Relative migration time ratio

In the present work, a dual marker form of analysis, called the relative migration time ratio (RMTR), was used to obtain a value for between a... 

Henion et al. ° reported the first use of CE/ESEQIT to quantitatively determine the amounts of the isoquinoline alkaloids berberine and palmatine in the bark of Phellodendron wilsonii. Dried P. wilsonii tree bark is used in China and other countries to treat dysentery and jaundice. Relative migration times and ESI source CAD was used to identify these compounds. Signal-to-noise ratios greater than 10 were demonstrated for mass chromatograms of a synthetic mixture of these compounds at the 400- to 500-atmol level. At the picogram level, the calibration curves for berberine and palmatine were linear. Berberine and palmatine were determined in the bark at 13.95 pg/mg and 0.234 pg/mg, respectively. 

Fan et al. [106] developed a high performance capillary electrophoresis method for the analysis of primaquine and its trifluoroacetyl derivative. The method is based on the mode of capillary-zone electrophoresis in the Bio-Rad HPE-100 capillary electrophoresis system effects of some factors in the electrophoretic conditions on the separation of primaquine and trifluoroacetyl primaquine were studied. Methyl ephedrine was used as the internal standard and the detection was carried out at 210 nm. A linear relationship was obtained between the ratio of peak area of sample and internal standard and corresponding concentration of sample. The relative standard deviations of migration time and the ratio of peak area of within-day and between-day for replicate injections were <0.6% and 5.0%, respectively. 

Figure 4 Orbital distribution of classical and resonant KBOs. The numbers at top are ratios of the orbital periods (time to complete an orbit) of the objects to the orbital period of Neptune. The objects clustered around the 3 2 resonance are Plutinos swept up by the outward migration of Neptune. The large range of orbital inclinations produces in relative collision speeds comparable to the orbital speed ( 4 km s ) (source Luu and Jewitt, 2002).

---