Clean Energy Research Center, The University of Yamanashi, Takeda 4-3-11, Kofu, Yamanashi, 400-8511, Japan.
Rapid Commun Mass Spectrom. 2010 Aug 30;24(16):2431-8. doi: 10.1002/rcm.4660.
Electrospray droplet impact (EDI)/secondary ion mass spectrometry (SIMS) is a new desorption/ionization technique for mass spectrometry in which highly charged water clusters produced from atmospheric-pressure electrospray are accelerated in vacuum by several kV and impact on the sample deposited on the metal substrate. In this study, we applied EDI/SIMS directly to fruits, such as bananas, strawberries, grapes and apples. The major components in the fruits--fructose, glucose, sucrose and organic acids--could be observed with strong signal intensities. EDI/SIMS was also applied to the analysis of different regions of strawberries and apples. Compared with matrix-assisted laser desorption/ionization (MALDI), ion signals with lower background signals could be obtained, particularly for the low molecular weight analytes.
电喷雾液滴冲击（EDI）/二次离子质谱（SIMS）是一种新的解吸/电离技术，用于大气压电喷雾产生的高电荷水簇在真空中加速到几千伏并冲击沉积在金属基底上的样品的质谱分析。在这项研究中，我们直接将 EDI/SIMS 应用于水果，如香蕉、草莓、葡萄和苹果。水果中的主要成分——果糖、葡萄糖、蔗糖和有机酸——可以用很强的信号强度观察到。EDI/SIMS 也被应用于草莓和苹果不同区域的分析。与基质辅助激光解吸/电离（MALDI）相比，可以获得背景信号较低的离子信号，特别是对于低分子量分析物。
