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Effects of temperature and concentration of the accelerators ethoxylated alcohols, diethyl suberate and tributyl phosphate on the mobility of [14C]2,4-dichlorophenoxy butyric acid in plant cuticles.
Pest Manag Sci 2001; 57(1):17-24PM

Abstract

Intrinsic activities of monodisperse ethoxylated dodecanols (MEDs), diethyl suberate (DESU) and tributyl phosphate (TBP) were investigated using Stephanotis floribunda leaf cuticular membranes (CMs) and [14C]2,4-dichlorophenoxy butyric acid (2,4-DB) as a model solute. When sorbed in cuticular membranes, MEDs, DESU and TBP increase solute mobility and are called accelerators for this reason. With MEDs, dose-effect curves (log mobility vs accelerator concentration) were linear but, with DESU and TBP, curves convex to the x axes were obtained that approached a maximum at 90 and 150 g kg-1, respectively. Accelerators increased the mobility of 2,4-DB in the CMs by 9- to 48-fold, and effects were larger at lower temperatures (range 15-30 degrees C). Activation energy for diffusion of 2,4-DB was 105 kJ mol-1, decreasing with increasing accelerator concentrations to 26 kJ mol-1 with DESU at 90 g kg-1 and 64 kJ mol-1 with TBP at 150 g kg-1. Thus, the intrinsic activity of DESU was much higher than that of TBP, which implies that, for a given effect, less DESU than TBP would be needed. MEDs were also very effective accelerators, lowering activation energies to 36 kJ mol-1. Data are discussed in relation to increasing rates of foliar penetration of active ingredients at low temperatures.

Authors+Show Affiliations

Institute of Vegetable and Fruit Science, University of Hannover, Am Steinberg 3, 31157 Sarstedt, Germany.No affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

11455627

Citation

Schönherr, J, et al. "Effects of Temperature and Concentration of the Accelerators Ethoxylated Alcohols, Diethyl Suberate and Tributyl Phosphate On the Mobility of [14C]2,4-dichlorophenoxy Butyric Acid in Plant Cuticles." Pest Management Science, vol. 57, no. 1, 2001, pp. 17-24.
Schönherr J, Schreiber L, Buchholz A. Effects of temperature and concentration of the accelerators ethoxylated alcohols, diethyl suberate and tributyl phosphate on the mobility of [14C]2,4-dichlorophenoxy butyric acid in plant cuticles. Pest Manag Sci. 2001;57(1):17-24.
Schönherr, J., Schreiber, L., & Buchholz, A. (2001). Effects of temperature and concentration of the accelerators ethoxylated alcohols, diethyl suberate and tributyl phosphate on the mobility of [14C]2,4-dichlorophenoxy butyric acid in plant cuticles. Pest Management Science, 57(1), pp. 17-24.
Schönherr J, Schreiber L, Buchholz A. Effects of Temperature and Concentration of the Accelerators Ethoxylated Alcohols, Diethyl Suberate and Tributyl Phosphate On the Mobility of [14C]2,4-dichlorophenoxy Butyric Acid in Plant Cuticles. Pest Manag Sci. 2001;57(1):17-24. PubMed PMID: 11455627.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of temperature and concentration of the accelerators ethoxylated alcohols, diethyl suberate and tributyl phosphate on the mobility of [14C]2,4-dichlorophenoxy butyric acid in plant cuticles. AU - Schönherr,J, AU - Schreiber,L, AU - Buchholz,A, PY - 2001/7/18/pubmed PY - 2001/8/24/medline PY - 2001/7/18/entrez SP - 17 EP - 24 JF - Pest management science JO - Pest Manag. Sci. VL - 57 IS - 1 N2 - Intrinsic activities of monodisperse ethoxylated dodecanols (MEDs), diethyl suberate (DESU) and tributyl phosphate (TBP) were investigated using Stephanotis floribunda leaf cuticular membranes (CMs) and [14C]2,4-dichlorophenoxy butyric acid (2,4-DB) as a model solute. When sorbed in cuticular membranes, MEDs, DESU and TBP increase solute mobility and are called accelerators for this reason. With MEDs, dose-effect curves (log mobility vs accelerator concentration) were linear but, with DESU and TBP, curves convex to the x axes were obtained that approached a maximum at 90 and 150 g kg-1, respectively. Accelerators increased the mobility of 2,4-DB in the CMs by 9- to 48-fold, and effects were larger at lower temperatures (range 15-30 degrees C). Activation energy for diffusion of 2,4-DB was 105 kJ mol-1, decreasing with increasing accelerator concentrations to 26 kJ mol-1 with DESU at 90 g kg-1 and 64 kJ mol-1 with TBP at 150 g kg-1. Thus, the intrinsic activity of DESU was much higher than that of TBP, which implies that, for a given effect, less DESU than TBP would be needed. MEDs were also very effective accelerators, lowering activation energies to 36 kJ mol-1. Data are discussed in relation to increasing rates of foliar penetration of active ingredients at low temperatures. SN - 1526-498X UR - https://www.unboundmedicine.com/medline/citation/11455627/Effects_of_temperature_and_concentration_of_the_accelerators_ethoxylated_alcohols_diethyl_suberate_and_tributyl_phosphate_on_the_mobility_of_[14C]24_dichlorophenoxy_butyric_acid_in_plant_cuticles_ L2 - https://doi.org/10.1002/1526-4998(200101)57:1<17::AID-PS266>3.0.CO;2-8 DB - PRIME DP - Unbound Medicine ER -