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| - Competitive Sorption−Desorption Behavior of TriazineHerbicides with Plant Cuticular Fractions
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| - 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 thetriazine herbicides (atrazine and ametryn) with cuticular fractions isolated from tomato fruits and leavesof Agave americana. The 13C NMR data suggest a rubber-like nature for the cutin. This biopolymerexhibited reversible and noncompetitive sorption. Enhanced desorption of atrazine was recorded inthe bi-solute system with bulk and dewaxed A. americana cuticles. 13C NMR analyses of these samplessuggested that the sorbed competitor ametryn facilitated a physical phase transition of rigid paraffinicsorption domain to mobile and flexible domain during sorption process. We suggest that the differentsorption−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 fruitcuticle. Keywords: Plant cuticle; cutin; cutan; atrazine; NMR; sorption; desorption; glass transition temperature;paraffinic carbon
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