Agricultural Research Division of IANR


Date of this Version



Penfield, Kevin, Young, Bryan, Young, Julie, Kruger, Greg, Henry, Ryan, and Lindner, Greg, “Physical and Biological Effects of Modified Polysorbate 20,” Pesticide Formulation and Delivery Systems: 34th Volume, Translating Basic Science into Products, STP 1579, Yasmith Bernal, Ed., pp. 76–93, doi:10.1520/STP157920130188, ASTM International, West Conshohocken, PA 2015.


Copyright 2015 by ASTM International. Used by permission.


Three experimental polyoxyethylene sorbitan monolaurate derivatives were synthesized with molecular fingerprinting techniques applied to experimental materials, confirming the target compounds had been produced. Chemical property measurements were compiled that aligned with theoretical predictions and physical property measurements confirmed their intentional differences yielded the anticipated changes in surfactant behavior. Imidacloprid uptake data confirmed penetration of leaf cuticles was enhanced in the presence of polyoxyethylene sorbitan monolaurates with several experimental materials providing uptake equivalent to reference material. Select materials were included in field and greenhouse trials where observations included good biological response with a range of individual herbicides as well as improved control of volunteer glyphosate tolerant corn with mixtures of glyphosate and clethodim over the control nonionic surfactant adjuvant when applied as a tank-added adjuvant. Antagonism of annual grass control was not observed.