代谢
JP-8喷气燃料是由芳香烃和脂肪烃组成的复杂混合物。这项研究旨在确定半挥发性正构烷烃(壬烷C9、癸烷C10和十四烷C14)在大鼠肝脏微粒体氧化中的体外代谢速率常数。通过气相色谱测量母化合物的消失来评估代谢。将不同浓度的正构烷烃与成年雄性F-344大鼠的肝脏微粒体一起孵化。壬烷和癸烷的非线性动力学常数分别为V(max)(nmol/mg蛋白质/min)= 7.26 +/- 0.20和2.80 +/- 0.35,K(M)(uM)= 294.83 +/- 68.67和398.70 +/- 42.70。通过内在清除率(V(max)/K(M))评估的代谢能力,壬烷大约是癸烷的四倍(0.03 +/- 0.005比0.007 +/- 0.001)...这些结果表明,正构烷烃的代谢清除率与其链长呈负相关。这些代谢速率常数将用于更新现有的非烷和癸烷的基于生理的药代动力学(PBPK)模型,作为开发JP-8的PBPK模型的一部分。
Jet propellant 8 (JP-8) jet fuel is a complex mixture of aromatic and aliphatic hydrocarbons. The aim of this study was to determine in vitro metabolic rate constants for semivolatile n-alkanes, nonane (C9), decane (C10), and tetradecane (C14), by rat liver microsomal oxidation. The metabolism was assessed by measuring the disappearance of parent compound by gas chromatography. Various concentrations of n-alkanes were incubated with liver microsomes from adult male F-344 rats. Nonlinear kinetic constants for nonane and decane were V(max) (nmol/mg protein/min) = 7.26 +/- 0.20 and 2.80 +/- 0.35, respectively, and K(M) (uM) = 294.83 +/- 68.67 and 398.70 +/- 42.70, respectively. Metabolic capacity as assessed by intrinsic clearance (V(max)/K(M)) was approximately four-fold higher for nonane (0.03 +/- 0.005) than for decane (0.007 +/- 0.001)... These results show a negative correlation between metabolic clearance and chain length of n-alkanes. These metabolic rate constants will be used to update existing physiologically based pharmacokinetic (PBPK) models for nonane and decane as part of developing a PBPK model for JP-8.
来源:Hazardous Substances Data Bank (HSDB)