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- W2092161029 abstract "This study describes the capillary electrophoresis detection of the weak interaction occurring between the negative form of 4-(2-hydroxyethyl)-1-piperazine-ethanesulfonic acid (HEPES–) and nicotinamide-adenine dinucleotide (NAD+). The ion-paired complex is formed probably by 1 molecule of each reactant and it is sensitive to the applied electric field, since it was found that the value of the apparent association constant decreases as a function of the field applied. The association constant at zero field was obtained by extrapolation of the values determined at different applied field strengths and was found to be 2.0×103 M–1. The peak convolution observed at the detection window was representative of a dissociation process that started at the beginning of the separation. The rate of the field-induced dissociation corresponded to 6.4×10–10 mol·cm·L–1·V–1·s–1. Due to the complete absence of detectable signal shifts in 1H-NMR experiments, the interaction should be ascribed to the negative sulpho-moiety of HEPES– and to the positive charge of the NAD+ pyrimidine ring. To our knowledge, this is the first example of a “secondary Wien effect” observed at low field." @default.
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- W2092161029 date "2001-09-01" @default.
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- W2092161029 title "Capillary electrophoresis detection of a complex sensitive to electric field" @default.
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- W2092161029 doi "https://doi.org/10.1002/1615-9314(20010901)24:9<717::aid-jssc717>3.0.co;2-i" @default.
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