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• W2082916112 abstract "This work proposes a new capillary electrochromatography (CEC) method for determination of drug partition in membrane phospholipids. CEC experiments were carried out in a 100 μm (ID) fused-silica capillary, partially packed with a chromatographic phospholipid stationary phase, so-called Immobilized Artificial Membrane, IAM.PC.DD2. The observed retention values were corrected by both the electro-osmotic and electrophoretic mobility values, measured by capillary electrophoresis (CE) experiments, assuming the values of the logarithms of chromatographic affinity factors, log k(CEC) as indexes of affinity for phospholipids. Analogously to biochromatography, all the values were determined with a totally aqueous mobile phase, or extrapolated to 100% aqueous buffer. The analytes were 16 structurally unrelated compounds, of basic, neutral, and acidic nature. To evaluate the effectiveness of CEC data to describe partition in phospholipids, log k(CEC) were related to both log P and log k(w)(IAM) values. log P are the lipophilicity values expressed as the logarithms of n-octanol/water partition coefficients and log k(w)(IAM) are the retention data measured by High Performance Liquid Chromatography (HPLC) on an IAM.PC.DD2 column, assumed as the reference values for phospholipid affinity. Phospholipid affinity scale by CEC related to that achieved by HPLC, but only if two different subclasses were considered separately, i.e. protonated and unprotonated analytes; indeed, all the compounds protonated at the experimental pH value (7.0) were retained stronger in CEC than in HPLC. This discrepancy may be due to the use of different buffers in CEC and HPLC since, to avoid the occurrence of a high current, the eluent in CEC experiments was of different composition and lower ionic strength than in HPLC. CEC analyses were faster and required lower amounts of both solvent and stationary phase than HPLC; moreover, with the exception of only three analytes, all analyses were performed with 100% aqueous eluents avoiding time-consuming and tedious extrapolation procedures." @default.
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• W2082916112 date "2011-04-01" @default.
• W2082916112 modified "2023-09-27" @default.
• W2082916112 title "Capillary electrochromatography as a new tool to assess drug affinity for membrane phospholipids" @default.
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• W2082916112 doi "https://doi.org/10.1016/j.jpba.2010.11.037" @default.
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