Mass Spectrometry Imaging of Small Molecules by Lin He

By Lin He

Mass Spectroscopy Imaging (MSI) has emerged as an allowing strategy to offer perception into the molecular entities inside of cells, tissues and whole-body samples and to appreciate inherent complexities inside of organic metabolomes. In Mass Spectrometry Imaging of Small Molecules: equipment and Protocols, specialists within the MSI box current innovations for second and 3D visualization and quantification of a big selection of small molecular species found in biologically appropriate samples. Chapters supply unique operational directions from pattern training to approach choice, from comparative quantification to structural identity and from information assortment to visualization of small molecule mapping in advanced samples. Written within the profitable Methods in Molecular Biology sequence layout, chapters comprise introductions to their respective themes, lists of the required fabrics and reagents, step by step, conveniently reproducible protocols and notes on troubleshooting and averting recognized pitfalls.

Authoritative and simply available, Mass Spectrometry Imaging of Small Molecules: tools and Protocols goals to deliver the speedily maturing tools of metabolic imaging to lifestyles technological know-how researchers and to reduce technical intimidation in adapting new technological systems in organic research.

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Extra info for Mass Spectrometry Imaging of Small Molecules

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This technique has been used extensively to study proteins, peptides, and lipids, and is becoming more common for studying small molecules such as endogenous metabolites. With matrix-assisted laser desorption/ionization (MALDI)-MSI, spatial distributions of multiple metabolites can be simultaneously detected within a biological tissue section. Herein, we present a method developed specifically for imaging metabolites in legume plant roots and root nodules which can be adapted for studying metabolites in other legume organs and even other biological tissue samples.

Measure the primary ion current using the Faraday cup provided on each sample holder. First of all, the primary ion beam is automatically centered in order to optimize the ion transmission through the ion optics. The ion current is then measured using the direct current (DC) mode. In this mode, the primary ions are neither bunched nor pulsed and all the primary ions (Bi+, Bi3+, Bi32+, Bi5+, Bi52+, Bi7+ …) are focused on the surface. Typical DC current between 12 and 15 nA is measured. 85 A), emission current (about 1 μA), suppressor voltage (about 1,000 V), extractor voltage (9,000 V), and lens source (about 3,000 V) are always reported in the laboratory book in order to check any voltage deviation related to any source problem.

Switch on the high voltage required for the analyzer and LMIG. 5. Start the LMIG using the batch command provided by the manufacturer. It allows an automatic switch-on of the LMIG source. The operation takes about 10 min. 6. Measure the primary ion current using the Faraday cup provided on each sample holder. First of all, the primary ion beam is automatically centered in order to optimize the ion transmission through the ion optics. The ion current is then measured using the direct current (DC) mode.

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