Mechanisms of Cuticular Uptake of Xenobiotics into Living Plants:  Evaluation of a Logistic−Kinetic Penetration Model

The objective of this study was to determine whether a logistic−kinetic penetration model could be applied to whole plant uptake. Uptake over 24 h was determined for three model compounds, applied in the presence and absence of surfactants, into the leaves of two plant species. Data for two time int...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2006-04, Vol.54 (8), p.3025-3032
Main Authors: Forster, W. Alison, Zabkiewicz, Jerzy A, Riederer, Markus
Format: Article
Language:English
Subjects:
2,4-D
absorption
Biological and medical sciences
Carbon Radioisotopes
Chenopodium album
Chenopodium album - metabolism
deoxyglucose
droplets
epiconazole
Epoxy Compounds - metabolism
foliar spraying
foliar uptake
Food industries
Fundamental and applied biological sciences. Psychology
General aspects
Handling, storage, packaging, transport
Hedera - metabolism
Hedera helix
Kinetics
leaves
Logistic Models
logistic-kinetic penetration model
mathematical models
plant cuticle
Plants - metabolism
Reproducibility of Results
surfactants
triazole fungicides
Triazoles - metabolism
Watanabe model
xenobiotics
Xenobiotics - metabolism
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Summary:The objective of this study was to determine whether a logistic−kinetic penetration model could be applied to whole plant uptake. Uptake over 24 h was determined for three model compounds, applied in the presence and absence of surfactants, into the leaves of two plant species. Data for two time intervals were used in the model to predict uptake at intermediate intervals and compared with experimental results. Overall, the model fit the whole plant uptake data well. The study confirmed that an increase (or decrease) in active ingredient (ai) concentration or an increase in contact area will have no effect on the penetration rate factor, q, within the normal working concentration range. This enabled uptake to be predicted at different times for concentrations of ai not already studied, having first derived q for one concentration of the formulation of interest and having 24 h (maximum) uptake results for all formulations and concentrations of interest. The advantages of the models and equations described are that few variables are required, and they are simple to measure. Keywords: Cuticular uptake; dose; mechanisms; kinetics, rate, Chenopodium album; Hedera helix; triethylene glycol monododecyl ether; hexaethylene glycol monododecyl ether; trisiloxane ethoxylate
ISSN:0021-8561
1520-5118
DOI:10.1021/jf0528916