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Retention-time locked comprehensive multidimensional gas chromatography

  • US 6,494,078 B1
  • Filed: 06/25/2001
  • Issued: 12/17/2002
  • Est. Priority Date: 06/25/2001
  • Status: Active Grant
First Claim
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1. A method of retention time locking a multidimensional GC system, comprising:

  • (i) configuring operating parameters of a reference multidimensional GC system in accordance with a known chromatographic method, wherein the reference multidimensional GC system includes more than one column connected in series, each of the columns having a known stationary phase, nominal diameter and length, and phase ratio;

    (ii) introducing one or more target analytes into the reference multidimensional GC system yielding defined analyte retention times and/or defined void times for one or more columns of the reference multidimensional GC system;

    (iii) configuring operating parameters of a locking multidimensional GC system in accordance with the known chromatographic method, wherein the locking multidimensional GC system includes a same number of columns connected in series as the reference multidimensional GC system, each of the same number of columns having a same known stationary phase, nominal diameter and length and phase ratio as the reference multidimensional GC system and wherein each column of the locking multidimensional GC system has a head pressure;

    (iv) locking the retention times of the target analytes or void times on one or more columns of the locking multidimensional GC system, beginning with a last column in series to be locked and proceeding sequentially to a first column to be locked, by adjusting the head pressure of the column to be locked such that the retention times of the target analytes or column void times measured on the locking multidimensional GC system are matched to the corresponding defined analyte retention times and/or defined column void times.

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