rev.1) Ravi 2008-08-25 08:19
    - Two Stage Design Helmut 2008-08-25 11:43
      - Two Stage Design JPL 2008-08-28 09:44
        
        Two Stage Design Helmut 2008-08-28 11:50
        
        Two Stage Design d_labes 2008-08-28 12:09
        Sequential Design Helmut 2008-11-05 13:22
  - Critical review of EU BE guideline (Rev.1) banusunman 2008-08-26 16:56
    - Washout Helmut 2008-10-15 16:02
- Critical review of EU BE guideline (Rev.1) d_labes 2008-08-25 09:49
  - Critical review of EU BE guideline (Rev.1) Helmut 2008-08-25 12:11
    - Critical review of EU BE guideline (Rev.1) d_labes 2008-08-25 13:03
    - Urban legend? Helmut 2008-11-21 16:06
      - Urban legend? d_labes 2008-11-24 15:06
- Critical review of EU BE guideline (Rev.1) d_labes 2008-08-25 11:16
- Critical review of EU BE guideline (Rev.1), tmax, MRT, LZ d_labes 2008-08-25 11:32
  - Critical review of EU BE guideline (Rev.1), tmax, MRT, LZ Helmut 2008-08-25 13:10
  - tmax, nonparametrics Helmut 2008-10-13 15:38
    - tmax, nonparametrics d_labes 2008-10-14 08:33
      - tmax, nonparametrics Helmut 2008-10-14 11:29
      - tmax, Canadian approach Helmut 2008-11-21 15:41
        
        tmax, Canadian approach d_labes 2008-11-24 13:53
        
        Early exposure, Canadian approach: GMR only! Helmut 2009-02-08 00:44
        
        Early exposure, Canadian approach: GMR only! d_labes 2009-02-09 08:50
        
        tmax; another example Helmut 2008-12-25 15:59
- Automatic integrationjanmacek 2008-08-27 12:21
  - Automatic integration Ohlbe 2008-08-27 14:49
    - Manual reintegration! H_Rotter 2008-08-28 11:28
      - Manual reintegration! ElMaestro 2008-08-28 12:44
- Subject accountability, Proc MIXED or equivalent d_labes 2008-09-02 11:13
  - Subject accountability, Proc MIXED or equivalent Ohlbe 2008-09-02 15:20
    - Subject accountability, Proc MIXED or equivalent d_labes 2008-09-02 16:30
- partial AUC, early exposure d_labes 2008-09-03 08:35
- HVDs? Helmut 2008-09-23 12:52
  - HVDs? d_labes 2008-09-23 14:20
  - HVDs? Helmut 2009-01-20 14:33
  - E.g., omeprazole Helmut 2009-03-06 17:21
- BCS-based Biowaiver Helmut 2008-09-25 15:48
  - Dissolution update Helmut 2008-10-13 12:43
- EUFEPS workshop Helmut 2008-12-23 17:03