Determination of the contents of two coumarins in Angelica dahurica from different regions by HPLC
Bibliographic record
Abstract
Objective To determine the contents of two coumarins in Angelica dahurica from different regions by HPLC.Methods A ULTRON VX-ODS column(4.6 mm×250 mm,5 μm)was used with the mobile phase consisting of acetonitrile-water (V/∶V=65∶35,).The flow rate was 0.8 mL·min -1, and the detection wavelength was set at 249 nm.Results The linear ranges of imperatorin and isoimperatorin were 5～50 mg·L -1 (correlation coefficient r= 0.999 8) and 2～20 mg·L -1 (correlation coefficient r= 0.999 9),respectively.The average recoveries of imperatorin and isoimperatorin were 98.4%(RSD=1.2%) and 96.3% (RSD=1.7%), respectively.Conclusion There are great differences in the contents of two coumarines in Angelica dahurica from different regions.And the contents of two coumarines can provide a basis for the quality assessment for Angelica dahurica from different regions.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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 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".