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Acute toxicity of substituted phenols to Rana japonica tadpoles and mechanism-based quantitative structure-activity relationship (QSAR) study
Acute 12 h and 24 h lethal toxicity (12 h-LC50 and 24 h-LC50) of 31 substituted phenols to Rana japonica tadpoles was determined. Results indicate that toxicity of phenols to tadpoles varied only slightly with length of exposure and the 12-h test could serve as surrogate of the 24-h test. A mechanism-based quantitative structure-activity relationship (QSAR) method was employed and 1-octanol/water partition coefficient (log Kow)-dependent models were developed to study different modes of toxic action. Most phenols elicited their response via a polar narcotic mechanism and an excellent log Kow-dependent model was obtained. Soft electrophilicity and pro-electrophilicity were observed for some phenols and a good log Kow-dependent model was also achieved. Additionally, the significant dissociation of carboxyl on benzoic acid derivatives sharply reduced their toxicity. A statistically robust QSAR model was developed for all studied compounds with the combined application of log Kow, energy of lowest unoccupied orbital (Elumo), heat of formation (HOF) and the first-order path molecular connectivity dices (1Chip).
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Reference£º
Piperidine – Wikipedia,
Piperidine | C5H17007N – PubChem