[Peptides analysis in digested edible bird's nest by HPLC-MS]

Area of Science:

• Biochemistry
• Proteomics
• Food Science

Context:

• Edible bird's nest (EBN) is rich in glycoproteins, but their complex glycosylation poses challenges for analysis.
• Glycosylation heterogeneity leads to variations in molecular weight, complicating protein separation and characterization.
• Understanding EBN protein composition is crucial for its nutritional and medicinal applications.

Purpose:

• To develop and validate a robust strategy for the comprehensive characterization of proteins in edible bird's nest.
• To overcome the analytical challenges posed by glycoprotein inhomogeneity in EBN.
• To identify and analyze peptides derived from EBN proteins.

Summary:

• Proteins were extracted from EBN using multiple extraction steps.
• Enzymatic digestion with PNgase F (for deglycosylation) and trypsin was performed.
• The resulting peptides were separated by High-Performance Liquid Chromatography (HPLC) and identified using tandem mass spectrometry (MS/MS).
• Over 79% of total EBN protein was extracted, and more than 20 peptide species were identified, showing similarity to known proteins.

Impact:

• The study demonstrates that deglycosylation, tryptic digestion, and HPLC-MS/MS is a suitable method for characterizing EBN proteins.
• This approach provides a foundation for further research into the specific functions and benefits of EBN glycoproteins.
• The findings contribute to the quality control and authentication of edible bird's nest products.