SsDNA degradation along capillary electrophoresis process using a Tris buffer. Issue 12 (20th March 2017)

• Record Type: Journal Article
• Authors: Ric, Audrey; Ong‐Meang, Varravaddheay; Poinsot, Verena; Martins‐Froment, Nathalie; Chauvet, Fabien; Boutonnet, Audrey; Ginot, Frédéric; Ecochard, Vincent; Paquereau, Laurent; Couderc, François
• Other Names: Lapizco‐Encinas Blanca H. guestEditor.; El Rassi Ziad guestEditor.
• Is Part Of: Electrophoresis. Volume 38:Issue 12(2017)
• Page Start: 1624
• Page End: 1631
• Publication Date: 2017-03-20
• Subjects: Biomolecules -- Capillary electrophoresis -- Oligonucleotides -- ssDNA degradation -- Tris‐Acetate buffer; Electrophoresis -- Periodicals; Electrophoresis -- Periodicals; 541.372
• DOI: 10.1002/elps.201600561
• Languages: English
• ISSNs: 0173-0835

Abstract

Abstract : Tris‐Acetate buffer is currently used in the selection and the characterization of ssDNA by capillary electrophoresis (CE). By applying high voltage, the migration of ionic species into the capillary generates a current that induces water electrolysis. This phenomenon is followed by the modification of the pH and the production of Tris derivatives. By injecting ten times by capillary electrophoresis ssDNA (50 nM), the whole oligonucleotide was degraded. In this paper, we will show that the Tris buffer in the running vials is modified along the electrophoretic process by electrochemical reactions. We also observed that the composition of the metal ions changes in the running buffer vials. This phenomenon, never described in CE, is important for fluorescent ssDNA analysis using Tris buffer. The oligonucleotides are degraded by electrochemically synthesized species (present in the running Tris vials) until it disappears, even if the separation buffer in the capillary is clean. To address these issues, we propose to use a sodium phosphate buffer that we demonstrate to be electrochemically inactive.