The Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Krakow, Poland.
Faculty of Chemical Engineering and Technology, Institute of Organic Chemistry and Technology, Cracow University of Technology, 31-155 Krakow, Poland.
Molecules. 2022 May 28;27(11):3480. doi: 10.3390/molecules27113480.
Bio-based nanoemulsions are part of green pest management for sustainable agriculture. This study assessed the physicochemical properties and the herbicidal activities of the peppermint essential oil nanoemulsions (PNs) in concentrations 1.0-10% stabilized by Eco-Polysorbate 80 on germinating seeds and young plants of maize and barnyard grass. Based on the design of experiment (DOE) results, the final nanoemulsion formulations were obtained with 1, 1.5, 2, and 5% of essential oil concentration. Biological analyses were conducted to select the most promising sample for selective control of barnyard grass in maize. Seedlings growing in the presence of PNs displayed an overall inhibition of metabolism, as expressed by the calorimetric analyses, which could result from significant differences in both content and composition of carbohydrates. Concentration-response sub estimation showed that leaf-sprayed concentration of PN causing 10% of maize damage is equal to 2.2%, whereas doses causing 50% and 90% of barnyard grass damage are 1.1% and 1.7%, respectively. Plants sprayed with PN at 5% or 10% concentration caused significant drops in relative water content in leaves and Chlorophyll fluorescence 72 h after spraying. In summary, peppermint nanoemulsion with Eco-Polysorbate 80 at 2% concentration is a perspective preparation for selective control of barnyard grass in maize. It should be analyzed further in controlled and field conditions.
生物基纳米乳液是可持续农业绿色害虫管理的一部分。本研究评估了薄荷精油纳米乳液（PNs）在 1.0-10%浓度下的理化性质和除草活性，这些纳米乳液由 Eco-Polysorbate 80 稳定，用于萌发的玉米和稗草种子和幼苗。基于实验设计（DOE）结果，最终获得了含有 1%、1.5%、2%和 5%精油浓度的纳米乳液配方。进行了生物分析，以选择最有前途的样品用于选择性控制玉米中的稗草。在 PN 存在下生长的幼苗表现出代谢的总体抑制，如量热分析所表达的，这可能是由于碳水化合物的含量和组成存在显著差异。浓度-反应子估计表明，导致玉米损伤 10%的叶喷 PN 浓度等于 2.2%，而导致稗草损伤 50%和 90%的剂量分别为 1.1%和 1.7%。在叶喷 5%或 10%浓度的 PN 后 72 小时，叶片的相对水含量和叶绿素荧光显著下降。总之，含有 Eco-Polysorbate 80 的 2%浓度的薄荷纳米乳液是一种有前途的用于选择性控制玉米中稗草的制剂。应在控制和田间条件下进一步分析。
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