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A common proteomic sample preparation method, filter-aided sample preparation (FASP), can cause unintended formaldehyde modification. This side reaction reduces peptide and protein identification rates, impacting proteomic study results.

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Filter-aided sample preparation (FASP) is a widely used technique for efficient proteomic sample purification.
  • Spin filters are integral to the FASP method, but potential chemical interactions with samples are not always considered.

Purpose of the Study:

  • To identify and characterize an unknown +12 Da modification observed during FASP using Microcon spin filters.
  • To investigate the source of the modification and its impact on proteomic data quality.
  • To evaluate strategies for mitigating this side reaction and recommend optimal spin filter choices.

Main Methods:

  • Utilized mass spectrometry to detect and identify the +12 Da modification.
  • Investigated the chemical origin of the modification by analyzing spin filter components.
  • Quantified the impact of the modification on peptide and protein identification rates.
  • Assessed various pretreatment methods for spin filters.
  • Compared the performance of different spin filter brands.

Main Results:

  • Confirmed a +12 Da side modification during FASP, caused by formaldehyde released from Microcon spin filters.
  • This formaldehyde-induced modification resulted in a significant loss of 10.5% in peptide and 9.5% in protein identifications.
  • Evaluated pretreatment protocols to minimize the side reaction.
  • Recommended Nanosep spin filters as a preferred alternative for proteomic applications, particularly for amine-labeling studies.

Conclusions:

  • The formaldehyde released from certain spin filters during FASP introduces a significant artifact, negatively impacting proteomic identification.
  • Researchers should be aware of this potential modification and consider alternative filters or pretreatment methods.
  • Nanosep spin filters are recommended to minimize this artifact in proteomic studies.