title: Quantification of joint effect for hydrogen bond and development of QSARs for predicting mixture toxicity.
abstract: A QSAR model is successfully proposed to predict the toxicity effect on Photobacterium phosphoreum by nonpolar-narcotic-chemical mixtures and/or polar-narcotic-chemical mixtures. For nonpolar-narcotic-chemical mixtures and polar-narcotic-chemical mixtures, their corresponding hydrophobicity-based QSAR models are derived from regression analysis. Comparison of these two QSAR models make us believe that it is the joint effect of hydrogen bond in polar-narcotic-chemical mixture that leads to the difference between these two models. Such joint effect of hydrogen bond can be quantified as AMH and BMH by using the different partition coefficients of mixtures in various organic phase/water systems. And the regression analysis results convinced us that the introduction of AMH does improve the quality of the QSAR model with r2=0.948, S.E.=0.166 and F=745.201 at P=0.000 for total 84 mixtures.
authors.affiliation: Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou 510301, PR China. lzhifen@yahoo.com
authors.forename: Zhifen
authors.initials: Z
authors.lastname: Lin
authors.forename: Ping
authors.initials: P
authors.lastname: Zhong
authors.forename: Kedong
authors.initials: K
authors.lastname: Yin
authors.forename: Liansheng
authors.initials: L
authors.lastname: Wang
authors.forename: Hongxia
authors.initials: H
authors.lastname: Yu
mesh_terms: D004357:Drug Synergism; D005544:Forecasting; D006860:Hydrogen Bonding; D008962:Models, Theoretical; D010776:Photobacterium / Q000187:drug effects*; D021281:Quantitative Structure-Activity Relationship; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical