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Sorption in reconstituted waxes of homologous series of alcohol ethoxylates and n-alkyl esters and their effects on the mobility of 2,4-dichlorophenoxybutyric acid.
Pest Manag Sci 2005; 61(4):383-9PM

Abstract

Equilibrium sorption of n-alkyl esters (dimethyl suberate, diethyl suberate, diethyl sebacate, dibutyl suberate and dibutyl sebacate) and monodisperse alcohol ethoxylates (diethylene glycol, tetraethylene glycol, pentaethylene glycol, hexaethylene glycol and octaethylene glycol monododecyl ether) between the reconstituted cuticular waxes of Stephanotis floribunda Brongn (Madagascar jasmine) or Hordeum vulgare L (barley) leaves and an external aqueous receptor solution was determined. Logarithms of the wax/receptor partition coefficient (K(wax/rec)) of the n-alkyl esters increased linearly with the number of C-atoms. With alcohol ethoxylates, log K(wax/rec) decreased linearly with the number of ethylene oxide units. For both groups of compounds, K(wax/rec) increased with increasing lipophilicity. The values of K(wax/rec) in Stephanotis wax were between 5 and 16 times higher than in barley wax. It is argued that this difference was due to different chemical composition and crystallinity of the waxes. Mobility of [14C]2,4-dichlorophenoxybutyric acid (2,4-DB) in reconstituted Stephanotis and barley wax was increased by a factor of 2-8 by both n-alkyl esters and alcohol ethoxylates. Effects on the mobility of 2,4-DB were linearly related to the internal concentrations of n-alkyl esters and alcohol ethoxylates in reconstituted Stephanotis or barley wax. At the same internal concentrations the effect of n-alkyl esters on the mobility of 2,4-DB in wax exceeded that of alcohol ethoxylates by between 1 and 2 orders of magnitude. Results are discussed in relation to formulating systemic pesticides.

Authors+Show Affiliations

Institute of Cellular and Molecular Botany (IZMB), Department of Ecophysiology, University of Bonn, Kirschallee 1, D-53115 Bonn, Germany.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15751010

Citation

Simánová, Eva, et al. "Sorption in Reconstituted Waxes of Homologous Series of Alcohol Ethoxylates and N-alkyl Esters and Their Effects On the Mobility of 2,4-dichlorophenoxybutyric Acid." Pest Management Science, vol. 61, no. 4, 2005, pp. 383-9.
Simánová E, Shi T, Schönherr J, et al. Sorption in reconstituted waxes of homologous series of alcohol ethoxylates and n-alkyl esters and their effects on the mobility of 2,4-dichlorophenoxybutyric acid. Pest Manag Sci. 2005;61(4):383-9.
Simánová, E., Shi, T., Schönherr, J., & Schreiber, L. (2005). Sorption in reconstituted waxes of homologous series of alcohol ethoxylates and n-alkyl esters and their effects on the mobility of 2,4-dichlorophenoxybutyric acid. Pest Management Science, 61(4), pp. 383-9.
Simánová E, et al. Sorption in Reconstituted Waxes of Homologous Series of Alcohol Ethoxylates and N-alkyl Esters and Their Effects On the Mobility of 2,4-dichlorophenoxybutyric Acid. Pest Manag Sci. 2005;61(4):383-9. PubMed PMID: 15751010.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sorption in reconstituted waxes of homologous series of alcohol ethoxylates and n-alkyl esters and their effects on the mobility of 2,4-dichlorophenoxybutyric acid. AU - Simánová,Eva, AU - Shi,Tuansheng, AU - Schönherr,Jörg, AU - Schreiber,Lukas, PY - 2005/3/8/pubmed PY - 2005/6/29/medline PY - 2005/3/8/entrez SP - 383 EP - 9 JF - Pest management science JO - Pest Manag. Sci. VL - 61 IS - 4 N2 - Equilibrium sorption of n-alkyl esters (dimethyl suberate, diethyl suberate, diethyl sebacate, dibutyl suberate and dibutyl sebacate) and monodisperse alcohol ethoxylates (diethylene glycol, tetraethylene glycol, pentaethylene glycol, hexaethylene glycol and octaethylene glycol monododecyl ether) between the reconstituted cuticular waxes of Stephanotis floribunda Brongn (Madagascar jasmine) or Hordeum vulgare L (barley) leaves and an external aqueous receptor solution was determined. Logarithms of the wax/receptor partition coefficient (K(wax/rec)) of the n-alkyl esters increased linearly with the number of C-atoms. With alcohol ethoxylates, log K(wax/rec) decreased linearly with the number of ethylene oxide units. For both groups of compounds, K(wax/rec) increased with increasing lipophilicity. The values of K(wax/rec) in Stephanotis wax were between 5 and 16 times higher than in barley wax. It is argued that this difference was due to different chemical composition and crystallinity of the waxes. Mobility of [14C]2,4-dichlorophenoxybutyric acid (2,4-DB) in reconstituted Stephanotis and barley wax was increased by a factor of 2-8 by both n-alkyl esters and alcohol ethoxylates. Effects on the mobility of 2,4-DB were linearly related to the internal concentrations of n-alkyl esters and alcohol ethoxylates in reconstituted Stephanotis or barley wax. At the same internal concentrations the effect of n-alkyl esters on the mobility of 2,4-DB in wax exceeded that of alcohol ethoxylates by between 1 and 2 orders of magnitude. Results are discussed in relation to formulating systemic pesticides. SN - 1526-498X UR - https://www.unboundmedicine.com/medline/citation/15751010/Sorption_in_reconstituted_waxes_of_homologous_series_of_alcohol_ethoxylates_and_n_alkyl_esters_and_their_effects_on_the_mobility_of_24_dichlorophenoxybutyric_acid_ L2 - https://doi.org/10.1002/ps.979 DB - PRIME DP - Unbound Medicine ER -