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Enantioselective Toxic Effects and Degradation of Myclobutanil Enantiomers in Scenedesmus obliquus
Author(s) -
Cheng Cheng,
Huang Ledan,
Diao Jinling,
Zhou Zhiqiang
Publication year - 2013
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.22226
Subject(s) - myclobutanil , chemistry , botany , biology , fungicide
Research on the enantioselective environmental behavior of chiral pesticides has been a hot spot of environmental chemistry recently. In this study, the acute toxicity of myclobutanil enantiomers was investigated with the aquatic algae Scendesmus obliquus . After exposure for 96 h, the EC 50 values for (−)‐myclobutanil, rac ‐myclobutanil and (+)‐myclobutanil were 3.951, 2.760, and 2.128 mg/L, respectively. The photosynthetic pigment (chlorophyll a, chlorophyll b, and carotenoids) and antioxidant enzyme activities catalase (CAT) were determined to evaluate the different toxic effects when S. obliquus were exposed to 1.5, 5 and 15 mg/L of rac ‐myclobutanil, (−)‐myclobutanil, and (+)‐myclobutanil for 96 h, respectively. In addition, the degradation of myclobutanil enantiomers in S. obliquus was also studied. Myclobutanil in the medium inoculated with algae degraded faster than in the uninoculated medium. The degradation of (−)‐myclobutanil was faster than that of (+)‐myclobutanil at a concentration of 3 mg/L. On the basis of these data, the acute toxicity and toxic effects of myclobutanil against S. obliquus were concluded to be enantioselective , and such enantiomeric differences should be taken into consideration in pesticide risk assessment . Chirality 25:858–864, 2013 . © 2013 Wiley Periodicals, Inc.