Langlet Rozenn, Valentin Romain, Morard Marie, Raynaud Christine Delgado
Laboratoire de Chimie Agro-Industrielle (LCA), INRAE, Toulouse INP, Université de Toulouse, 31030 Toulouse, France.
Bois Valor-OLMIX, 13 Rue Jean Mermoz, 81160 Saint-Juéry, France.
Molecules. 2024 Dec 5;29(23):5750. doi: 10.3390/molecules29235750.
Seed film-coatings used for seed treatment often contain microplastics which must be replaced. The objective of this study is to analyze the influence of substitutes (maltodextrin, waxy maize glucose syrup (WMGS), methylcellulose, tragacanth gum (TG), arabic gum (AG), polyvinyl alcohol (PVA), ethoxylated rapeseed oil (ERO)), and xanthan gum as a thickener on the stability of a seed film-coating via Static Multiple Light Scattering (SMLS) technology. The results demonstrate that the incorporation of each polymer results in an increase in the quantity of particles migrating from the supernatant phase, but a concomitant decrease in their sedimentation rate and in the thickness of the supernatant phase (e). Furthermore, the redispersion capacity () of the particles in the seed film-coating is also decreased after the introduction of each polymer, potentially due to their adsorption to the particles. The impact of the thickener is contingent upon the specific polymer employed. Its incorporation reduces the number of particles migrating from the supernatant phase and their sedimentation rate for all of the polymers studied except AG and ERO. However, it reduces e for all seed film-coatings. Depending on the substitutes, thickener incorporation either improves (WMGS, maltodextrin, AG) or deteriorates (TG, PVA, ERO) . The formulation containing tragacanth gum shows a redispersing capacity with ≤ 1. This study introduces a novel analytical criterion, the redispersion capacity , which can be employed to characterize dispersed systems.
用于种子处理的种衣剂通常含有必须被替代的微塑料。本研究的目的是通过静态多重光散射（SMLS）技术分析替代物（麦芽糊精、糯玉米葡萄糖浆（WMGS）、甲基纤维素、刺梧桐树胶（TG）、阿拉伯胶（AG）、聚乙烯醇（PVA）、乙氧基化菜籽油（ERO））以及作为增稠剂的黄原胶对种衣剂稳定性的影响。结果表明，每种聚合物的加入都会导致从上清液相迁移的颗粒数量增加，但其沉降速率和上清液相厚度（e）会随之降低。此外，引入每种聚合物后，种衣剂中颗粒的再分散能力（）也会降低，这可能是由于它们吸附在颗粒上。增稠剂的影响取决于所使用的特定聚合物。除AG和ERO外，对于所有研究的聚合物，其加入都会减少从上清液相迁移的颗粒数量及其沉降速率。然而，它会降低所有种衣剂的e值。根据替代物的不同，加入增稠剂要么会改善（WMGS、麦芽糊精、AG）要么会恶化（TG、PVA、ERO）。含有刺梧桐树胶的配方显示再分散能力≤1。本研究引入了一种新的分析标准——再分散能力，可用于表征分散体系。
