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Application  No.L489
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            n Linearity                                        n Analysis of a Pharmaceutical Excipient
            Fig. 3 shows the calibration curve of mannitol analyzed   Fig. 5 shows an example of analysis of a pharmaceutical
            using the conditions of Table 1. The correlation   excipient, consisting mainly of mannitol, using a 20 μL
            coefficient over the concentration range from 1 to   injection of 50 g/L sample solution. The chromatogram
                      2
            100 g/L is R  = 0.999, demonstrating excellent linearity.  of the excipient is shown in the upper portion of the
                                                               figure, while an expanded view of the chromatogram is
                Area (×10 ) 5                                  shown in the lower portion. Trace levels of other
               275                                             substances, including sorbitol and isomalt, were also
                                                               detected in the excipient.
               250    R =0.999
                       2
               225
                                                                   uRIU
                                                                 1000
               200
                                                                  750
               175                                                                         Mannitol
                                                                  500
               150
               125                                                250
               100                                                 0
                                                                   0.0    5.0   10.0  15.0   20.0  25.0  min
                75
                                                                   uRIU
                50                                                10
                                                                   9                  Mannitol
                25
                                                                   8
                0                                                  7
                 0.0    25.0   50.0   75.0   100.0 Conc. (g/L)
                                                                   6
                       Fig. 3 Linearity of Calibration Curve       5                             Sorbitol
                                                                   4
            n Effect of Column Temperature
                                                                   3
            Fig. 4 shows the chromatograms obtained in analysis of   2
            the four sugar alcohol standard samples using the two   1              Isomalt
            column oven temperatures of 85 °C and 60 °C. The       0
            upper pair of chromatograms are those of isomalt and   0.0    5.0   10.0  15.0   20.0  25.0  min
            maltitol, and the lower pair, of mannitol and sorbitol.
            When the column temperature is lowered to 60 °C, the     Fig. 5  Chromatogram of Pharmaceutical Excipient
            retention time of mannitol becomes 23 minutes, at            Upper: Chromatogram
            which point the system suitability requirement is no         Lower: Expanded Chromatogram
            longer satisfied.                                  Reference
            When analysis is conducted at a high column        1)  United States Pharmacopeia, Second Supplement to  USP 37–NF 32
            temperature like 85 °C, it is important that the
            temperature be maintained uniformly over the entire      The samples used to produce this application were kindly provided
            length of the column. The CTO-20AC column oven       by Nihon Generic Co., Ltd.
            used in this analysis is equipped with forced air
            circulation, thereby permitting stable analysis even at
            high temperatures.
                uRIU
                                   2       ■ Peaks
               25
                                             1. Isomalt (1)
               20                            2. Maltitol
                                  1  3
               15  85 ˚C                     3. Isomalt (2)
               10
                5  60 ˚C            1  2, 3
                0
                0.0  2.5  5.0  7.5  10.0  12.5  15.0  17.5  20.0  22.5  25.0  27.5 min
                uRIU
               600
                                       4   5  ■ Peaks
               500                             4. Mannitol
                                               5. Sorbitol
               400
                   85 ˚C
               300
               200                       4     5
               100  60 ˚C
                0
                0.0   5.0  10.0  15.0  20.0  25.0  30.0  min
              Fig. 4  Chromatograms of a Standard Mixture of Four Sugar
                  Alcohols (85 °C, 60 °C)
                                                                                                      First Edition: Apr. 2015


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