Hidden "Digestome": Current Analytical Approaches Provide Incomplete Peptide Inventories of Food Digests.
Maristella De CiccoGianfranco MamoneLuigia Di StasioPasquale FerrantiFrancesco AddeoGianluca PicarielloPublished in: Journal of agricultural and food chemistry (2019)
Analyzing an in vitro gastroduodenal digest of whey proteins by high-performance liquid chromatography (HPLC) coupled to high-resolution/high-sensitivity tandem mass spectrometry (MS/MS), we sought to evaluate if state-of-art peptidomics provide comprehensive peptide coverage of food "digestomes". A multitude of small-sized peptides derived from both α-lactalbumin and β-lactoglobulin as well as disulfide cross-linked hetero-oligomers remained unassigned, even when the digests were compared before and after S-S reduction. The precipitation with 12% trichloroacetic acid demonstrated the occurrence of large-sized polypeptides that escaped the bioinformatic identification. The analysis of a HPLC-MS/MS run with different proteomic search engines generated dissimilar peptide subsets, thus emphasizing the demand of refined searching algorithms. Although the MS/MS fragmentation of monocharged ions with exclusion of non-peptide-interfering compounds enlarged the inventory of short peptides, the overall picture of the "digestome" was still incomplete. These findings raise relevant implications for the identification of possible food-derived bioactive peptides or allergenic determinants.
Keyphrases
- high performance liquid chromatography
- tandem mass spectrometry
- ms ms
- ultra high performance liquid chromatography
- simultaneous determination
- liquid chromatography
- high resolution
- solid phase extraction
- mass spectrometry
- liquid chromatography tandem mass spectrometry
- gas chromatography
- risk assessment
- amino acid
- human health
- machine learning
- peripheral blood
- deep learning
- health insurance
- quantum dots