title: Competitive sorption-desorption behavior of triazine herbicides with plant cuticular fractions.
abstract: Sorption interactions of plant cuticular matter with organic compounds are not yet fully understood. The objective of this study was to examine the competitive sorption-desorption interactions of the triazine herbicides (atrazine and ametryn) with cuticular fractions isolated from tomato fruits and leaves of Agave americana. The 13C NMR data suggest a rubber-like nature for the cutin. This biopolymer exhibited reversible and noncompetitive sorption. Enhanced desorption of atrazine was recorded in the bi-solute system with bulk and dewaxed A. americana cuticles. 13C NMR analyses of these samples suggested that the sorbed competitor ametryn facilitated a physical phase transition of rigid paraffinic sorption domain to mobile and flexible domain during sorption process. We suggest that the different sorption-desorption behavior obtained for the two cuticles is related to the higher content of waxes (14% vs 2.6%) and lower content of cutin (46% vs 75%) in the A. americana versus tomato fruit cuticle.
authors.affiliation: Department of Soil and Water Sciences, The Hebrew University of Jerusalem, PO Box 12, Rehovot 76100, Israel.
authors.forename: Michal
authors.initials: M
authors.lastname: Shechter
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
authors.forename: Frank-Dieter
authors.initials: FD
authors.lastname: Kopinke
authors.forename: Benny
authors.initials: B
authors.lastname: Chefetz
mesh_terms: D000042:Absorption; D027882:Agave / Q000378:metabolism*; D001280:Atrazine / Q000378:metabolism; D001667:Binding, Competitive; D005638:Fruit / Q000378:metabolism; D006540:Herbicides / Q000378:metabolism*; D018551:Solanum lycopersicum / Q000378:metabolism*; D008563:Membrane Lipids / Q000032:analysis; D018515:Plant Leaves / Q000378:metabolism; D014227:Triazines / Q000378:metabolism*
chemical_list: D006540:Herbicides; D008563:Membrane Lipids; D014227:Triazines; C100057:ametryne; C000521:cutin; D001280:Atrazine