Elucidating Adhesion Behaviors and the Interfacial Interaction Mechanism between Plant Probiotics and Modified Bentonite Carriers,ACS Sustainable Chemistry & Engineering

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Elucidating Adhesion Behaviors and the Interfacial Interaction Mechanism between Plant Probiotics and Modified Bentonite Carriers
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-06-10 , DOI: 10.1021/acssuschemeng.1c01166
Tao Li _{1,

2} , Yanhui He ₂ , Xiongfang An ₁ , Chun Li ₃ , Zhansheng Wu _{1,

2}

Affiliation

Bentonite mineral can be used as the support carrier of microbial inoculant. The promising carrier should have excellent adsorption capacity and affinity for plant probiotics. However, the adhesion mechanisms and interface interaction underlying the bentonite carriers and plant probiotics remain uncertain. In this study, the interface interactions of two kinds of plant growth-promoting bacteria (Rs-2 and SL-44) and five different bentonite carriers were examined. The results indicated that the maximum bacteria adsorption capacity and affinity were obtained by hydrophobic stearic acid-modified bentonite (SA-BENT) owing to its attractive acid–base interaction as calculated by extended-DLVO theory. The stronger acid–base interaction between Rs-2 and the carriers promoted its adhesion, which may be attributed to its more hydrophobic surface structure acting as a broom to remove interfacial water. SL-44 had a stronger adsorption binding energy and smaller adsorption capacity since its EPS components (e.g., low polarity, aromatic lipophilic protein macromolecules) were preferentially absorbed and occupied absorption sites based on the fluorescence excitation–emission matrix (EEM) and normalized volume integral of the fluorescence region.

中文翻译：

阐明植物益生菌与改性膨润土载体之间的粘附行为和界面相互作用机制

膨润土矿物可作为微生物菌剂的载体。有前景的载体应该对植物益生菌具有优异的吸附能力和亲和力。然而，膨润土载体和植物益生菌的粘附机制和界面相互作用仍不确定。在这项研究中，研究了两种植物生长促进细菌（Rs-2 和 SL-44）和五种不同的膨润土载体的界面相互作用。结果表明，疏水性硬脂酸改性膨润土（SA-BENT）由于其有吸引力的酸碱相互作用（如扩展 DLVO 理论计算）获得了最大的细菌吸附能力和亲和力。Rs-2 与载体之间更强的酸碱相互作用促进了其粘附，这可能是由于其更疏水的表面结构充当扫帚去除界面水。SL-44 具有更强的吸附结合能和更小的吸附容量，因为其 EPS 组分（例如，低极性、芳香族亲脂性蛋白质大分子）基于荧光激发-发射矩阵（EEM）和归一化体积积分被优先吸收并占据吸收位点荧光区域。

更新日期：2021-06-21

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