STP1328

    Triton X-45: A Unique Effect on Growth Regulator Sorption by and Penetration of Isolated Plant Cuticles

    Published: Jan 1997


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    Abstract

    A unique effect of the polyethoxylated (average 5 ethylene oxide units, EO 5) octylphenol surfactant, Triton X-45 (TX-45), on the sorption and penetration of 2- (1-naphthyl) [1-14C] acetic acid (NAA) by and through enzymatically isolated tomato fruit cuticular membranes (CM) is described. TX-45 induced an unusually marked increase in cuticular sorption (55% greater than control) of NAA relative to Triton X surfactants of lower and higher EO content. This marked enhancement of NAA sorption was associated with epicuticular and cuticular waxes, for on removal of waxes, the TX-45 — mediated increase in sorption was lost. Surprisingly, a different lot of TX-45 failed to produce similar results. Evaluation of eight lots of TX-45 (0.1 % w/v) revealed that three produced no enhancement while five increased NAA sorption. A TX-45 lot that enhanced NAA sorption also increased NAA transcuticular penetration of isolated tomato fruit CM in a finite-dose diffusion system. Again, the CM waxes played a critical role. Based on capillary gas-liquid chromatography, no obvious differences were found in the ethoxymer profile of selected nonenhancing and enhancing TX-45 surfactants that could be related to performance.

    Keywords:

    cuticular penetration, epicuticular waxes, cuticular waxes, naphthylacetic acid, sorption, finite-dose, surfactants


    Author Information:

    Fader, RG
    Research Assistant, Michigan State University, East Lansing, MI

    Bukovac, MJ
    Professor, Michigan State University, East Lansing, MI


    Paper ID: STP13851S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP13851S


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