1. Novel Approach for Simultaneous Analysis of Peptide Metabolites from Orally Administered Glycinin in Rat Bloodstream by Coumarin-Tagged MALDI–MS
- Author
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Satoshi Nagaoka, Risa Katagihara, Mitsuru Tanaka, Marika Hashimoto, Xiaojing Sheng, and Toshiro Matsui
- Subjects
chemistry.chemical_classification ,Maldi ms ,Chromatography ,Metabolite ,Globulins ,Peptide ,General Chemistry ,Coumarin ,Mass spectrometry ,Rats ,Rats, Sprague-Dawley ,chemistry.chemical_compound ,chemistry ,Coumarins ,Oral administration ,Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization ,Soybean Proteins ,Animals ,Amine gas treating ,Peptides ,General Agricultural and Biological Sciences ,Derivatization - Abstract
The lack of an appropriate analytical approach characterizing metabolites from dietary proteins may prevent further studies that could clarify their health benefits. In this study, we attempted to establish a novel analytical assay of peptide metabolites from glycinin using matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS), in combination with the amine derivatization technique with coumarin (Cou). Cou (30 mmol/L) derivatization of peptides under rapid (30 min) and mild (25 °C, pH 8.5) conditions caused higher MS detection of the peptides as compared to nonderivatized peptides. In addition, an MS shift of the target by Cou derivatization (+202.0 m/z) can help to easily discriminate peptide metabolites in glycinin-administered blood, by comparing the MALDI-MS spectra of Cou-derivatized plasma with those of preadministered blood. After the oral administration of glycinin (100 mg/kg) to Sprague-Dawley rats, 15 di- to tetrapeptides were successfully characterized as glycinin-derived metabolites, demonstrating that the proposed Cou-tagged MALDI-MS is an appropriate characterization technique for peptide metabolites.
- Published
- 2021