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Investigating Long-Distance Transport of Perfluoroalkyl Acids in Wheat via a Split-Root Exposure Technique
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Organic Pollutant Penetration through Fruit Polyester Skin: A Modified Three-compartment Diffusion Model.

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This study reveals how plant cuticular membranes control organic pollutant penetration. A new three-compartment model accurately predicts phenanthrene uptake and transport, aiding environmental risk assessment.

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Area of Science:

  • Environmental Chemistry
  • Plant Biology
  • Chemical Engineering

Background:

  • The plant cuticular membrane (CM) is a crucial barrier against environmental stressors.
  • Understanding organic pollutant penetration through the CM is vital for environmental chemistry.
  • The specific roles of CM components in pollutant defense remain unclear.

Purpose of the Study:

  • To investigate the penetration characteristics of phenanthrene (PHE) through isolated fruit CM.
  • To differentiate PHE penetration across cuticular compartments: epicuticular waxes (EW), cuticle proper (CP), and cuticular layer (CL).
  • To develop and validate a modified penetration model for hydrophobic chemicals.

Main Methods:

  • Investigated unsteady-state penetration of phenanthrene through isolated fruit CM.
  • Analyzed PHE penetration across three distinct cuticular compartments (EW, CP, CL).
  • Developed and verified a modified three-compartment penetration model using apple, tomato, and potato CMs.

Main Results:

  • Phenanthrene penetration is driven by concentration gradients across cuticular compartments with varying lipophilic affinities.
  • The established three-compartment model accurately characterizes PHE uptake and transport.
  • The model shows broad applicability to hydrophobic chemicals and diverse plant species.

Conclusions:

  • The new three-compartment model enhances understanding of organic pollutant sorption and transport into plants.
  • This model offers improved accuracy and fewer limitations compared to existing models for semivolatile chemicals.
  • Findings contribute to assessing the role of plant polymeric lipids in pollutant interactions.