On the Role of 1-Hydroxybenzotriazole as Mediator in Laccase Oxidation of Residual Kraft Lignin
Bibliographic record
Abstract
In order to elucidate the role of the mediator 1-hydroxybenzotriazole (HBT) in laccase oxidation processes, vanillyl alcohol was oxidized with laccase in the presence and in the absence of this mediator. The pattern of metabolites produced showed that the presence of HBT allowed the formation of oxygen addition products such as o - and p -quinones and aromatic ring cleavage products, while in its absence only oxidative coupling products were observed. Experiments carried out on residual kraft lignin showed the occurrence of coupling reactions during laccase oxidation. In the presence of the laccase-mediator (LM) system the reaction pathway was driven toward side chain oxidation and oxygen addition products, while the formation of condensed structures was depressed, Furthermore, The role of phenolic, aliphatic OH, and COOH moieties in lignin degradation was elucidated by selectively blocking them and then submitting the samples to laccase and laccase-HBT treatments. It was found that the activity of the LM system depends on the presence of phenolic lignin subunits. In actual fact, the reactions carried out on lignins lacking free phenolic groups did not cause any appreciable degradation to the polymer.
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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".