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Related Experiment Video

Updated: May 20, 2026

Sampling Human Indigenous Saliva Peptidome Using a Lollipop-Like Ultrafiltration Probe: Simplify and Enhance Peptide Detection for Clinical Mass Spectrometry
08:37

Sampling Human Indigenous Saliva Peptidome Using a Lollipop-Like Ultrafiltration Probe: Simplify and Enhance Peptide Detection for Clinical Mass Spectrometry

Published on: August 7, 2012

Toward a standardized saliva proteome analysis methodology.

Rui Vitorino1, Sofia Guedes, Bruno Manadas

  • 1QOPNA, Mass spectrometry center, Department of Chemistry, University of Aveiro, Portugal. rvitorino@ua.pt

Journal of Proteomics
|July 20, 2012
PubMed
Summary

Discarded saliva pellets contain significant salivary proteins and peptides. Optimized pre-treatment using urea/detergent with sonication enhances protein extraction and analysis, improving proteome and peptidome characterization.

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Published on: October 10, 2013

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Proteomics

Background:

  • Saliva sample pre-treatment, particularly centrifugation, is crucial for proteomic and peptidomic analysis.
  • The pellet fraction, often discarded, may contain valuable salivary components.
  • Current methods might not fully capture the salivary proteome and peptidome.

Purpose of the Study:

  • To evaluate the impact of saliva sample pre-treatment, specifically centrifugation, on salivary proteome and peptidome recovery.
  • To investigate methods for maximizing protein and peptide extraction from saliva.
  • To establish an optimized saliva pre-treatment protocol for comprehensive analysis.

Main Methods:

  • In-gel and off-gel electrophoresis techniques were employed.
  • Chaotropic/detergent treatment combined with sonication was used for sample disruption.
  • Centrifugation was performed to separate fractions.
  • Isobaric tag for relative and absolute quantitation (iTRAQ) analysis was utilized.
  • Acetone precipitation and acetonitrile/HCl solubilization were applied.

Main Results:

  • A substantial amount of salivary proteins was identified in the pellet fraction, typically discarded.
  • Urea/detergent treatment with sonication significantly disrupted salivary complexes, increasing protein extraction yields.
  • A novel procedure for salivary peptide extraction was developed, effective even after chaotropic/detergent treatment.
  • iTRAQ analysis revealed a higher number of distinct peptides and differential protein quantities after the optimized pre-treatment.

Conclusions:

  • The pellet fraction significantly contributes to the overall salivary proteome and should not be discarded.
  • A pre-treatment protocol involving urea/detergent and sonication is recommended for enhanced saliva proteome and peptidome analysis.
  • The described methods improve the comprehensive characterization of salivary proteins and peptides.