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Modeling kinetics of subcellular disposition of chemicals.

Balaz S - Chem. Rev. (2009)

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmaceutical Sciences, College of Pharmacy, North Dakota State University, Fargo, North Dakota 58105, USA. stefan.balaz@ndsu.edu

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Relationship(2124) between the concentration c of the protein-bound chemical, the partition coefficient P, and the exposure time of distribution t for a pseudo-equilibrium situation: (A) projection into the plane c−P, (B) projection into the plane c−t, and (C) overall view. The values were calculated using eq 25 multiplied by P, with c0 = 1 unit, β = A = 1, B = 0.1, C = 0.01, and D = 0. Individual curves in projection A are valid for log t = −4 (curve 1), −3 (curve 2), −1.75 (curve 3), −0.5 (curve 4), 0.75 (curve 5), 1.25 (curve 6), 1.75 (curve 7), 2.75 (curve 8), 3.75 (curve 9), and 4.75 (curve 10). Individual curves in projection B are valid for log P = −4 (curve 10), −3 (curve 9), −2 (curve 8), −1 (curve 7), 0 (curve 6), 1.25 (curve 5), 2.5 (curve 4), 3.75 (curve 3), 5 (curve 2), and 6 (curve 1).(2124)
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fig29: Relationship(2124) between the concentration c of the protein-bound chemical, the partition coefficient P, and the exposure time of distribution t for a pseudo-equilibrium situation: (A) projection into the plane c−P, (B) projection into the plane c−t, and (C) overall view. The values were calculated using eq 25 multiplied by P, with c0 = 1 unit, β = A = 1, B = 0.1, C = 0.01, and D = 0. Individual curves in projection A are valid for log t = −4 (curve 1), −3 (curve 2), −1.75 (curve 3), −0.5 (curve 4), 0.75 (curve 5), 1.25 (curve 6), 1.75 (curve 7), 2.75 (curve 8), 3.75 (curve 9), and 4.75 (curve 10). Individual curves in projection B are valid for log P = −4 (curve 10), −3 (curve 9), −2 (curve 8), −1 (curve 7), 0 (curve 6), 1.25 (curve 5), 2.5 (curve 4), 3.75 (curve 3), 5 (curve 2), and 6 (curve 1).(2124)

Mentions: Note that the global elimination rate parameters ke and ke0 in eqs 23 and 24, as specified in eqs 62 and 63 (section ), are not plain summations: the rate parameters in individual compartments are weighted by the respective volumes, Vi, to scale the contributions to the total elimination according to the size of the compartments. The unbound non-ionized volume of distribution, Vdf, accounts for the effect of protein binding and membrane accumulation of chemicals on the available concentrations (eqs 23 and 24), and on the decrease in the elimination rates (eqs 62 and 63). An illustration of the latter phenomenon is given later in Figure 29 in section .


Modeling kinetics of subcellular disposition of chemicals.

Balaz S - Chem. Rev. (2009)

Relationship(2124) between the concentration c of the protein-bound chemical, the partition coefficient P, and the exposure time of distribution t for a pseudo-equilibrium situation: (A) projection into the plane c−P, (B) projection into the plane c−t, and (C) overall view. The values were calculated using eq 25 multiplied by P, with c0 = 1 unit, β = A = 1, B = 0.1, C = 0.01, and D = 0. Individual curves in projection A are valid for log t = −4 (curve 1), −3 (curve 2), −1.75 (curve 3), −0.5 (curve 4), 0.75 (curve 5), 1.25 (curve 6), 1.75 (curve 7), 2.75 (curve 8), 3.75 (curve 9), and 4.75 (curve 10). Individual curves in projection B are valid for log P = −4 (curve 10), −3 (curve 9), −2 (curve 8), −1 (curve 7), 0 (curve 6), 1.25 (curve 5), 2.5 (curve 4), 3.75 (curve 3), 5 (curve 2), and 6 (curve 1).(2124)
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fig29: Relationship(2124) between the concentration c of the protein-bound chemical, the partition coefficient P, and the exposure time of distribution t for a pseudo-equilibrium situation: (A) projection into the plane c−P, (B) projection into the plane c−t, and (C) overall view. The values were calculated using eq 25 multiplied by P, with c0 = 1 unit, β = A = 1, B = 0.1, C = 0.01, and D = 0. Individual curves in projection A are valid for log t = −4 (curve 1), −3 (curve 2), −1.75 (curve 3), −0.5 (curve 4), 0.75 (curve 5), 1.25 (curve 6), 1.75 (curve 7), 2.75 (curve 8), 3.75 (curve 9), and 4.75 (curve 10). Individual curves in projection B are valid for log P = −4 (curve 10), −3 (curve 9), −2 (curve 8), −1 (curve 7), 0 (curve 6), 1.25 (curve 5), 2.5 (curve 4), 3.75 (curve 3), 5 (curve 2), and 6 (curve 1).(2124)
Mentions: Note that the global elimination rate parameters ke and ke0 in eqs 23 and 24, as specified in eqs 62 and 63 (section ), are not plain summations: the rate parameters in individual compartments are weighted by the respective volumes, Vi, to scale the contributions to the total elimination according to the size of the compartments. The unbound non-ionized volume of distribution, Vdf, accounts for the effect of protein binding and membrane accumulation of chemicals on the available concentrations (eqs 23 and 24), and on the decrease in the elimination rates (eqs 62 and 63). An illustration of the latter phenomenon is given later in Figure 29 in section .

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmaceutical Sciences, College of Pharmacy, North Dakota State University, Fargo, North Dakota 58105, USA. stefan.balaz@ndsu.edu

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Related in: MedlinePlus