Page 80 - Application Handbook - Liquid Chromatography
P. 80

LAAN-A-LC-E240







            Application                  High Performance Liquid Chromatography

            News                         Analysis of Histamine and Tyramine Using Prominence


                                         Amino Acid Analysis System
            No.L463





            Putrefactive non-volatile amines, histamine and tyramine, are   mV
            formed through decomposition of histidine and tyrosine,   200
            respectively, due to the action of microorganisms. When                       1  ■Peaks
            ingested food such as processed products and red-fleshed fish                     1. Histamine
            such as tuna, bonito, mackerel, etc., contain a large amount of   150             2. Tyramine
            histamine, food poisoning symptoms such as fever, hives, and
            palpitations may appear. There are also reported cases of food   100
            poisoning associated with fermented foods such as wine and
            cheese. Further, tyramine can also strengthen the toxicity of                      2
            histamine, and has been reported as a causative agent in food-  50
            associated migraine.
            Although there are no specific histamine-related regulations in
            Japan, in other countries, including the United States and the   0
            EU, Codex (International Food Standards) regulatory limits for   0  5         10         15  min
            histamine have been established for fish and fishery products.
            As tyramine and histamine, like amino acids, contain an amino   Fig. 1  Chromatogram of Histamine and Tyramine Standard
            group, fluorescence detection is possible using derivatization   Solution (Each 10 mg/L)
            with ortho-phthalaldehyde (OPA). Here, we introduce an
            example of analysis of tyramine and histamine using the
            Prominence Amino Acid Analysis System, in which detection is
            conducted using post-column fluorescence derivatization.   n Linearity
            Mobile phase and reagent kits, which are available for this   Fig. 2 shows the linearity of histamine and tyramine
            application, contain the required mobile phases and reaction   using a concentration range from 0.1 mg/L to
            reagent solution, thus eliminating the tedious preparation of   100 mg/L. Excellent linearity was obtained with a
            mobile phase. Moreover, as sample pretreatment consists only   coefficient of determination greater than R =0.9998 for
                                                                                                  2
            of filtering and dilution for this application, analysis can be   both substances.
            conducted without complicated processing.

            n Analysis of Standard Solution
            The analytical conditions that were used are shown in
            Table 1, and the chromatogram obtained from analysis of   60000
            a standard solution of histamine and tyramine (each at
            10 mg/L) is shown in Fig. 1. The standard solution was
            prepared by dissolving these in pH 2.2 sodium citrate   50000
            buffer solution. For the mobile phases, the mobile phase                         R 2  = 0.9998
            B and C of the Amino Acid Mobile Phase kits (Na type)   40000        Histamine
            were used, and analysis was conducted using gradient
            elution. Also, because the elution positions vary                    Tyramine
            depending on the mobile phase pH, use of a carbon      Area (×10 3 )  30000
            dioxide gas trap is suggested when conducting analysis.
                                                                    20000
                         Table 1  Analytical Conditions                                      R 2  = 0.9999
             Column     : Shim-pack Amino-Na (100 mm L. × 6.0 mm I.D.)
             Ammonia Trap   : Shim-pack ISC-30 / S0504Na (50 mm L. × 4.0 mm I.D.)  10000
             Mobile Phase   : Amino Acid Mobile Phase Kits
                          (Na type, Mobile Phase B and C)
             Time Program   : Time (min)    B. Conc. (%)                0
                           0          80
                           15.00      65                                 0    20     40    60    80   100
                           15.01       0                                          Concentration (mg/L)
                          20.00        0
                          20.01       80
                          25.00      Stop                        Fig. 2  Linearity of Histamine and Tyramine (0.1 – 100 mg/L)
             Flowrate   : 0.6 mL/min
             Column Temp.   : 60 °C
             Reagent    : Amino Acid Reagent Kits
             Flowrate of Reagent : 0.2 mL/min
             Reaction Temp.   : 60 °C
             Detection   : RF-20Axs, Ex at 350 nm, Em at 450 nm
             Injection Vol.   : 10 µL
   75   76   77   78   79   80   81   82   83   84   85