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RegisterDistribution to erythrocytes of Methylphenidate [Bioanalytics]
Dear EKY,
» According to available data that methylphenidate and its metabolites are distributed between plasma (57%) and erythrocytes (43%) in blood.
If I interpret correctly what you wrote, concentrations are comparable in plasma and erythrocytes. So hemolysis will not release massive amounts of the drug or metabolites in plasma, contrary to e.g. ciclosporine.
» Can the respective plasma concentrations from hemolysis samples be fallacious?
Yes, possibly, by other ways. If you are using LC-MS/MS, you may have differences in matrix effects in hemolysed samples, but you are supposed to check for this during method validation. If you are using HPLC/UV, you may get chromatographic interferences. Whatever the method, you may have problems with recovery, or with analyte stability (see for instance this paper).
» According to available data that methylphenidate and its metabolites are distributed between plasma (57%) and erythrocytes (43%) in blood.
If I interpret correctly what you wrote, concentrations are comparable in plasma and erythrocytes. So hemolysis will not release massive amounts of the drug or metabolites in plasma, contrary to e.g. ciclosporine.
» Can the respective plasma concentrations from hemolysis samples be fallacious?
Yes, possibly, by other ways. If you are using LC-MS/MS, you may have differences in matrix effects in hemolysed samples, but you are supposed to check for this during method validation. If you are using HPLC/UV, you may get chromatographic interferences. Whatever the method, you may have problems with recovery, or with analyte stability (see for instance this paper).
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Regards
Ohlbe
Regards
Ohlbe
Complete thread:
- Distribution to erythrocytes of Methylphenidate EKY 2019-01-04 03:08 [Bioanalytics]
![[Mix]](https://static.bebac.at/img/mix.png "open in Mix view")
- Distribution to erythrocytes of MethylphenidateOhlbe 2019-01-06 19:07
Ing. Helmut Schütz