Extended Langmuir approach to analyze the telomeric sequence using a biochromatographic concept |
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Authors: | C André YC Guillaume |
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Institution: | a Equipe des Sciences Séparatives et Biopharmaceutiques (2SB), Laboratoire de Chimie Analytique, Faculté de Médecine et de Pharmacie, Universite de Franche-Comte, Place Saint-Jacques, 25030 Besançon Cedex, France b Laboratoire de Chimie Organique, Faculté de Médecine et de Pharmacie, Universite de Franche-Comte, Place Saint-Jacques, 25030 Besançon Cedex, France |
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Abstract: | Immobilization of single-stranded DNA (ssDNA) on chromatographic support, i.e. copolymerized particles of styrene and glycidyl methacrylate via formation of amino groups with either N-methyl-1,3-propanediamine (stationary phase 1) or hexamethylenediamine (stationary phase 2) is a promise method to separate sequence specific DNA. However, the low ligand density of nonporous particles led to nonspecific interaction of the complementary oligonucleotide DNA in the sample with the stationary phase (1 or 2). In this paper, the binding process of telomere (tel; TTAGGG) to the complementary ssDNA immobilized (AATCCC) on the two chromatographic supports was studied for the first time using extended Langmuir equation. It appeared that the nonspecific adsorption of the tel due to electrostatic interaction between the polynucleotide sample (tel) and the residual amino groups on the particle surface via amination with hexamethylenediamine (stationary phase 2) was significant and could be reduced by using a high salt (NaCl) concentration in the bulk solvent. In contrast, the nonspecific adsorption of tel was neglected in the column using DNA-immobilized particles via amination with N-methyl-1,3-propanediamine (stationary phase 1). Thus, the affinity chromatography prepared via amination by N-methyl-1,3-propanediamine was more effective for analysis of sequence-specific DNA than the one prepared via amination by hexamethylenediamine.Moreover, for the two stationary phases, increasing NaCl concentration in the bulk solvent enhanced the hybridization between tel and the complementary immobilized oligonucleotide. |
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Keywords: | Telomeric sequence Single-stranded DNA Polynucleotide |
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