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General approach for certain quantitative calculations for Instance of the variance of reversible adsorption to the capillary wall in CE
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- Farkas, Viktor (author)
- Uppsala universitet,Institutionen för biokemi och organisk kemi
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- Rezeli, Melinda (author)
- Uppsala universitet,Lund University,Lunds universitet,Avdelningen för Biomedicinsk teknik,Institutionen för biomedicinsk teknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Biomedical Engineering,Departments at LTH,Faculty of Engineering, LTH,Institutionen för biokemi och organisk kemi
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- Végvári, Ákos (author)
- Lund University,Lunds universitet,Avdelningen för Biomedicinsk teknik,Institutionen för biomedicinsk teknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Biomedical Engineering,Departments at LTH,Faculty of Engineering, LTH
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- Kilár, Ferenc (author)
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- (creator_code:org_t)
- 2008-11-26
- 2009
- English.
- In: Analytical Chemistry. - : American Chemical Society (ACS). - 1520-6882 .- 0003-2700. ; 81:1, s. 343-348
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Miniaturization of analytical separation methods offers several advantages, including short run times, high resolution, and high recovery of the sample constituents. To optimize these parameters, the reversible adsorption (to minimize loss in resolution), as well as the irreversible adsorption (to minimize loss of analytes) must be quantified. However, no useful equation is available for the calculation of the variance of reversible adsorption. Therefore, we have taken another approach to quantify the reversible interaction. The method is unique and important since no equation for calculation of this variance is required. Instead, two experiments are required, which are run under such conditions that the variance of a certain parameter has the same numerical value in the two experiments (one with and without EOF), except for the variance of reversible adsorption. The approach is universal in the sense that it can be used for many different mathematical concepts and be modified to also cover certain functions other than a sum of parameters. We have also introduced a simple expression for the irreversible adsorption, which shows that the hydrophobic interaction from only two methyl groups in the coating gives rise to as much as 40-50% loss of protein, and the width of the zones in the capillary with this coating was 8-15% larger compared to the zone width in the polyacrylamide-coated capillaries. The reproducibility in migration time, peak area, and peak width in two consecutive runs in capillaries with two methyl groups in the coating was very low, but in EOF-free polyacrylamide-coated capillaries extremely high, indicating that the reversible and irreversible adsorption of proteins to this coating is negligible. The scanning detector, frequently used in free zone electrophoresis in the 1960s-1970s, gives true separation parameters and is, therefore, much preferable to the stationary detector used in most CE experiments, because this detector gives apparent separation parameters.
Subject headings
- NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- electroosmotic flow
- variance
- EOF
- plate number
- coating
- adsorption
- microchip electrophoresis
- capillary electrophoresis
- mass spectrometry
- Chemistry
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- art (subject category)
- ref (subject category)
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- Farkas, Viktor
- Rezeli, Melinda
- Végvári, Ákos
- Kilár, Ferenc
- Hjertén, Stellan
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