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Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture

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Using Static Multiple Light Scattering to Develop Microplastic-Free Seed Film-Coating Formulations.

Rozenn Langlet^1,2, Romain Valentin¹, Marie Morard²

¹Laboratoire de Chimie Agro-Industrielle (LCA), INRAE, Toulouse INP, Université de Toulouse, 31030 Toulouse, France.

Molecules (Basel, Switzerland)

|December 17, 2024

Summary

This summary is machine-generated.

Researchers evaluated microplastic substitutes in seed film-coatings, finding that while polymers increased particle migration, they reduced sedimentation and improved redispersion. Xanthan gum

Keywords:

microplastics seed film-coatings static multiple light scattering (SMLS)

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Area of Science:

Agricultural Science
Materials Science
Colloid and Surface Chemistry

Background:

Seed film-coatings commonly utilize microplastics, necessitating sustainable alternatives.
Evaluating the stability and performance of novel seed film-coating formulations is crucial for agricultural applications.

Purpose of the Study:

To assess the impact of various polymer substitutes on seed film-coating stability.
To investigate the role of xanthan gum as a thickener in these formulations.
To introduce and validate a new metric, redispersion capacity (C), for characterizing dispersed systems.

Main Methods:

Static Multiple Light Scattering (SMLS) technology was employed to analyze seed film-coating stability.
Key parameters measured included particle migration, sedimentation rate, supernatant phase thickness (e_c), and redispersion capacity (C).
Multiple polymer substitutes (maltodextrin, WMGS, methylcellulose, TG, AG, PVA, ERO) and xanthan gum were tested.

Main Results:

All tested polymers increased particle migration but decreased sedimentation rates and supernatant thickness (e_c).
Polymer incorporation generally reduced particle redispersion capacity (C), likely due to adsorption.
Xanthan gum's effect varied; it reduced particle migration and sedimentation for most polymers but impacted e_c universally. It improved C for WMGS, maltodextrin, and AG, but worsened it for TG, PVA, and ERO.

Conclusions:

The study highlights the complex effects of polymer substitutes and thickeners on seed film-coating stability.
The novel redispersion capacity (C) metric effectively characterizes the stability of these dispersed systems.
Formulation optimization is critical, as demonstrated by the varying performance of substitutes and the impact of tragacanth gum (TG) showing C ≤ 1.