Interaction of Flavanols with Amino Acids: Postoxidative Reactivity of the B-Ring of Catechin with Glycine
Bibliographic record
Abstract
Flavanol-related structures such as epicatechin and catechins have been associated with potential antioxidant activity in food and are known to interfere with the Maillard reaction through scavenging of reactive dicarbonyl compounds. High-resolution ESI-TOF mass spectrometry and an isotope labeling technique were used to assess the reactivity of glycine with (+)-catechin heated under oxidative conditions at 120 °C for 70 min. Evidence based on accurate mass analysis of the products obtained and the isotope incorporation pattern of [(13)C-1]glycine, [(13)C-2]glycine, and [(15)N]glycine experiments indicated that (+)-catechin formed various adducts with glycine; two of them incorporated a single amino acid, and three adducts incorporated two amino acid moieties. Some of these adducts underwent dehydration reaction at ring C, and in some the C-ring remained intact. Detailed MS/MS analyses of the fragmentation patterns of these adducts have confirmed the addition of amino acid moieties to the oxidized B-ring of (+)-catechin through the formation of Schiff bases. Formation of such nonvolatile (+)-catechin/amino acid adducts provides insight into how amino acid can have the potential of modifying the antioxidant properties of (+)-catechin and how catechin in turn has the potential of modifying the profile of the Maillard reaction.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".