Current Electrospray Mass Spectrometry: An Overview. Part<scp>B</scp>. Analyte Charging
Bibliographic record
Abstract
Electrospray ionization (ESI) is an atomization and ionization method through which a solution‐phase analyte can be transferred into the gas‐phase as an ion via minute charged droplets. The second part of this two‐part review on electrospray mass spectrometry reviews the final part of the charged droplet trajectory and covers transfer into the gas‐phase and ionization of the analyte. The now customary separation into the ion evaporation model (for small analytes) and the charged residue model (for large analytes) is followed and reviewed. These models yield insight into the charging process, but observations made with newer atomization techniques and quantitation limitations imposed by ionization suppression (matrix effect) indicate that a complete understanding is not available yet. Deviations from expected charged residue or ion evaporation behavior will be indicated. Chemical and charge‐driven surfactancy is discussed in relation to small analyte ionization and quantitation, whereas hydration and kinetic trapping of protein conformers are treated as part of the charged residue model.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.003 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.005 | 0.007 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.036 | 0.065 |
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 source (direct Gemma or distilled Codex), 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".