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Application   No. L520
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              Analysis of Montelukast Sodium Using              Correction of System Volume Utilizing the
               Nexera-i MT                                        ACTO Function
            Nexera-i MT has two flow channels of HPLC and UHPLC   Here we introduce an example of method transfer from
            and enables  method switching from HPLC to UHPLC   another LC system using the ACTO (Analytical Condition
            within a single instrument. In this analysis, montelukast   Transfer and Optimization) function, which is a standard
            sodium was analyzed using the HPLC channel of Nexera-i   feature of the Shimadzu integrated liquid chromatograph
            MT. The obtained chromatogram is shown in Fig. 3 and   "i-Series" and work station "LabSolutions".
            indicates that the related substances listed in the JP are   If an analytical method on  an existing LC system is
            also identified. Table 3 shows results of the system   transferred to another LC system, the retention time may
            suitability test.
                                                               not be identical due to the  difference in dwell volume,

                                                               pump specifications, etc. In such a case, the gradient start
                                                               time adjustment function, which is a feature in the ACTO
                 mAU
               150
                                                               function, can be executed to adjust the gradient start time
                                                               for the specified volume.
                               B
               125                   Montelukast Sodium        Fig. 4 (a) shows the chromatogram obtained using
                                                               Prominence-i and Fig. 4 (b) shows the one obtained using
                                                               Nexera-i MT's HPLC channel. In the analysis using Nexera-
               100                                             i MT, the gradient start time adjustment function was
                                                               enabled to correct the difference in volume between the
                                                               systems, thereby obtaining a chromatogram congruent
               75
                                                               with that from Prominence-i. (Table 4)

               50                                                   mAU
                                     E                            200
                                                 F
                                C, D
                                                                                       Montelukast Sodium
               25
                     Impurity A
                                                                  150            B
               0
                                                                                        E
                 0.0   2.5  5.0   7.5   10.0  12.5  15.0 min                       C, D             F
                                                                      (b)
                                                                  100
                                                                        Impurity A
                   Chromatogram of Montelukast Sodium Standard for
                    System Suitability Test Using Nexera-i MT

                                                                  50
               Table 3  Results of System Suitability Test (Nexera-i MT)
               System Suitability Requirements   Results   Judgements  (a)
                  Resolution
              (Montelukast Sodium   ≥ 2.5   3.8   PASSED
                and Impurity B)                                    0
                  Resolution
              (Montelukast Sodium   ≥ 1.5   2.8   PASSED
                and Impurity E)                                     0.0   2.5  5.0   7.5   10.0  12.5  15.0 min
              System Repeatability   ≤ 0.73 %   0.21   PASSED
                 (% RSD Area)
                                                                      Method Transfer Example Using Gradient Start Time
                                                                  Adjustment Function  (a) Prominence-i  (b) Nexera-i MT

                                                                    Table 4  Difference in Retention Time (%) between
                                                                           Prominence-i and Nexera-i MT
                                                                                 Before Gradient   After Gradient
                                                                   Component
                                                                                   Adjustment     Adjustment
                                                                    Impurity  A      1.3            1.1
                                                                    Impurity  B      2.7            0.3
                                                                   Impurity C, D     3.1            0.2
                                                                 Montelukast Sodium  2.7            −0.1
                                                                    Impurity  E      2.8            −0.1
                                                                    Impurity  F      2.5            −0.3

                                                                                                       First Edition: Jul. 2017
                                             For Research Use Only. Not for use in diagnostic procedure.
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