Method for Investigation of Oligosaccharides Using Phenylhydrazine Derivatization
Bibliographic record
Abstract
The reaction of carbohydrates with phenylhydrazine provides corresponding phenylhydrazone derivatives, yielding increased sensitivity for mass spectrometry (MS) and ultraviolet (UV) detection during high-performance liquid chromatography (HPLC) separation. After a simple derivatization procedure, 1 h of incubation at 37-70 degrees C, the samples can be analyzed by mass spectrometry techniques or with a combination of MS with HPLC using electrospray (ESI). Another useful aspect of this tagging is shown in the direct determination of glycosylation sites in proteins. Reaction conditions have enabled visualization of glycans next to their "mother peptides", that are otherwise usually not detectable because of suppression by abundant molecular ions of deglycosylated peptides.We have shown that oligosaccharides as phenylhydrazone derivatives under MALDI-tandem mass spectrometry (MS/MS) and post-source decay (PSD) conditions provide very useful data for the structural elucidation of saccharides, including assignment of dominant isomers. Sialylated oligosaccharides also produce B, C fragment ions and cross-ring cleavage fragments comprising sialic acid.
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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) | 0.001 | 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".