title: QSPR study of polychlorinated diphenyl ethers by molecular electronegativity distance vector (MEDV-4).
abstract: Polychlorinated diphenyl ethers (PCDEs) have received more and more concerns as a group of ubiquitous potential persistent organic pollutants (POPs). By using molecular electronegativity distance vector (MEDV-4), multiple linear regression (MLR) models are developed for sub-cooled liquid vapor pressures (P(L)), n-octanol/water partition coefficients (K(OW)) and sub-cooled liquid water solubilities (S(W,L)) of 209 PCDEs and diphenyl ether. The correlation coefficients (R) and the leave-one-out cross-validation (LOO) correlation coefficients (R(CV)) of all the 6-descriptor models for logP(L), logK(OW) and logS(W,L) are more than 0.98. By using stepwise multiple regression (SMR), the descriptors are selected and the resulting models are 5-descriptor model for logP(L), 4-descriptor model for logK(OW), and 6-descriptor model for logS(W,L), respectively. All these models exhibit excellent estimate capabilities for internal sample set and good predictive capabilities for external samples set. The consistency between observed and estimated/predicted values for logP(L) is the best (R=0.996, R(CV)=0.996), followed by logK(OW) (R=0.992, R(CV)=0.992) and logS(W,L) (R=0.983, R(CV)=0.980). By using MEDV-4 descriptors, the QSPR models can be used for prediction and the model predictions can hence extend the current database of experimental values.
authors.affiliation: School of Pharmaceutical Sciences, Research Laboratory of Pharmaceutical Chemistry and Biomaterials, Chongqing University of Medical Sciences, Chongqing 400016, China. sunlltxc@hotmail.com
authors.forename: Lili
authors.initials: L
authors.lastname: Sun
authors.forename: Liping
authors.initials: L
authors.lastname: Zhou
authors.forename: Yu
authors.initials: Y
authors.lastname: Yu
authors.forename: Yukun
authors.initials: Y
authors.lastname: Lan
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Li
mesh_terms: D055768:Halogenated Diphenyl Ethers; D015394:Molecular Structure; D010647:Phenyl Ethers / Q000737:chemistry*; D021281:Quantitative Structure-Activity Relationship
chemical_list: D055768:Halogenated Diphenyl Ethers; D010647:Phenyl Ethers; C021244:polychlorinated diphenyl ethers