Advances in MALDI and Laser-Induced Soft Ionization Mass by Rainer Cramer

By Rainer Cramer

This ebook covers the state of the art of contemporary MALDI (matrix-assisted laser desorption/ionization) and its functions. New functions and enhancements within the MALDI box resembling biotyping, scientific analysis, forensic imaging, and ESI-like ion creation are coated intimately. extra issues contain MS imaging, biotyping/speciation and large-scale, high-speed MS pattern profiling, new tools in line with MALDI or MALDI-like pattern arrangements, and some great benefits of ESI to MALDI MS research. this is often an awesome ebook for graduate scholars and researchers within the box of bioanalytical sciences.

This publication also:

• Showcases new innovations and purposes in MALDI MS

• Demonstrates how MALDI is most appropriate to ESI (electrospray ionization)

• Illustrates the professionals and cons linked to biomarker discovery reports in scientific proteomics and a few of the program components, reminiscent of melanoma proteomics

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Extra resources for Advances in MALDI and Laser-Induced Soft Ionization Mass Spectrometry

Sample text

Even lower matrix background was observed by combining DMAN matrix (described in detail in Sects. 4) with 9-AA (Calvano et al. 2013). This binary matrix system was used for lipid fingerprinting of intact gram-positive (Lactobacillus sanfranciscensis) and gram-negative (Escherichia coli) bacteria. About 50 major membrane constituents could be identified comprising free fatty acids, mono-, di- and triglycerides, phospholipids, glycolipids, and cardiolipins Employing ‘Second Generation’ Matrices 27 with m/z values between 200 and 1600.

1 Chemicals As before ClCCA is available in matrix quality from Sigma-Aldrich. 2 Sample Preparation and Mass Spectrometry A volume of 1–3 μL of aqueous glycopeptide or glycan solution is spotted onto a polished steel target plate and allowed to dry at room temperature. Subsequently, 1 μL of ClCCA matrix solution (5 mg/mL in 50–70% ACN) is applied on top of each sample and allowed to dry. MALDI-TOF instruments with 355 and 337 nm lasers can be used in positive and negative ion mode. 1 Chemicals DMAN was purchased from Sigma-Aldrich.

Cramer Fig. 2 AP-UV-MALDI spectrum of [Val-5]-Angiotensin I using the glycerol/CHCA-based liquid matrix. A total of 500 fmol of the analyte was deposited on the target. 80) charged analyte ion species are observed signal response on the mass spectrometer. 3 Example Data Under the above described conditions we were able to acquire spectra of multiply charged [Val-5]-Angiotensin 1 (see Fig. 2). The analyte solution was spotted alongside with the glycerol/CHCA-based matrix solution as described previously.

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