Stereoselective degradation behaviour of carfentrazone-ethyl and its metabolite carfentrazone in soils

Abstract

R-(+)-carfentrazone-ethyl and S-(+)-carfentrazone was found to be degraded preferentially in the Jiangxi, Jilin and Anhui soils for the first time.

Simultaneous Enantiomeric Separation of Carfentrazone-Ethyl Herbicide and Its Hydrolysis Metabolite Carfentrazone by Cyclodextrin Electrokinetic Chromatography. Analysis of Agrochemical Products and a Degradation Study

“…In fact, pH can drastically affect the degradation stereoselectivity for some compounds [ 22 ]. All the above-mentioned shows that the results obtained in the present work are complementary to other previously obtained results using other techniques and other soils with different complexity showing the need of further research as stated in previous works [ 17 ].…”

“…Figure 5 also shows that degradation of carfentrazone-ethyl originated the appearance of carfentrazone peaks although to a less extent (around 7% from days 0 to 4 and 9.5% at the seventh day, percentages expressed as concentration of carfentrazone divided by the concentration of degraded carfentrazone-ethyl). The differences in the results obtained for sand (pH 6.4) and for soil (pH 9.0) samples could be due to the pH values for each sample and the same can be said for the non-stereoselective behaviour observed in this work when compared with previous works reporting a stereoselective degradation of carfentrazone-ethyl and carfentrazone in three kinds of soils with pH values ranging from 5.2 to 7.0 [ 17 ]. In fact, pH can drastically affect the degradation stereoselectivity for some compounds [ 22 ].…”

“…In the first work, they performed the simultaneous chiral separation of both compounds in 20 min by HPLC and with enantiomeric resolutions of 1.0 for carfentrazone and 3.2 for carfentrazone-ethyl [ 16 ]. In the second one, they studied the degradation of carfentrazone-ethyl and its metabolite in three different soils [ 17 ] using UPLC as the analytical separation technique (analysis time was 22.5 min). They concluded that R -(+)-carfentrazone-ethyl and S -(+)-carfentrazone were preferentially degraded, while the corresponding enantiomers were enriched.…”

“…They concluded that R -(+)-carfentrazone-ethyl and S -(+)-carfentrazone were preferentially degraded, while the corresponding enantiomers were enriched. In both works they used MS/MS as a detector and worked at a temperature of 35 °C [ 16 , 17 ].…”