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- W2077022522 abstract "Ultrafiltration is a rapid and convenient method to determine the free concentrations of drugs. In the present work, we aimed to develop an ultrafiltration method which is appropriate for routine determination of the free fraction of vancomycin and highly protein bound beta-lactams such as ertapenem, ceftriaxone and cefazolin in plasma from intensive care unit patients. Different filter types and experimental conditions (molecular weight cut-off, centrifugal force and time, pH, temperature) were evaluated and found to have influence on the result. In the final protocol, serum or plasma was buffered to pH 7.4–7.5, ultrafiltered at 1000 × g at 37 °C for 20 min using Nanosep Omega 10 K filters and subsequently analysed for the antibiotics by RP-HPLC with UV detection. The data from our investigation suggest to aim physiological conditions, i.e. 37 °C and pH 7.4, and low to moderate relative centrifugal forces in order to get reliable results. With regard to the chromatographic separation, modulation of the pH in the range of 2.5–7.0 allows to determine several beta-lactams isocratically and/or to avoid interferences by co-administered drugs." @default.
- W2077022522 created "2016-06-24" @default.
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- W2077022522 date "2014-06-01" @default.
- W2077022522 modified "2023-10-03" @default.
- W2077022522 title "Determination of free vancomycin, ceftriaxone, cefazolin and ertapenem in plasma by ultrafiltration: Impact of experimental conditions" @default.
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- W2077022522 doi "https://doi.org/10.1016/j.jchromb.2014.05.021" @default.
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