A simple, rapid, and sensitive stopped-now kinetic fluorometric approach was established for the assay of DNA in synthetic samples and real samples by using the measures of initial reaction rate. The increased initial reaction rate is in proportion to the concentration of DNA in the range of 2.0 x 10(-8) M to 2.1 x 10(-6) M. The optimum conditions for various parameters on which the binding of Ru(phen)(2)(dppz)(2+) to DNA depends, were investigated. The influence of various surfactants on the interaction was discussed. Furthermore, stopped-flow techniques were employed to determine kinetic parameters of Ru(phen)(2)(dppZ)(2+) binding to DNA under pseudo-first-order conditions. It was found that the interaction of Ru(phen)(2)(dppZ)(2+) with DNA was very fast. A two-step reaction mechanism, a fast phase followed by a slow phase, was proposed. (C) 2008 Elsevier B.V. All rights reserved.
机构:
Wuhan Univ, Coll Life Sci, Key Lab MOE Dev Biol, Wuhan 430072, Peoples R ChinaWuhan Univ, Coll Life Sci, Key Lab MOE Dev Biol, Wuhan 430072, Peoples R China
Wang, RY
Gao, X
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Wuhan Univ, Coll Life Sci, Key Lab MOE Dev Biol, Wuhan 430072, Peoples R ChinaWuhan Univ, Coll Life Sci, Key Lab MOE Dev Biol, Wuhan 430072, Peoples R China
Gao, X
Lu, YT
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Wuhan Univ, Coll Life Sci, Key Lab MOE Dev Biol, Wuhan 430072, Peoples R ChinaWuhan Univ, Coll Life Sci, Key Lab MOE Dev Biol, Wuhan 430072, Peoples R China