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Samenvatting Formules farmacokinetiek

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Alle formules uit de cursus in 1 document overzichtelijk samengevat.

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July 27, 2014
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October 8, 2014
Number of pages
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Written in
2012/2013
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Formules farmacokinetiek

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AurelieD




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DEEL A :GENEESMIDDELENDISPOSITIE
Passieve niet-ionische diffusie (p16)
Diffusiesnelheid = P x O x (C1 – C2)/d (Wet van Fick)
 P = permeabiliteitsconstante of diffusieconstante
 O = oppervlak
 C1 – C2 = concentratiegradiënt
 d = dikte van de membraan

Distributiecoëfficiënt (p17)
Voor een zuur: Log D = log P - log {1 + antilog (pH - pKa)} antilog is 10 tot de macht…
Voor een base: Log D = log P - log {1 + antilog (pKa - pH)}

Henderson-Hasselbach (p19)
Zuur: proton donor: pH = pKa + log

Base: proton acceptor: pH = pKa + log

Bepaling van de eiwitbinding (p67-69)
-
% binding =
[Cvrij] + [Pvrij] [Cgebonden]
 Cvrij = concentratie vrije farmacon
 Pvrij = concentratie vrije bindingsplaatsen
 Cgebonden = concentratie gebonden farmacon

KA = =
-
 KA = affiniteitsconstante
 n = aantal bindingsplaatsen per mol eiwit
 P = plasma-eiwitconcentratie

r= = vermits [Cgebonden] = KA[Cvrij] [Pvrij]


r= =

Indien er ‘n’ gelijke onafhankelijke bindingsplaatsen zijn




Scatchard plot (p69)

r= r + r KA [Cvrij] = nKA [Cvrij]
y = b - xa

1

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