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- W2072437299 abstract "In sample-stacking techniques, the detection limit cannot be improved by simply increasing the length of the sample solution, because the individual electrophoretic parameters must be optimized. In an attempt to increase the amount of sample injected, as well as to focus them onto a small zone, two novel methods are proposed. One of these employs an ultra-high conductivity zone, which was inserted between the sample zone and background solution to build an unequal conductivity gradient. The other employs a low temperature bath. A portion of the capillary (near the junction between the sample solution and the background solution) was immersed in a low temperature bath, which served as a pseudo-high-conductivity zone due to the fact that conductivity would increases when the temperature is decreased. As a result, a large volume of sample injection can be achieved. Using 3,4-methylenedioxymethamphetamine as a model compound, the detection limit was determined to be 1.6 x 10(-6) M (S/N = 3) by means of normal non-aqueous capillary electrophoresis (NACE). This could be improved to 3.0 x 10(-8) M, 4.8 x 10(-9) M and 5.0 x 10(-9) M, respectively, when the normal stacking, ultra-high conductivity zone NACE-stacking and the low-temperature zone NACE-stacking methods were applied." @default.
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- W2072437299 date "2005-03-01" @default.
- W2072437299 modified "2023-09-26" @default.
- W2072437299 title "Sample-stacking techniques in non-aqueous capillary electrophoresis" @default.
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- W2072437299 doi "https://doi.org/10.1016/j.chroma.2004.12.095" @default.
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