利用二次离子质谱成像和深度剖面分析小麦叶片中农用化学品的渗透。

IF 3.8 2区 化学 Q1 BIOCHEMICAL RESEARCH METHODS
Akhila Ajith, Sadia Sheraz, Aline Xavier de Souza, Drupad K Trivedi, Jean-Yves Mugnier, Giles N Johnson, Phillip J Milnes, Nicholas P Lockyer
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引用次数: 0

摘要

农用化学品的叶面施用首先由疏水角质层处理,然后由亲水表皮处理。了解农药通过这些层的运动和分布在农用化学品的研究和开发过程中至关重要。目前,没有一种技术能够在不对叶子进行化学或物理处理的情况下提供有效成分穿透叶片表层的结论性答案。现代飞行时间二次离子质谱(ToF-SIMS)技术的进步提供了必要的深度,空间和质量分辨率,以精确和相对简单的样品制备探测这个复杂的感兴趣领域。在这项工作中,我们描述了一个系统的ToF-SIMS工作流程,以全面了解应用的农用化学品通过表面蜡和大部分叶子的叶片运动。为了更好地了解杀菌剂氮唑菌酯在小麦幼叶中的流动性,研究人员将深度剖面实验与农化小麦叶片的横截面成像相结合。进行了广泛的测试,以优化分析条件和样品制备策略,最适合本工作中描述的实验。选择由水团簇组成的气团离子束进行分析。采用冻干叶片进行深度剖面实验,采用纸带切片进行叶片横切面成像。与ToF-SIMS平行的叶片切片也用基质辅助激光解吸电离质谱成像(MALDI-MSI)成像。施用时,偶氮嘧菌酯在叶片横截面上迅速移动,早在施用后24小时就在叶片中观察到,并持续1周。在比较叶肉区和维管束的强度时,两个时间点叶肉中氮嘧菌酯含量都较高,在第1周时差异较大。所获得的结果与MALDI在类似样本上进行的研究和已有的文献相证实。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Resolving agrochemical penetration in wheat leaves with secondary ion mass spectrometry imaging and depth profiling.

The foliar application of an agrochemical is first encountered by the hydrophobic cuticle and then the hydrophilic epidermis of the leaf. Understanding the movement and distribution of pesticides through these layers is vital in the research and development process of agrochemicals. Currently, no technique provides conclusive answers on active ingredient penetration through the leaf surface layers without chemical or physical treatment of the leaves. The advancements in modern time-of-flight secondary ion mass spectrometry (ToF-SIMS) technologies provide the necessary depth, spatial, and mass resolution to probe this complex area of interest with precision and relatively simple sample preparation. In this work, we describe a systematic ToF-SIMS workflow to comprehensively understand the foliar movement of an applied agrochemical through the surface waxes and in the bulk of the leaf. A combination of depth profiling experiments along with cross-section imaging of agrochemical-applied wheat leaves was used to better understand the mobility of a fungicide, azoxystrobin, in young wheat leaves. Extensive testing was done to optimise the analytical conditions and sample preparation strategies best suited for the experiments described in this work. A gas cluster ion beam composed of water clusters was selected for analysis. Freeze-dried leaves were used for depth profile experiments, while tape-sectioned leaf cross-sections were used for imaging. Parallel leaf sections to those taken for ToF-SIMS were also imaged with matrix-assisted laser desorption ionisation mass spectrometry imaging (MALDI-MSI). When applied, azoxystrobin moved rapidly across the leaf cross-section, being observed in the leaves as early as 24 h after application and persisting for 1 week. When comparing the intensity in the mesophyll region to that of the vascular bundle, more azoxystrobin content was observed in the mesophyll at both time points, with greater disparity observed at 1 week. The results obtained were corroborated with the MALDI study done on similar samples and with pre-existing literature.

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来源期刊
CiteScore
8.00
自引率
4.70%
发文量
638
审稿时长
2.1 months
期刊介绍: Analytical and Bioanalytical Chemistry’s mission is the rapid publication of excellent and high-impact research articles on fundamental and applied topics of analytical and bioanalytical measurement science. Its scope is broad, and ranges from novel measurement platforms and their characterization to multidisciplinary approaches that effectively address important scientific problems. The Editors encourage submissions presenting innovative analytical research in concept, instrumentation, methods, and/or applications, including: mass spectrometry, spectroscopy, and electroanalysis; advanced separations; analytical strategies in “-omics” and imaging, bioanalysis, and sampling; miniaturized devices, medical diagnostics, sensors; analytical characterization of nano- and biomaterials; chemometrics and advanced data analysis.
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