Characterization of high molecular mass linear polyacrylamide powder prepared by emulsion polymerization as a replaceable polymer matrix for DNA sequencing by capillary electrophoresis

Electrophoresis
W GoetzingerB L Karger

Abstract

In a previous paper, a 2% w/w replaceable high molecular mass linear polyacrylamide solution (high molecular mass LPA) was used to achieve long read-lengths for DNA sequencing by capillary electrophoresis (E. Carrilho et al., Anal. Chem. 1996, 68, 3305-3313). In that work, the polymer was prepared by polymerization in water at 6% w/w, followed by dilution to 2% w/w. In this study, an improved method for preparation of high molecular mass LPA was developed, based on inverse emulsion polymerization. With this polymerization procedure, the LPA results in a molecular mass of approximately 9 MDa, with characteristics of a fine powder of high purity and practically unlimited shelf life. Using size exclusion chromatography (SEC) and viscosity measurements to characterize the polymer, good batch-to-batch reproducibility was found. It was observed that the viscous polymer solutions made from these high molecular mass polymers require careful preparation and handling because the method of dissolution could affect the molecular mass distribution and the resultant separation of DNA components. Solutions containing 2% w/w of LPA made by emulsion polymerization were simple to prepare, resulting in excellent performance as a replaceable matri...Continue Reading

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