Strong Association between Proanthocyanidins and Polysaccharides in the Cell Walls of Western Redcedar Bark
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide The co-occurrence of polysaccharides and proanthocyanidins in the aqueous extracts of western redcedar ( Thuja plicata Donn; WRC) bark limits their commercial utilization. To better understand their association, proanthocyanidins and polysaccharides were extracted with cold water (3.4% w/w bark) and isolated as an alcohol-insoluble residue (AIR, 1.0% w/w bark). The polysaccharide content (∼30% w/w AIR) was analyzed by acidic and enzymatic depolymerization, revealing the presence of pectins, xyloglucans, and xylans. NMR spectroscopy identified features, such as acetylation and methyl esterification. Thiolysis followed by HPLC-DAD revealed that proanthocyanidins (1.46% w/w AIR) exhibit a mean degree of polymerization of 5.3, a cis / trans ratio of 0.40, and a procyanidin/prodelphinidin ratio of 3.90. This study provides a detailed structural characterization of proanthocyanidins and polysaccharides in the AIR of WRC bark. The findings highlight their strong association, which may contribute to distinctive properties that warrant further exploration, particularly in efforts to valorize bark residues.
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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".