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Appraising soil components governing the sorption of the monoterpene carvone in agricultural soils

AutorGámiz, B. ; Hermosín, M.C. ; Celis, R.
Fecha de publicación17-jul-2017
EditorSociedad Española de Arcillas
CitaciónScientific Research Abstracts Vol. 7, p. 283 (2017)
ResumenThere is a worldwide trend to decrease the application of synthetic chemicals against pests. This trend is a consequence of the manifested environmental contamination and gradual pest resistance problems associated with the application of traditional pesticides. In this regard, the use of new pesticide active ingredients based on natural products has been proposed to increase the sustainability of agricultural activity [1]. For instance, some secondary metabolites in plants can be the source of inspiration to formulate new biopesticides. Such is the case of several monoterpenes, including carvone. Carvone exists in nature as two enantiomers, R-carvone and S-carvone, both with pesticidal properties. R-carvone has been proposed for use as an insect repellent and S-carvone as a plant growth regulator. Herbicidal properties have also been attributed to R-carvone [2]. In this work, the sorption of carvone enantiomers in six agricultural soils was assessed to determine the relationship between sorption and soil properties. Several model sorbents were also used to establish the role of mineral and organic colloidal components in carvone sorption. The results for this preliminary study could help to elucidate the behavior of these natural compounds in soil and could also be valuable to design new carvone-based pesticide formulations by supporting the active ingredient on clay minerals. The batch sorption technique was used as a conventional method to assess the sorption of RS-carvone on the different agricultural soils selected, mainly characterized by their relatively low organic carbon content and different clay content and mineralogy. The model sorbents chosen to correlate the sorption observed in soils were three reference phyllosilicates (kaolinite, illite, and montmorillonite), a lab-synthesized Fe-oxide (ferrihydrite) and an olive-mill waste (OMW), the latter as representative of natural organic matter. The analysis of carvone was conducted using chiral high performance liquid chromatography (HPLC) to assess the individual sorptive behavior of the R- and S-carvone enantiomers. Distribution coefficients, Kd (L kg-1), were calculated to express carvone sorption.
Overall, the sorption of carvone was relatively low, with Kd values ranging between 0.23 and 1.26 L kg-1, and was non-enantioselective, meaning that both enantiomers were sorbed equally on the soils. Correlations showed that organic matter was the most important component determining the sorption of carvone on the soils (r = 0.917, p < 0.05), which was supported by the higher sorption of carvone on OMW (Kd = 26 L kg-1) compared to the mineral model sorbents (Kd < 6.3 L kg-1). There was no positive correlation (p > 0.05) between carvone sorption on soils and the clay content, our results showed that the extent of sorption was affected by the mineralogy of the clay fraction. Thereby, relevant affinity of carvone towards expandable montmorillonite in contrast to kaolinite and illite was observed. Ferrihydrite exhibited similar sorption properties respect to montmorillonite. The sorption followed the order: montmorillonite > ferrihydrite > illite > kaolinite. Our results indicated that the organic carbon content can be a good predictor for carvone sorption in the soil. However, clay mineralogy, specifically the presence of (expandable) smectites, could also be significant for the sorption of this organic compound in soils with low organic carbon content. Furthermore, the affinity of carvone towards smectitic minerals suggests the possibility of using these materials for the preparation of carvone formulations based on natural or modified clays as carriers. [1] Cantrell C.L., Dayan F.E., Duke S.O. (2012). Natural products as sources for new pesticides. Journal of the Natural Products, 75, 1231-1242. [2] De Martino L., Mancini E., Rolim de Almeida L.F., de Feo V. (2010). The antigerminative activity of twenty-seven monoterpenes. Molecules, 15, 6630-6637
DescripciónPóster presentado en el XVI International Clay Conference from the Oceans to Space Granada, Spain, July 17-21, 2017
Versión del editorhttp://www.scientevents.com/scientific-research-abstracts/
URIhttp://hdl.handle.net/10261/154390
E-ISSN2464-9147
Aparece en las colecciones: (IRNAS) Comunicaciones congresos
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