title: Development of partition coefficients, Vmax and Km values, and allometric relationships.
abstract: A knowledge of the methods used to obtain partition coefficients, Vmax, and Km values, and the use of allometric relationships is essential to understanding their role in physiologically based pharmacokinetic (PBPK) models. Vial equilibration methods for obtaining the partition coefficients of volatile and nonvolatile compounds were presented using the results from studies with p-chlorobenzotrifluoride (PCBTF) and isofenphos, respectively. Partition coefficients for volatile and nonvolatile compounds from published studies were included. Several published in vivo inhalation (gas uptake) studies and in vitro enzyme studies were presented to demonstrate several methods for obtaining Vmax and Km values. Allometric equations used in PBPK models for body weight scaling of respiration and cardiac rates between species were presented along with equations for within species body weight scaling of Vmax.
authors.affiliation: Occidental Chemical Corporation, Niagara Falls, NY, USA.
authors.forename: J B
authors.initials: JB
authors.lastname: Knaak
authors.forename: M A
authors.initials: MA
authors.lastname: al-Bayati
authors.forename: O G
authors.initials: OG
authors.lastname: Raabe
mesh_terms: D000818:Animals; D006801:Humans; D008954:Models, Biological; D010599:Pharmacokinetics; D012997:Solvents / Q000493:pharmacokinetics; D013045:Species Specificity; D014018:Tissue Distribution
chemical_list: D012997:Solvents