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Mass Spectrum: Interpretation01:24

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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Mass Spectrometry: Overview01:19

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Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Challenges in polysorbate characterization by mass spectrometry.

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|January 17, 2020
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Mass spectrometry techniques like MALDI-MS, LC/MS, GC/MS, and SFC/MS are crucial for characterizing complex polysorbates. These methods identify components, byproducts, and degradation species, aiding biopharmaceutical formulation stability studies.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Polymer Science

Background:

  • Polysorbates are widely used but possess complex compositions.
  • Understanding their composition is vital for various industries, especially biopharmaceuticals.
  • Residual byproducts and degradation species can impact product stability and efficacy.

Purpose of the Study:

  • To review and illustrate the application of various mass spectrometry techniques for polysorbate characterization.
  • To highlight the capabilities and limitations of techniques like MALDI-MS, LC/MS, GC/MS, and SFC/MS.
  • To demonstrate advanced methods for analyzing complex polysorbate molecules and their impact on formulation stability.

Main Methods:

  • Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) for detailed component analysis.
  • Liquid chromatography-mass spectrometry (LC/MS) and tandem mass spectrometry (LC/MS/MS) for high-resolution characterization.
  • Gas chromatography-mass spectrometry (GC/MS) and supercritical fluid chromatography-mass spectrometry (SFC/MS) for complementary analyses.

Main Results:

  • MALDI-MS effectively characterizes polysorbates, with matrix and cationization agent selection impacting results (e.g., Polysorbate 60).
  • Unique challenges in MALDI analysis of Polysorbate 80 were identified.
  • High-resolution LC/MS and LC/MS/MS provide advanced insights into complex polysorbate structures and their role in formulation stability.

Conclusions:

  • Mass spectrometry is indispensable for comprehensive polysorbate analysis, from basic components to trace impurities.
  • Advanced LC/MS techniques offer superior characterization of complex polysorbates like Polysorbate 80.
  • Accurate characterization of polysorbates is critical for ensuring the stability and quality of biopharmaceutical formulations.