Preparation of hypericin enriched St. John's wort extracts
Bibliographic record
Abstract
Results of solid phase extraction (SPE) of St. John' s Wort extracts were described. In order to obtain the extract the air-dried plant material of Hypericum perforatum L. (cultivar Yantar) grown in the Central Botanical Garden of NAS of Belarus was used. Analysis of the St. John's wort extract solutions was carried out by electronic absorption spectroscopy. It was shown the influence of the nature of the solvent on the spectral characteristics of the ex tract. The sorbent Waters Sep-Pak S18®Vac RC was used for solid-phase extraction. The methanol solutions of different concentrations were used as an eluent system. For SPE metanol fractions absorption and fluorescence spectra were registered. It is shown that the main part of hypericin was eluted with 80% methanol. The values of quantum yields were calculated. These results suggest that solid phase extraction on the non-polar sorbent is a promising way to increase the content of the hypericin in the St. John's Wort extracts.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.001 | 0.003 |
| Scholarly communication | 0.000 | 0.002 |
| Open science | 0.004 | 0.002 |
| Research integrity | 0.001 | 0.002 |
| 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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
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".