Temple University MASS SPECTROMETRY INTRODUCTION Ilyana Mushaeva and Amber Moscato Department of Electrical and Computer Engineering Temple University.

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Presentation transcript:

Temple University MASS SPECTROMETRY INTRODUCTION Ilyana Mushaeva and Amber Moscato Department of Electrical and Computer Engineering Temple University

Temple University: Slide 1 Mass spectroscopy is an out of date term for mass spectrometry. Spectroscopy describes measurements involving electromagnetic radiation, such as infrared spectroscopy or ultraviolet spectroscopy. Mass spectrometry involves molecules being analyzed by their fragmentation patterns, not by their interaction with EM radiation. The reason the term mass spectroscopy was used is that the fragmentation patterns of the molecules were originally recorded on a photographic plate, which involved electromagnetic radiation. However, modern mass spectrometers do not use this output method, and so the term mass spectroscopy is no longer correct. Spectrometry vs. Spectroscopy

Temple University: Slide 2 What is Mass Spectrometry? Measures characteristics of a molecule by converting into ions. A sample is first ionized (proteins in this case). Specific ions are separated according to their mass-to-charge ratio (m/z). Each ion is counted using a detector. Proteins are a long sequence of 20 Amino Acids Ionization removes charged particles from the molecule. The molecular ion and fragments are formed.

Temple University: Slide 3 Mass Spectrum Each “bar” represents an ion with specific m/z and an abundance. The highest mass ion is the Molecular Ion. The Base Peak is the most abundant ion, assigned 100%. All other fragments are percentages of the Base Peak. y-axis: signal intensity of ions x-axis: m/z Here are simple examples:

Temple University: Slide 4 Tandem Mass Spectrometry MS/MS Multiple steps of Mass Spectrometry selection with some form of fragmentation occurring in between the stages. Precursor Ion Scan: monitoring for a specific loss from the precursor ion. The first and second mass analyzers can scan across the spectrum as partitioned by a user defined m/z value. The experiment is used to detect specific parts within unknown molecules. The first scanned is considered the Precursor Ion The second scanned is considered the Product Ion Can be performed in either time or space. For our case, we are dealing with time, which utilizes an Ion Trap (counts/second).

Temple University: Slide 5 Scan 2221 – precursor to 2222 The Data

Temple University: Slide 6 ms/ms fragment scan 2222 of mass The Data

Temple University: Slide 7 Brief Bibliography D. Anastassiou, Genomic Signal Processing, IEEE Signal Processing Magazine, “Introduction to Mass Spectrometry,” available at P.P. Vaidyanathan and Byung-Jun Yoon, The role of signal-processing concepts in genomics and proteomics, Journal of the Franklin Institute, 2004.