Mass Spectrometry

NIST 11: What’s New and What Value Does it Offer? Part 2

NIST 11 (EPA/EPA/NIH Mass Spectral Database of Electron Ionization Data, GC Method/Retention Index Databases, A Database of Spectra Obtained Using MS/MS Techniques, v.2.0g of the NIST MS Search Program, MS Interpreter v.2, and AMDIS) What’s New...

NIST 11: What’s New and What Value Does it Offer? Part 1

The NIST 11 (National Institute of Standards and Technology) Mass Spectral Database, the successor to the NIST 08, is a fully evaluated collection of electron ionization (EI) Mass Spectra, which also includes a growing number of MS/MS Spectra and GC...

Peptide Sequencing with Electrospray LC/MS Part 2: Interpretation of a Simple Spectrum

In the previous MS Solutions we discussed MS/MS fragmentation of polypeptides, the types of ions formed, and the mechanism of their formation. In this part we will examine a tandem mass spectrum of a simple polypeptide and step through an...

Peptide Sequencing with Electrospray LC/MS Part 1: Ion Types and Nomenclature

One of the most significant and important applications for mass spectrometry is the sequencing of polypeptides by electrospray LC/MS. An error in the sequence or the substitution of one amino acid with another can completely alter the biological...

Molecular Weight and the Nominal Mass, Monoisotopic Mass and Average Molar Mass

This technical article explains the confusion resulting from molecular weight and the nominal mass, monoisotopic mass and average molar mass.

The Role of Isotope Peak Intensities Obtained Using Mass Spectrometry in Determining an Elemental Composition, Part 2

An illustrative example of the use of isotope peak ratios to determine an elemental composition.

The Role of Isotope Peak Intensities Obtained Using Mass Spectrometry in Determining an Elemental Composition, Part 1

This technical article comprises a discussion of the role of isotope peak intensities obtained using mass spectrometry in determining an elemental composition.

Quantitation in hyphenated chromatographic techniques

Mass spectrometry has long been a valuable quantitative tool used across many industries for numerous applications including food [1], beverage [2], pharma [3] and environmental analysis [4]. Its utility ranges from use as an alternative detector...

AMDIS – Developing Libraries

by Gary Mallard and O. David Sparkman

For AMDIS to be as effective as possible, it is essential to have high quality target libraries. These can either come from standards taken with the same instrument that the data is analysed on or from the...

AMDIS — Setting Up and Running a Deconvolution and Target Analysis: Part 3

by Gary Mallard and O. David Sparkman

In the first two parts of the discussion of setting up AMDIS the basics of running an analysis with retention index filtering as well as a simple analysis were discussed. In this final part of the set up...

AMDIS – Setting Up and Running a Deconvolution and Target Analysis – Part 2

by Gary Mallard and O. David Sparkman

In the last part of this AMDIS discussion, the setting up and running of a simple analysis was discussed. However, to take full advantage of AMDIS it is far better to make use not only of the mass spectral...

AMDIS: Setting Up and Running a Deconvolution and Target Analysis – Part 1

by Gary Mallard and O. David Sparkman

AMDIS is designed to do analysis for target compounds in a GC/MS data file. To do the analysis you need a completed data file (AMDIS reads most current and many older instrument formats as well as standard...

AMDIS – An Introduction to Extracting High-Quality Spectra from Complex GC/MS Data

by Gary Mallard and O. David Sparkman

The identification of components by GC/MS in complex mixtures has essentially two parts – extracting a spectrum that is due to a single component and then identifying the component, usually through a library...

Adjusting electrospray voltage for optimum results

An electrospray LC/MS interface consists of an enclosed, atmospheric pressure chamber whereby the HPLC effluent enters this chamber through a capillary tube. This is surrounded by a second, concentric tube through which a nebulizing gas is...

Dealing with Metal Adduct Ions in Electrospray: Part 2

Previously we discussed the fundamental issue of metal adduct ion formation in electrospray LC/MS including method development strategies for dealing with adduct ions. This article will examine a real-world application which employs these...

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