HCN emission by a Polydesmid Millipede Detected Remotely by Reactive Adsorption on Gold Nanoparticles Followed by Laser Desorption/Ionization Mass Spectrometry (LDI-MS)

HCN emission by a Polydesmid Millipede Detected Remotely by Reactive Adsorption on Gold Nanoparticles Followed by Laser Desorption/Ionization Mass Spectrometry (LDI-MS)
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通过金纳米颗粒上的反应吸附和激光解吸/电离质谱 (LDI-MS) 远程检测多粒千足虫的 HCN 发射

DOI:
10.1007/s10886-020-01177-3
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发表时间:
2020
影响因子:
2.3
通讯作者:
Attygalle, Athula B.
Attygalle, Athula B.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Pavlov, Julius;Xu, Sihang;Will, Kipling;Weary, Brandt;Attygalle, Athula B.

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氢氰酸(HCN)是千足虫化学武库中一种众所周知的防御性异激素。利用激光解吸/电离-质谱法(LDI-MS)对旧金山湾区常见千足虫成年xystocheir dissecta(Wood, 1867)的顶空蒸汽中HCN的存在进行了追踪。为了实现这一目标,笼养的活千足虫周围的顶空蒸汽被允许被动地扩散到距离发射源不同距离的金纳米颗粒(AuNP)沉积物上。采用355 nm激光辐照去除含有AuNP沉积物的不锈钢板。用飞行时间质谱法检测了以这种方式产生的气体离子。在atm/z249中检测到Au(CN)2 -络合物阴离子的质谱峰强度与残留Au -信号(m/z197)的质谱峰强度进行了比较。使用这种方法,可以在距离源50厘米远的地方检测到活千足虫产生的HCN蒸气。此外,加入H2O2作为在AuNP矿床中发生的金氰化反应的内氧源,显著提高了检测灵敏度。使用改进的h2o2加成程序,现在可以在距离源80 cm处检测到HCN。此外,我们发现Au(CN)2−/Au−信号的强度比随着与发射源距离的增加而减小,遵循菲克扩散定律预测的指数衰减分布。图形抽象
Hydrocyanic acid (HCN) is a well-known defensive allomone in the chemical arsenal of millipedes in the order Polydesmida. The presence of HCN in the headspace vapor of adultXystocheir dissecta(Wood, 1867), a common millipede from the San Francisco Bay Area, was traced by laser desorption/ionization-mass spectrometry (LDI-MS). To accomplish this, the headspace vapor surrounding caged, live millipedes was allowed to diffuse passively over gold-nanoparticle (AuNP) deposits placed at various distances from the emitting source. The stainless steel plates with AuNP deposits were removed and irradiated by a 355-nm laser. The gaseous ions generated in this way were detected by time-of-flight mass spectrometry. The intensity of the mass spectrometric peak detected atm/z249 for the Au(CN)2−complex anion was compared to that of the residual Au−signal (m/z197). Using this procedure, HCN vapors produced by the live millipedes could be detected up to 50 cm away from the source. Furthermore, the addition of H2O2, as an internal oxygen source for the gold cyanidation reaction that takes place in the AuNP deposits, significantly increased the detection sensitivity. Using the modified H2O2addition procedure, HCN could now be detected at 80 cm from the source. Moreover, we found a decreasing intensity ratio of the Au(CN)2−/Au−signals as the distance from the emitting source increased, following an exponential-decay distribution as predicted by Fick’s law of diffusion.Graphical abstract
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