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Optimization of Excitation and Detection Geometry for Multiplexed Capillary Array Electrophoresis of DNA Fragments

Volume 49, Number 5 (May 1995) Page 605-609

Lu, Xiandan; Yeung, Edward S.


A new on-column excitation and detection geometry for multiplexed array capillary electrophoresis is evaluated. The detection limit is improved 100-fold for the same laser power because of more efficient coupling of the laser beam. The illumination is also more uniform over the entire array. Stray light and cross-talk are effectively suppressed by immersing the capillaries in water to roughly match the refractive index. A charge-coupled-device (CCD) camera combined with cutoff filters provides adequate sensitivity and speed for high-speed DNA sequencing based on sieving in a polymer-matrix solution.