Kinetics and mechanism of the oxidation of disaccharides by Cr<sup>VI</sup>
Why this work is in the frame
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Bibliographic record
Abstract
The oxidation of D-lactose, D-maltose, D-melibiose, and D-cellobiose by Cr VI yields the corresponding aldobionic acid and Cr 3+ as final products when an excess of reducing disaccharide over Cr VI is used. The rate law for the Cr VI oxidation reaction is expressed by d[Cr VI ]/dt = k H [disaccharide][Cr VI ], where the second-order kinetic constant, k H , depends on [H + ]. The relative reactivity of the disaccharides with Cr VI is expressed as follows: Mel > Lac > Cel > Mal, at 33°C. In acid medium, intermediate Cr V forms and reacts with the substrate faster than Cr VI . The EPR spectra show that five- and six-coordinate oxo-Cr V intermediates are formed, with the disaccharide acting as bidentate ligand. Five-coordinate oxo-Cr V species are present at any [H + ], whereas six-coordinate ones are observed only at pH < 2, where they rapidly decompose to the redox products. In the pH 37 range, where hexa-coordinate oxo-Cr V species are not observed, Cr V complexes are stable enough to remain in solution from several days to several months.Key words: chromium, saccharides, kinetics, EPR.
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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) | 0.001 | 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 it